CVE-2020-12823

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

OpenConnect 8.09 has a buffer overflow, causing a denial of service (application crash) or possibly unspecified other impact, via crafted certificate data to get_cert_name in gnutls.c.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation5% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
5%
EPSS %ILE
91%
KEV
Not listed

Published

May 12, 2020

Last Modified

November 21, 2024

Advisory Details (7)

Auto-updated Sep 13, 2026
Patch available.
generic

OpenConnect: Multiple vulnerabilities (GLSA 202006-15) — Gentoo security

https://security.gentoo.org/glsa/202006-15
generic

[SECURITY] Fedora 31 Update: openconnect-8.10-1.fc31 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BEVTIH5UFX35CC7MVSYBGRM3D66ACFD5/
generic

[SECURITY] Fedora 32 Update: openconnect-8.10-1.fc32 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AYSXLXAPXD2T73T6JMHI5G2WP7KHAGMN/
generic

[SECURITY] Fedora 30 Update: openconnect-8.10-1.fc30 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/25MFX4AZE7RDCUWOL4ZOE73YBOPUMQDX/
generic Patch Available

[SECURITY] [DLA 2212-1] openconnect security update

https://lists.debian.org/debian-lts-announce/2020/05/msg00015.html
generic

gnutls: prevent buffer overflow in get_cert_name (!108) · Merge requests · OpenConnect VPN projects / OpenConnect · GitLab

https://gitlab.com/openconnect/openconnect/-/merge_requests/108
generic

721570 – net-vpn/ocserv-1.0.1: test failures on arm64 due to stack smashing detection with LD_PRELOAD=libsocket_wrapper.so

https://bugs.gentoo.org/721570

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
openconnect—8.10-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
openconnect—8.10-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
openconnect—8.10-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
openconnect—8.10-1—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
openconnect6.00-2, 6.00-2+deb8u16.00-2+deb8u2—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 23× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 148 total refreshes for this CVE.

  1. 2026-09-19 15:37 UTCEPSS rescore
  2. 2026-09-18 19:23 UTCEPSS rescore
  3. 2026-09-17 19:22 UTCEPSS rescore
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  27. 2026-07-23 14:15 UTCEPSS rescore
  28. 2026-07-23 01:49 UTCEG score recompute
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2020-12823?
CVE-2020-12823 is a critical vulnerability published on May 12, 2020. OpenConnect 8.09 has a buffer overflow, causing a denial of service (application crash) or possibly unspecified other impact, via crafted certificate data to getcertname in gnutls.c.
When was CVE-2020-12823 disclosed?
CVE-2020-12823 was first published in the National Vulnerability Database on May 12, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-12823 actively exploited?
CVE-2020-12823 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5% probability of exploitation in the next 30 days, which ranks it in the top 8.7% of all scored CVEs.
What is the CVSS score of CVE-2020-12823?
CVE-2020-12823 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-12823?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-12823, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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