Evidence used
- No CISA KEV confirmation is currently recorded.
- The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
- EPSS is 28.19% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2022
CVE-2022-22720High confidence
HTTP request smuggling vulnerability in Apache HTTP Server 2.4.52 and earlier
Apache Software Foundation · Apache HTTP Server
9.8CriticalCVSS 3.1
Within 72 hours
Patch availableCritical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityCritical→Operational priority:Critical, unchanged from published severity.unchanged
Compensating controls
- Validate the affected product branch and deploy the verified fixed release.
- Restrict the affected network interface to trusted sources where business-safe.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs Apache Software Foundation Apache HTTP Server 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.
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 | apache2 | Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected. | 2.4.53-r0 | Alpine Security Database ↗Source updated 3 Oct 2026 |
| Alpine v3.22v3.22 · main | apache2 | Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected. | 2.4.53-r0 | Alpine Security Database ↗Source updated 3 Oct 2026 |
| Alpine v3.21v3.21 · main | apache2 | Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected. | 2.4.53-r0 | Alpine Security Database ↗Source updated 3 Oct 2026 |
| Debian trixietrixie · source | apache2 | Vendor fix publishedDebian records a fixed source-package version for this release. | 2.4.53-1 | Debian Security Tracker ↗Source updated 5 Oct 2026 |
| Debian bookwormbookworm · source | apache2 | Vendor fix publishedDebian records a fixed source-package version for this release. | 2.4.53-1 | Debian Security Tracker ↗Source updated 5 Oct 2026 |
| Debian forkyforky · source | apache2 | Vendor fix publishedDebian records a fixed source-package version for this release. | 2.4.53-1 | Debian Security Tracker ↗Source updated 5 Oct 2026 |
| Debian sidsid · source | apache2 | Vendor fix publishedDebian records a fixed source-package version for this release. | 2.4.53-1 | Debian Security Tracker ↗Source updated 5 Oct 2026 |
Direct vendor intelligence
1 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-2022-22720 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityhttpd: Errors encountered during the discarding of request body lead to HTTP request smuggling
The vendor explicitly identifies these products as affected by this CVE.
- httpd as a component of Red Hat JBoss Enterprise Application Platform 6
- httpd-devel as a component of Red Hat JBoss Enterprise Application Platform 6
- httpd-manual as a component of Red Hat JBoss Enterprise Application Platform 6
- httpd-tools as a component of Red Hat JBoss Enterprise Application Platform 6
- httpd.src as a component of Red Hat JBoss Enterprise Application Platform 6
- mod_ldap as a component of Red Hat JBoss Enterprise Application Platform 6
- mod_ssl as a component of Red Hat JBoss Enterprise Application Platform 6
- Summary
- A flaw was found in httpd. The inbound connection is not closed when it fails to discard the request body, which may expose the server to HTTP request smuggling.
- 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 After installing the updated packages, the httpd daemon will be restarted automatically.
Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.
Patch available01
What, why and how
Apache HTTP Server 2.4.52 and earlier fails to close inbound connection when errors are encountered discarding the request body, exposing the server to HTTP Request Smuggling
What
Apache HTTP Server 2.4.52 and earlier fails to close inbound connection when errors are encountered discarding the request body, exposing the server to HTTP Request Smuggling
Why
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
What
Apache HTTP Server 2.4.52 and earlier fails to close inbound connection when errors are encountered discarding the request body, exposing the server to HTTP Request Smuggling
Why
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
How
An attacker operating through a network path may attempt exploitation without authentication or 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 None recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
- Likely attack path
- a network path → Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') → cause the confidentiality, integrity or availability impact described by the vendor
- Attack surface
- Network
- Privileges required
- None: unauthenticated exploitation is possible
- User interaction
- None
- 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-444 ↗
CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'). The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
- 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:N/S:U/C:H/I:H/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.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.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. - Patch available
- Affected
- httpd as a component of Red Hat JBoss Enterprise Application Platform 6
- httpd-devel as a component of Red Hat JBoss Enterprise Application Platform 6
- httpd-manual as a component of Red Hat JBoss Enterprise Application Platform 6
- httpd-tools as a component of Red Hat JBoss Enterprise Application Platform 6
- httpd.src as a component of Red Hat JBoss Enterprise Application Platform 6
- mod_ldap as a component of Red Hat JBoss Enterprise Application Platform 6
- mod_ssl as a component of Red Hat JBoss Enterprise Application Platform 6
- Fixed
- httpd-0:2.2.15-70.el6_10.i686 as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- httpd-0:2.2.15-70.el6_10.s390x as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- httpd-0:2.2.15-70.el6_10.src as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- httpd-0:2.2.15-70.el6_10.x86_64 as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- httpd-debuginfo-0:2.2.15-70.el6_10.i686 as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- httpd-debuginfo-0:2.2.15-70.el6_10.s390 as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- httpd-debuginfo-0:2.2.15-70.el6_10.s390x as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- httpd-debuginfo-0:2.2.15-70.el6_10.x86_64 as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- httpd-devel-0:2.2.15-70.el6_10.i686 as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- httpd-devel-0:2.2.15-70.el6_10.s390 as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- httpd-devel-0:2.2.15-70.el6_10.s390x as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- httpd-devel-0:2.2.15-70.el6_10.x86_64 as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- httpd-manual-0:2.2.15-70.el6_10.noarch as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- httpd-tools-0:2.2.15-70.el6_10.i686 as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- httpd-tools-0:2.2.15-70.el6_10.s390x as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- httpd-tools-0:2.2.15-70.el6_10.x86_64 as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- mod_ssl-1:2.2.15-70.el6_10.i686 as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- mod_ssl-1:2.2.15-70.el6_10.s390x as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- mod_ssl-1:2.2.15-70.el6_10.x86_64 as a component of Red Hat Enterprise Linux Server (v. 6 ELS)
- httpd-0:2.4.6-97.el7_9.5.src as a component of Red Hat Enterprise Linux Client Optional (v. 7)
- httpd-0:2.4.6-97.el7_9.5.x86_64 as a component of Red Hat Enterprise Linux Client Optional (v. 7)
- httpd-debuginfo-0:2.4.6-97.el7_9.5.x86_64 as a component of Red Hat Enterprise Linux Client Optional (v. 7)
- httpd-devel-0:2.4.6-97.el7_9.5.x86_64 as a component of Red Hat Enterprise Linux Client Optional (v. 7)
- httpd-manual-0:2.4.6-97.el7_9.5.noarch as a component of Red Hat Enterprise Linux Client Optional (v. 7)
- httpd-tools-0:2.4.6-97.el7_9.5.x86_64 as a component of Red Hat Enterprise Linux Client Optional (v. 7)
- mod_ldap-0:2.4.6-97.el7_9.5.x86_64 as a component of Red Hat Enterprise Linux Client Optional (v. 7)
- mod_proxy_html-1:2.4.6-97.el7_9.5.x86_64 as a component of Red Hat Enterprise Linux Client Optional (v. 7)
- mod_session-0:2.4.6-97.el7_9.5.x86_64 as a component of Red Hat Enterprise Linux Client Optional (v. 7)
- mod_ssl-1:2.4.6-97.el7_9.5.x86_64 as a component of Red Hat Enterprise Linux Client Optional (v. 7)
- httpd-0:2.4.6-97.el7_9.5.src as a component of Red Hat Enterprise Linux ComputeNode Optional (v. 7)
- and 631 more
- Action
- For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the updated packages, the httpd daemon will be restarted automatically.
- 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 14 Mar 2022 · Last source change 3 Aug 2024, 03:21 UTC · CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
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-2022-27863
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD modified after enrichment
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- Affected versionsThe structured affected or fixed version information changed.Red Hat Product Security ↗
- Before
- Apache HTTP Server 2.4 ≤ 2.4.52 · 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
- Apache HTTP Server 2.4 ≤ 2.4.52 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the updated packages, the httpd daemon will be restarted automatically.
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.