BlackTreeIndependent security intelligence
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Full vulnerability report · 2020
CVE-2020-8285High confidence

curl 7.21.0 to and including 7.73.0 is vulnerable to uncontrolled recursion due to a stack overflow issue in FTP wildcard match parsing

n/a · https://github.com/curl/curl

7.5HighCVSS 3.1
Recommended action
Within 7 days

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
Direct vendor intelligence

Authoritative 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.

2 current
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
5 known affected

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 7.21.0 to and including 7.73.0 is vulnerable to uncontrolled recursion due to a stack overflow issue in FTP wildcard match parsing.
Remediation
Update to V3.1.5 or later version
SSA-389290 · CSAF 2.0 · revision 1 · finalSiemens ProductCERTSSA-389290: Third-Party Component Vulnerabilities in SINEC INS
1 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • SINEC INS
Summary
curl 7.21.0 to and including 7.73.0 is vulnerable to uncontrolled recursion due to a stack overflow issue in FTP wildcard match parsing.
Remediation
Update to V1.0.1.1 or later version
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2020-29153

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

curl 7.21.0 to and including 7.73.0 is vulnerable to uncontrolled recursion due to a stack overflow issue in FTP wildcard match parsing.

What

curl 7.21.0 to and including 7.73.0 is vulnerable to uncontrolled recursion due to a stack overflow issue in FTP wildcard match parsing.

Why

The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.

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

curl 7.21.0 to and including 7.73.0 is vulnerable to uncontrolled recursion due to a stack overflow issue in FTP wildcard match parsing.

Why

The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.

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
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

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
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

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 → Uncontrolled Recursion → 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-674 ↗

CWE-674: Uncontrolled Recursion. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.

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:N/I:N/A:H

Common 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.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.
NetworkUnauthenticatedCWE-674Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

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Official advisory
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Official advisory
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Official advisory
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Official advisory
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Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in cURL ausnutzen, um Informationen offenzulegen, einen Denial of Service zu verursachen oder Sicherheitsvorkehrungen zu umgehen.

Official advisory
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Official advisory
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org/CVERecord?id=CVE-2020-36228 Référence CVE CVE-2020-36229 https://www.cve.org/CVERecord?id=CVE-2020-36229 Référence CVE CVE-2020-36230 https://www.cve.org/CVERecord?id=CVE-2020-36230 Référence CVE CVE-2020-6096 https://www.cve.org/CVERecord?id=CVE-2020-6096 Référence CVE CVE-2020-7595 https://www.cve.org/CVERecord?id=CVE-2020-7595 Référence CVE CVE-2020-8169 https://www.cve.org/CVERecord?id=CVE-2020-8169 Référence CVE CVE-2020-8177 https://www.cve.org/CVERecord?id=CVE-2020-8177 Référence CVE CVE-2020-8231 https://www.cve.org/CVERecord?id=CVE-2020-8231 Référence CVE CVE-2020-8284 https://www.cve.org/CVERecord?id=CVE-2020-8284 Référence CVE CVE-2020-8285 https://www.cve.org/CVERecord?id=CVE-2020-8285 Référence CVE CVE-2020-8286 https://www.cve.org/CVERecord?id=CVE-2020-8286 Référence CVE CVE-2020-8315 https://www.cve.org/CVERecord?id=CVE-2020-8315 Référence CVE CVE-2020-8492 https://www.cve.org/CVERecord?id=CVE-2020-8492 Référence CVE CVE-2020-9327 https://www.cve.org/CVERecord?id=CVE-2020-9327 Référence CVE CVE-2021-20193 https://www.cve.org/CVERecord?id=CVE-2021-20193 Référence CVE CVE-2021-20227 https://www.cve.org/CVERecord?id=CVE-2021-20227 Référence CVE CVE-2021-20231 https://www.cve.org/CVERecord?id=CVE-2021-20231 Référence CVE CVE-2021-20232 https://www.cve.org/CVERecord?id=CVE-2021-

Official advisory
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Official advisory
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Official advisory
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Official advisory
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Official advisory
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Official advisory
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Official advisory
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avril 2021 https://support.apple.com/fr-fr/HT212324 Bulletin de sécurité Apple HT212325 du 26 avril 2021 https://support.apple.com/fr-fr/HT212325 Bulletin de sécurité Apple HT212326 du 26 avril 2021 https://support.apple.com/fr-fr/HT212326 Bulletin de sécurité Apple HT212327 du 26 avril 2021 https://support.apple.com/fr-fr/HT212327 Référence CVE CVE-2020-27942 https://www.cve.org/CVERecord?id=CVE-2020-27942 Référence CVE CVE-2020-3838 https://www.cve.org/CVERecord?id=CVE-2020-3838 Référence CVE CVE-2020-7463 https://www.cve.org/CVERecord?id=CVE-2020-7463 Référence CVE CVE-2020-8037 https://www.cve.org/CVERecord?id=CVE-2020-8037 Référence CVE CVE-2020-8285 https://www.cve.org/CVERecord?id=CVE-2020-8285 Référence CVE CVE-2020-8286 https://www.cve.org/CVERecord?id=CVE-2020-8286 Référence CVE CVE-2021-1739 https://www.cve.org/CVERecord?id=CVE-2021-1739 Référence CVE CVE-2021-1740 https://www.cve.org/CVERecord?id=CVE-2021-1740 Référence CVE CVE-2021-1784 https://www.cve.org/CVERecord?id=CVE-2021-1784 Référence CVE CVE-2021-1797 https://www.cve.org/CVERecord?id=CVE-2021-1797 Référence CVE CVE-2021-1805 https://www.cve.org/CVERecord?id=CVE-2021-1805 Référence CVE CVE-2021-1806 https://www.cve.org/CVERecord?id=CVE-2021-1806 Référence CVE CVE-2021-1807 https://www.cve.org/CVERecord?id=CVE-2021-1807 Ré

Official advisory
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
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)
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.
Action
Update to V3.1.5 or later version
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 Dec 2020 · Last source change 16 Apr 2026, 14:07 UTC · CWE-674 · Uncontrolled Recursion

CVE recordCVE.org · 5.2
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2020-29153
Product sourceVendor CSAF · Siemens ProductCERT
Remediation sourceVendor CSAF · Siemens ProductCERT
CWE sourceCNA
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2020-29153↗Vendor CSAF · Siemens ProductCERT↗CISA Vulnrichment SSVC evidence↗Vendor advisory↗Patch or update reference↗Patch or update reference↗Patch or update reference↗CVE authority or vendor reference↗Public exploit reference↗Official CVE record (CNA and ADP data)↗
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.
Free version - for non-commercial use only.CVE-2020-8285 · cve.blacktree.nl