CVE-2020-12105

MEDIUMNVD 5.95.9—

5.9

OpenConnect through 8.08 mishandles negative return values from X509_check_ function calls, which might assist attackers in performing man-in-the-middle attacks.

CVSS v3: 5.9
EG Score: 5.9(medium)
EPSS: 37.9%
KEV: Not listed

Published

April 23, 2020

Last Modified

November 21, 2024

References (6)

cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2020-05/msg00039.html
cve@mitrehttps://gitlab.com/openconnect/openconnect/-/merge_requests/96
cve@mitrehttps://security.gentoo.org/glsa/202006-15
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00039.html
af854a3a-2127-422b-91ae-364da2661108https://gitlab.com/openconnect/openconnect/-/merge_requests/96
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202006-15

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 04:21 UTCEG score recompute
2026-05-27 04:21 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 03:16 UTCOSV refresh

Frequently asked(5)

What is CVE-2020-12105?

CVE-2020-12105 is a medium vulnerability published on April 23, 2020. OpenConnect through 8.08 mishandles negative return values from X509check function calls, which might assist attackers in performing man-in-the-middle attacks.

When was CVE-2020-12105 disclosed?

CVE-2020-12105 was first published in the National Vulnerability Database on April 23, 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-2020-12105 actively exploited?

CVE-2020-12105 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 37.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-12105?

CVE-2020-12105 has a CVSS v3 base score of 5.9 (NVD).

How do I remediate CVE-2020-12105?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-12105, 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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2020-12105

Explore →

Is Your Infrastructure Affected by CVE-2020-12105?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2020-12105

📅 Published

🔄 Last Modified

🔗 References (6)