# CVE-2020-8231: CVE-2020-8231

Status: published. Published: 2020-12-14. Updated: 2026-11-02.

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

## Remediation

No remediation reported in collected sources

## Affected products and versions

- n/a / https://github.com/curl/curl: libcurl 7.29.0 to and including 7.71.1 (affected). Source: CNA: hackerone
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: ≥ V3.1.0; < V3.1.5 (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: ≥ V3.1.0; < V3.1.5 (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: ≥ V3.1.0; < V3.1.5 (affected, custom). Source: ADP: siemens-SADP

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 5.34% as of 2026-11-02; percentile 92.63%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-416

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://hackerone.com/reports/948876 (CNA: hackerone; x_refsource_MISC)

- https://curl.haxx.se/docs/CVE-2020-8231.html (CNA: hackerone; x_refsource_MISC)

- https://security.gentoo.org/glsa/202012-14 (CNA: hackerone; vendor-advisory, x_refsource_GENTOO)

- https://www.debian.org/security/2021/dsa-4881 (CNA: hackerone; vendor-advisory, x_refsource_DEBIAN)

- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E (CNA: hackerone; mailing-list, x_refsource_MLIST)

- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E (CNA: hackerone; mailing-list, x_refsource_MLIST)

- https://www.oracle.com/security-alerts/cpuapr2022.html (CNA: hackerone; x_refsource_MISC)

- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf (CNA: hackerone; x_refsource_CONFIRM)

- https://hackerone.com/reports/948876 (ADP: CVE; x_refsource_MISC, x_transferred)

- https://curl.haxx.se/docs/CVE-2020-8231.html (ADP: CVE; x_refsource_MISC, x_transferred)

- https://security.gentoo.org/glsa/202012-14 (ADP: CVE; vendor-advisory, x_refsource_GENTOO, x_transferred)

- https://www.debian.org/security/2021/dsa-4881 (ADP: CVE; vendor-advisory, x_refsource_DEBIAN, x_transferred)

- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E (ADP: CVE; mailing-list, x_refsource_MLIST, x_transferred)

- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E (ADP: CVE; mailing-list, x_refsource_MLIST, x_transferred)

- https://www.oracle.com/security-alerts/cpuapr2022.html (ADP: CVE; x_refsource_MISC, x_transferred)

- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf (ADP: CVE; x_refsource_CONFIRM, x_transferred)

- https://cert-portal.siemens.com/productcert/html/ssa-389290.html (ADP: siemens-SADP)

- https://cert-portal.siemens.com/productcert/html/ssa-398330.html (ADP: siemens-SADP)

## Provenance

- CNA: hackerone: https://www.cve.org/CVERecord?id=CVE-2020-8231; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2020-8231; retrieved 2026-11-02; source updated Not reported

Revision: 12f06da324c110f04ab946ec348f2d7d5f2c46be6faa6fb806bc1138562c366b

Canonical: https://y2.dev/cve/CVE-2020-8231

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