Evidence used
- No CISA KEV confirmation is currently recorded.
- A structured source references public exploit or proof-of-concept material.
- EPSS is 33.10% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2022
CVE-2022-32206High confidence
n/a https://github.com/curl/curl — Allocation of Resources Without Limits or Throttling
Unknown · https://github.com/curl/curl
Official source article: Siemens SSA-398330 ↗. Check the applicable product and release in the original source.
6.5MediumCVSS 3.1
Patch only the product branches with a verified fix
Fix availability varies by productMedium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 33 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityMedium→Operational priority:High, raised one band.upgradedsince 5 May 2025
Compensating controls
- Validate the affected product branch and deploy the verified fixed release.
- Restrict the affected network interface to trusted sources where business-safe.
- Increase monitoring for the attack path and post-exploitation behaviour described in the report.
Verification
- Confirm that the asset runs Unknown https://github.com/curl/curl and falls inside the recorded affected range.
- Verify the installed build against the product-specific fixed version after deployment.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Remediation availability differs by product scope
Verified remediation exists for at least one product or source, but 33 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
- Siemens ProductCERT: 5 affected or under-investigation product states without a fixed product state in the same current advisory
- Siemens ProductCERT: 1 affected or under-investigation product state without a fixed product state in the same current advisory
- Siemens ProductCERT: 1 affected or under-investigation product state without a fixed product state in the same current advisory
- Siemens ProductCERT: 20 affected or under-investigation product states without a fixed product state in the same current advisory
- Siemens ProductCERT: 6 affected or under-investigation product states without a fixed product state in the same current advisory
Distribution package intelligence
7 package statesRelease-specific package status
Alpine, Debian findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.
Repository candidate not checked
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
| Distribution release | Source package | Vendor state | Fixed version | Evidence |
|---|---|---|---|---|
| Alpine v3.23v3.23 · main | curl | Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected. | 7.84.0-r0 | Alpine Security Database ↗Source updated 3 Oct 2026 |
| Alpine v3.22v3.22 · main | curl | Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected. | 7.84.0-r0 | Alpine Security Database ↗Source updated 3 Oct 2026 |
| Alpine v3.21v3.21 · main | curl | Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected. | 7.84.0-r0 | Alpine Security Database ↗Source updated 3 Oct 2026 |
| Debian trixietrixie · source | curl | Vendor fix publishedDebian records a fixed source-package version for this release. | 7.84.0-1 | Debian Security Tracker ↗Source updated 5 Oct 2026 |
| Debian bookwormbookworm · source | curl | Vendor fix publishedDebian records a fixed source-package version for this release. | 7.84.0-1 | Debian Security Tracker ↗Source updated 5 Oct 2026 |
| Debian forkyforky · source | curl | Vendor fix publishedDebian records a fixed source-package version for this release. | 7.84.0-1 | Debian Security Tracker ↗Source updated 5 Oct 2026 |
| Debian sidsid · source | curl | Vendor fix publishedDebian records a fixed source-package version for this release. | 7.84.0-1 | Debian Security Tracker ↗Source updated 5 Oct 2026 |
Direct vendor intelligence
6 currentAuthoritative vendor CSAF and VEX advisories
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
CVE-2022-32206 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitycurl: HTTP compression denial of service
The vendor explicitly identifies these products as affected by this CVE.
- rh-dotnet31-curl as a component of .NET Core 3.1 on Red Hat Enterprise Linux
- rh-dotnet31-curl.src as a component of .NET Core 3.1 on Red Hat Enterprise Linux
- rh-dotnet31-libcurl as a component of .NET Core 3.1 on Red Hat Enterprise Linux
- rh-dotnet31-libcurl-devel as a component of .NET Core 3.1 on Red Hat Enterprise Linux
- httpd24-curl as a component of Red Hat Software Collections
- httpd24-curl.src as a component of Red Hat Software Collections
- httpd24-libcurl as a component of Red Hat Software Collections
- httpd24-libcurl-devel as a component of Red Hat Software Collections
- Summary
- A vulnerability was found in curl. This issue occurs because the number of acceptable "links" in the "decompression chain" was unbounded, allowing a malicious server to insert a virtually unlimited number of compression steps. This flaw leads to a denial of service, either by mistake or by a malicious actor.
- Remediation
- For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Applications using the APR libraries, such as httpd, must be restarted for this update to take effect. After installing the updated packages, the httpd daemon will be restarted automatically.
SSA-398330 · CSAF 2.0 · revision 18 · interimSiemens ProductCERTSSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5
The vendor explicitly identifies these products as affected by this CVE.
- SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
- SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)
- SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)
- SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)
- SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)
- Summary
- curl < 7.84.0 supports "chained" HTTP compression algorithms, meaning that a serverresponse can be compressed multiple times and potentially with different algorithms. The number of acceptable "links" in this "decompression chain" was unbounded, allowing a malicious server to insert a virtually unlimited number of compression steps.The use of such a decompression chain could result in a "malloc bomb", makingcurl end up spending enormous amounts of allocated heap memory, or trying toand returning out of memory errors.
- Remediation
- Update to V3.1.5 or later version
SSA-942865 · CSAF 2.0 · revision 2 · finalSiemens ProductCERTSSA-942865: Multiple Vulnerabilities in the Integrated SCALANCE S615 of SINAMICS Medium Voltage Products
The vendor explicitly identifies these products as affected by this CVE.
- SINAMICS PERFECT HARMONY GH180 6SR5
- Summary
- curl < 7.84.0 supports "chained" HTTP compression algorithms, meaning that a serverresponse can be compressed multiple times and potentially with different algorithms. The number of acceptable "links" in this "decompression chain" was unbounded, allowing a malicious server to insert a virtually unlimited number of compression steps.The use of such a decompression chain could result in a "malloc bomb", makingcurl end up spending enormous amounts of allocated heap memory, or trying toand returning out of memory errors.
- Remediation
- Update the firmware of the integrated SCALANCE S615 device to V7.2 or later version
SSA-558014 · CSAF 2.0 · revision 1 · interimSiemens ProductCERTSSA-558014: Third-Party Component Vulnerabilities in SCALANCE XCM332 before V2.2
The vendor explicitly identifies these products as affected by this CVE.
- SCALANCE XCM332 (6GK5332-0GA01-2AC2)
- Summary
- curl < 7.84.0 supports "chained" HTTP compression algorithms, meaning that a serverresponse can be compressed multiple times and potentially with different algorithms. The number of acceptable "links" in this "decompression chain" was unbounded, allowing a malicious server to insert a virtually unlimited number of compression steps.The use of such a decompression chain could result in a "malloc bomb", makingcurl end up spending enormous amounts of allocated heap memory, or trying toand returning out of memory errors.
- Remediation
- Update to V2.2 or later version
SSA-419740 · CSAF 2.0 · revision 1 · finalSiemens ProductCERTSSA-419740: Multiple Third-Party Component Vulnerabilities in RUGGEDCOM and SCALANCE Products before V7.2
The vendor explicitly identifies these products as affected by this CVE.
- RUGGEDCOM RM1224 LTE(4G) EU (6GK6108-4AM00-2BA2)
- RUGGEDCOM RM1224 LTE(4G) NAM (6GK6108-4AM00-2DA2)
- SCALANCE M804PB (6GK5804-0AP00-2AA2)
- SCALANCE M812-1 ADSL-Router (Annex A) (6GK5812-1AA00-2AA2)
- SCALANCE M812-1 ADSL-Router (Annex B) (6GK5812-1BA00-2AA2)
- SCALANCE M816-1 ADSL-Router (Annex A) (6GK5816-1AA00-2AA2)
- SCALANCE M816-1 ADSL-Router (Annex B) (6GK5816-1BA00-2AA2)
- SCALANCE M826-2 SHDSL-Router (6GK5826-2AB00-2AB2)
- SCALANCE M874-2 (6GK5874-2AA00-2AA2)
- SCALANCE M874-3 (6GK5874-3AA00-2AA2)
- SCALANCE M876-3 (EVDO) (6GK5876-3AA02-2BA2)
- SCALANCE M876-3 (ROK) (6GK5876-3AA02-2EA2)
- Summary
- curl < 7.84.0 supports "chained" HTTP compression algorithms, meaning that a serverresponse can be compressed multiple times and potentially with different algorithms. The number of acceptable "links" in this "decompression chain" was unbounded, allowing a malicious server to insert a virtually unlimited number of compression steps.The use of such a decompression chain could result in a "malloc bomb", makingcurl end up spending enormous amounts of allocated heap memory, or trying toand returning out of memory errors.
- Remediation
- Update to V7.2 or later version
SSA-333517 · CSAF 2.0 · revision 1 · finalSiemens ProductCERTSSA-333517: Multiple Vulnerabilities in SCALANCE SC-600 Family before V3.0
The vendor explicitly identifies these products as affected by this CVE.
- SCALANCE SC622-2C (6GK5622-2GS00-2AC2)
- SCALANCE SC626-2C (6GK5626-2GS00-2AC2)
- SCALANCE SC632-2C (6GK5632-2GS00-2AC2)
- SCALANCE SC636-2C (6GK5636-2GS00-2AC2)
- SCALANCE SC642-2C (6GK5642-2GS00-2AC2)
- SCALANCE SC646-2C (6GK5646-2GS00-2AC2)
- Summary
- curl < 7.84.0 supports "chained" HTTP compression algorithms, meaning that a serverresponse can be compressed multiple times and potentially with different algorithms. The number of acceptable "links" in this "decompression chain" was unbounded, allowing a malicious server to insert a virtually unlimited number of compression steps.The use of such a decompression chain could result in a "malloc bomb", makingcurl end up spending enormous amounts of allocated heap memory, or trying toand returning out of memory errors.
- Remediation
- Update to V3.0 or later version
Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 33 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
Fix availability varies by product01
What, why and how
curl < 7.84.0 supports "chained" HTTP compression algorithms, meaning that a serverresponse can be compressed multiple times and potentially with different algorithms. The number of acceptable "links" in this "decompression chain" was unbounded, allowing a malicious server to insert a virtually unlimited number of compression steps.The use of such a decompression chain could result in a "malloc bomb", makingcurl end up spending enormous amounts of allocated heap memory, or trying toand returning out of memory errors.
What
curl < 7.84.0 supports "chained" HTTP compression algorithms, meaning that a serverresponse can be compressed multiple times and potentially with different algorithms. The number of acceptable "links" in this "decompression chain" was unbounded, allowing a malicious server to insert a virtually unlimited number of compression steps.The use of such a decompression chain could result in a "malloc bomb", makingcurl end up spending enormous amounts of allocated heap memory, or trying toand returning out of memory errors.
Why
The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
How
An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
What
curl < 7.84.0 supports "chained" HTTP compression algorithms, meaning that a serverresponse can be compressed multiple times and potentially with different algorithms. The number of acceptable "links" in this "decompression chain" was unbounded, allowing a malicious server to insert a virtually unlimited number of compression steps.The use of such a decompression chain could result in a "malloc bomb", makingcurl end up spending enormous amounts of allocated heap memory, or trying toand returning out of memory errors.
Why
The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
How
An attacker operating through a network path may attempt exploitation without authentication after a user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material Reference recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.
- Likely attack path
- a network path → Allocation of Resources Without Limits or Throttling → cause the confidentiality, integrity or availability impact described by the vendor
- Attack surface
- Network
- Privileges required
- None: unauthenticated exploitation is possible
- User interaction
- Required interaction required
- Attack complexity
- Low: no specialised conditions are recorded
- Security boundary
- Unchanged: impact remains within the vulnerable component's security authority
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-770 ↗
CWE-770: Allocation of Resources Without Limits or Throttling. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HCommon Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.- Post-exploitation / living off the land
- No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Fix availability varies by product
- Affected
- rh-dotnet31-curl as a component of .NET Core 3.1 on Red Hat Enterprise Linux
- rh-dotnet31-curl.src as a component of .NET Core 3.1 on Red Hat Enterprise Linux
- rh-dotnet31-libcurl as a component of .NET Core 3.1 on Red Hat Enterprise Linux
- rh-dotnet31-libcurl-devel as a component of .NET Core 3.1 on Red Hat Enterprise Linux
- httpd24-curl as a component of Red Hat Software Collections
- httpd24-curl.src as a component of Red Hat Software Collections
- httpd24-libcurl as a component of Red Hat Software Collections
- httpd24-libcurl-devel as a component of Red Hat Software Collections
- Fixed
- jbcs-httpd24-curl-0:7.86.0-2.el7jbcs.src as a component of Red Hat JBoss Core Services on RHEL 7 Server
- jbcs-httpd24-curl-0:7.86.0-2.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
- jbcs-httpd24-curl-debuginfo-0:7.86.0-2.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
- jbcs-httpd24-libcurl-0:7.86.0-2.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
- jbcs-httpd24-libcurl-devel-0:7.86.0-2.el7jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 7 Server
- jbcs-httpd24-curl-0:7.86.0-2.el8jbcs.src as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-curl-0:7.86.0-2.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-curl-debuginfo-0:7.86.0-2.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-libcurl-0:7.86.0-2.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-libcurl-debuginfo-0:7.86.0-2.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- jbcs-httpd24-libcurl-devel-0:7.86.0-2.el8jbcs.x86_64 as a component of Red Hat JBoss Core Services on RHEL 8
- curl-debuginfo-0:7.76.1-14.el9_0.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
- curl-debuginfo-0:7.76.1-14.el9_0.5.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9)
- curl-debuginfo-0:7.76.1-14.el9_0.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
- curl-debuginfo-0:7.76.1-14.el9_0.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
- curl-debuginfo-0:7.76.1-14.el9_0.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
- curl-debugsource-0:7.76.1-14.el9_0.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
- curl-debugsource-0:7.76.1-14.el9_0.5.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9)
- curl-debugsource-0:7.76.1-14.el9_0.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
- curl-debugsource-0:7.76.1-14.el9_0.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
- curl-debugsource-0:7.76.1-14.el9_0.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
- curl-minimal-debuginfo-0:7.76.1-14.el9_0.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
- curl-minimal-debuginfo-0:7.76.1-14.el9_0.5.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9)
- curl-minimal-debuginfo-0:7.76.1-14.el9_0.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
- curl-minimal-debuginfo-0:7.76.1-14.el9_0.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
- curl-minimal-debuginfo-0:7.76.1-14.el9_0.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
- libcurl-debuginfo-0:7.76.1-14.el9_0.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
- libcurl-debuginfo-0:7.76.1-14.el9_0.5.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9)
- libcurl-debuginfo-0:7.76.1-14.el9_0.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
- libcurl-debuginfo-0:7.76.1-14.el9_0.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
- and 181 more
- Action
- Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
- Workaround
- No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04
Evidence and provenance
Published 7 Jul 2022 · Last source change 5 May 2025, 16:16 UTC · CWE-770 · Allocation of Resources Without Limits or Throttling
CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
EPSS source FIRST · tracked since 2026-08-14
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2022-53412
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD modified after enrichment
Missing structured fields: affected product. Missing data is not evidence of low risk; review the primary advisory.
Material change intelligence
View recent updates ↗What changed after publication
- Affected versionsThe structured affected or fixed version information changed.Siemens ProductCERT ↗
- Before
- Fixed in 7.84.0 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
- After
- Fixed in 7.84.0 · Fixed: Update to V3.1.5 or later version
CVE published
Fixed release or patch reference recorded
Fixed release recorded from official guidance
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.