BlackTreeIndependent security intelligence
← Back to the CVE catalogue
Full vulnerability report · 2020
CVE-2020-8231High confidence

Due to use of a dangling pointer, libcurl 7.29.0 through 7.71.1 can use the wrong connection when sending data

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
Due to use of a dangling pointer, libcurl 7.29.0 through 7.71.1 can use the wrong connection when sending data.
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
Due to use of a dangling pointer, libcurl 7.29.0 through 7.71.1 can use the wrong connection when sending data.
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-2020-29103

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

Due to use of a dangling pointer, libcurl 7.29.0 through 7.71.1 can use the wrong connection when sending data.

What

Due to use of a dangling pointer, libcurl 7.29.0 through 7.71.1 can use the wrong connection when sending data.

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

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

Due to use of a dangling pointer, libcurl 7.29.0 through 7.71.1 can use the wrong connection when sending data.

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

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 → Use After Free → 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-416 ↗

CWE-416: Use After Free. The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.

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:N/A:N

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.CHighConfidentiality impact: A successful attack can cause a major loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.
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-416Public exploit reference
A

Official authority intelligence

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

BSI · German · WID-SEC-W-2026-0180Dell Data Protection Advisor: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Dell Data Protection Advisor ausnutzen, um beliebigen Code auszuführen, einen Denial-of-Service-Zustand zu erzeugen, Sicherheitsmaßnahmen zu umgehen und nicht näher spezifizierte Angriffe zu starten.

Official advisory
BSI · German · WID-SEC-W-2023-2229Splunk Splunk Enterprise: Mehrere Schwachstellen

Ein entfernter, authentifizierter Angreifer kann mehrere Schwachstellen in Splunk Splunk Enterprise ausnutzen, um beliebigen Code auszuführen, einen 'Denial of Service'-Zustand zu verursachen, seine Privilegien zu erweitern und weitere, nicht spezifizierte Auswirkungen zu verursachen.

Official advisory
BSI · German · WID-SEC-W-2025-0227IBM QRadar SIEM: Mehrere Schwachstellen

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in IBM QRadar SIEM ausnutzen, um seine Privilegien zu erweitern, Administratorrechte zu erlangen, beliebigen Programmcode auszuführen, Informationen offenzulegen, Dateien zu manipulieren oder Sicherheitsvorkehrungen zu umgehen.

Official advisory
BSI · German · WID-SEC-W-2023-1350Splunk Splunk Enterprise: Mehrere Schwachstellen in Komponenten von Drittanbietern

Ein Angreifer kann mehrere Schwachstellen in Splunk Splunk Enterprise in diversen Komponenten von Drittanbietern ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.

Official advisory
BSI · German · WID-SEC-W-2023-1635libcurl: Schwachstelle ermöglicht Offenlegung von Informationen

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in libcurl ausnutzen, um Informationen offenzulegen.

Official advisory
CERT-FR · French · CERTFR-2023-AVI-1015Multiples vulnérabilités dans les produits Siemens

CVERecord?id=CVE-2020-36226 Référence CVE CVE-2020-36227 https://www.cve.org/CVERecord?id=CVE-2020-36227 Référence CVE CVE-2020-36228 https://www.cve.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-2021-2022

Official advisory
CERT-FR · French · CERTFR-2023-AVI-0701Multiples vulnérabilités dans Splunk

ecord?id=CVE-2018-20225 Référence CVE CVE-2019-20454 https://www.cve.org/CVERecord?id=CVE-2019-20454 Référence CVE CVE-2019-20838 https://www.cve.org/CVERecord?id=CVE-2019-20838 Référence CVE CVE-2020-14155 https://www.cve.org/CVERecord?id=CVE-2020-14155 Référence CVE CVE-2020-28469 https://www.cve.org/CVERecord?id=CVE-2020-28469 Référence CVE CVE-2020-28851 https://www.cve.org/CVERecord?id=CVE-2020-28851 Référence CVE CVE-2020-29652 https://www.cve.org/CVERecord?id=CVE-2020-29652 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-2020-8908 https://www.cve.org/CVERecord?id=CVE-2020-8908 Référence CVE CVE-2021-20066 https://www.cve.org/CVERecord?id=CVE-2021-20066 Référence CVE CVE-2021-22569 https://www.cve.org/CVERecord?id=CVE-2021-22569 Référence CVE CVE-2021-22876 https://www.cve.org/CVERecord?id=CVE-2021-22876 Référence CVE CVE-2021-22890 https://www.cve.org/CVERecord?id=CVE-2021-

Official advisory
CERT-FR · French · CERTFR-2023-AVI-0428Multiples vulnérabilités dans les produits Splunk

e.org/CVERecord?id=CVE-2020-15138 Référence CVE CVE-2020-28469 https://www.cve.org/CVERecord?id=CVE-2020-28469 Référence CVE CVE-2020-7662 https://www.cve.org/CVERecord?id=CVE-2020-7662 Référence CVE CVE-2020-7753 https://www.cve.org/CVERecord?id=CVE-2020-7753 Référence CVE CVE-2020-7774 https://www.cve.org/CVERecord?id=CVE-2020-7774 Référence CVE CVE-2020-8116 https://www.cve.org/CVERecord?id=CVE-2020-8116 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-2020-8203 https://www.cve.org/CVERecord?id=CVE-2020-8203 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-2021-20095 https://www.cve.org/CVERecord?id=CVE-2021-20095 Référence CVE CVE-2021-22876 https://www.cve.org/CVERecord?id=CVE-2021-22876 Référence CVE CVE-2021-22890 https://www.cve.org/CVERecord?id=CVE-2021-22890 Référence CVE CVE-2021-22897 https://www.cve.org/CVERecord?id=CVE-2021-22897 Référence CVE CVE-2021-22898 https://www.cve.org/CVERecord?id=CVE-202

Official advisory
CERT-FR · French · CERTFR-2022-AVI-216Multiples vulnérabilités dans les produits Siemens

CVERecord?id=CVE-2020-13631 Référence CVE CVE-2020-13632 https://www.cve.org/CVERecord?id=CVE-2020-13632 Référence CVE CVE-2020-13871 https://www.cve.org/CVERecord?id=CVE-2020-13871 Référence CVE CVE-2020-15358 https://www.cve.org/CVERecord?id=CVE-2020-15358 Référence CVE CVE-2020-1971 https://www.cve.org/CVERecord?id=CVE-2020-1971 Référence CVE CVE-2020-27304 https://www.cve.org/CVERecord?id=CVE-2020-27304 Référence CVE CVE-2020-7774 https://www.cve.org/CVERecord?id=CVE-2020-7774 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-2020-8265 https://www.cve.org/CVERecord?id=CVE-2020-8265 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-2020-8287 https://www.cve.org/CVERecord?id=CVE-2020-8287 Référence CVE CVE-2020-8625 https://www.cve.org/CVERecord?id=CVE-2020-8625 Référence CVE CVE-2020-9327 https://www.cve.org/CVERecord?id=CVE-2020-9327 Référence CVE CVE-2021-22876 https://www.cve.org/CVERecord?id=CVE-2021-22876

Official advisory
CERT-FR · French · CERTFR-2021-AVI-791Multiples vulnérabilités dans les produits IBM

ecord?id=CVE-2020-28469 Référence CVE CVE-2020-29361 https://www.cve.org/CVERecord?id=CVE-2020-29361 Référence CVE CVE-2020-29362 https://www.cve.org/CVERecord?id=CVE-2020-29362 Référence CVE CVE-2020-29363 https://www.cve.org/CVERecord?id=CVE-2020-29363 Référence CVE CVE-2020-29573 https://www.cve.org/CVERecord?id=CVE-2020-29573 Référence CVE CVE-2020-36328 https://www.cve.org/CVERecord?id=CVE-2020-36328 Référence CVE CVE-2020-36329 https://www.cve.org/CVERecord?id=CVE-2020-36329 Référence CVE CVE-2020-4951 https://www.cve.org/CVERecord?id=CVE-2020-4951 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-2020-8617 https://www.cve.org/CVERecord?id=CVE-2020-8617 Référence CVE CVE-2020-8622 https://www.cve.org/CVERecord?id=CVE-2020-8622 Référence CVE CVE-2020-8624 https://www.cve.org/CVERecord?id=CVE-2020-8624 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 4 Aug 2024, 09:56 UTC · CWE-416 · Use After Free

CVE recordCVE.org · 5.1
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-2020-29103
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-2020-29103↗Vendor CSAF · Siemens ProductCERT↗Public exploit reference↗Patch or update reference↗Patch or update reference↗Patch or update reference↗Official CVE record (CNA and ADP data)↗NVD record↗
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-2020-8231 · cve.blacktree.nl