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No exploitation reportedFix available

CVE-2020-8231

No exploitation reported by the sources we read.

  • Published2020-12-14
  • Fixed in9.0.6 · 8.2.12
  • WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC
  1. 2020-12-1419:39CVE publishedCNA

Versions per branch

NVD
Splunk universal forwarder
BranchAffectedFixed in
9.0≥ 9.0.0, < 9.0.69.0.6
8.2≥ 8.2.0, < 8.2.128.2.12
9.1= 9.1.0no fix published
Debian debian linux
BranchAffectedFixed in
10.0= 10.0no fix published
Haxx libcurl
BranchAffectedFixed in
7.x≥ 7.29.0, ≤ 7.71.1no fix published

2 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As hackerone, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • https://github.com/curl/curl
    Affected
    • = libcurl 7.29.0 to and including 7.71.1no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2022-04-19

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • curlUbuntu:Pro:14.04:LTSall versions · fixed in 7.35.0-1ubuntu2.20+esm5
  • curlUbuntu:20.04:LTSall versions · fixed in 7.68.0-1ubuntu2.2
  • curlUbuntu:20.04:LTSall versions · fixed in 7.68.0-1ubuntu2.4
  • curlUbuntu:18.04:LTSall versions · fixed in 7.58.0-2ubuntu3.10
  • curlUbuntu:18.04:LTSall versions · fixed in 7.58.0-2ubuntu3.12
  • curlUbuntu:16.04:LTSall versions · fixed in 7.47.0-1ubuntu2.16
  • curlUbuntu:16.04:LTSall versions · fixed in 7.47.0-1ubuntu2.18
  • curlSUSE:OpenStack Cloud Crowbar 9all versions · fixed in 7.60.0-4.20.1

41 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-8231 Red Hat Product Security45 products fixed · 10 known affected

    curl: Expired pointer dereference via multi API with CURLOPT_CONNECT_ONLY option set

    curl.src as a component of Red Hat Ceph Storage 2 · libcurl as a component of Red Hat Ceph Storage 2 · curl as a component of Red Hat Enterprise Linux 7 · +7 more

  • ICSA-23-348-10 CISA5 known affected

    Siemens SIMATIC S7-1500

    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) · +2 more

  • SSA-398330 Siemens ProductCERT5 known affected

    SSA-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

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.0 < V3.1.5 · +2 more

  • ICSA-22-069-09 CISA1 known affected

    Siemens SINEC INS

    SINEC INS

  • SSA-389290 Siemens ProductCERT1 known affected

    SSA-389290: Third-Party Component Vulnerabilities in SINEC INS

    SINEC INS

  • RHSA-2021:1610 Red Hat Product Security45 products fixed

    Red Hat Security Advisory: curl security and bug fix update

Full record on NVD

Fix

  1. Update Splunk universal forwarder to 9.0.6 · 8.2.12
  2. Vendor fix CISA ICSA-23-348-10 · 5 productsUpdate to V3.1.5 or later version
  3. Vendor fix Siemens ProductCERT SSA-398330 · 1 productUpdate to V3.1.5 or later version
  4. Vendor fix Siemens ProductCERT SSA-389290 · 1 productUpdate to V1.0.1.1 or later version
  5. Vendor fix CISA ICSA-22-069-09 · 1 productUpdate to V1.0.1.1 or later version
  6. Vendor fix Red Hat Product Security RHSA-2021:1610 · 45 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  7. Mitigation from the vendor CISA ICSA-23-348-10 · 5 productsOnly build and run applications from trusted sources.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2026-11-02
  • NVDCVSS 3.17.5read 2026-11-02
  • NVDCVSS 2.05read 2026-11-02
  • CNAweakness (CWE)CWE-4162022-04-19
  • NVDweakness (CWE)CWE-416read 2026-11-02
  • FIRST EPSSEPSS score5.3 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2020-12-14
Last Modified
2026-11-02
NVD status
Modified
GitHub Advisory
GHSA-xp52-49j5-h754

Frequently asked questions

What is CVE-2020-8231?

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

Is CVE-2020-8231 actively exploited?

Active exploitation of CVE-2020-8231 has not been confirmed. Its EPSS score was 5.3% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-8231?

CVE-2020-8231 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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