Is CVE-2012-5821 being actively exploited?

CVE-2012-5821 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2012-5821?

CVE-2012-5821 has a CVSS 3.1 base score of 5.9 (MEDIUM).

CVE-2012-5821

MEDIUM · CVSS 5.9EPSS 0.8%EU EUVD

Lynx does not verify that the server's certificate is signed by a trusted certification authority, which allows man-in-the-middle attackers to spoof SSL servers via a crafted certificate, related to improper use of a certain GnuTLS function.

Key facts

CVSS score: 5.9 (v3.1)
Severity: MEDIUM
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-295
EPSS score: 0.8% (57th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2012-5700)
Published: November 4, 2012
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2012-5700 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
lynx / lynx

References

http://www.cs.utexas.edu/~shmat/shmat_ccs12.pdf(Exploit)
http://www.mandriva.com/security/advisories?name=MDVSA-2013:101(Broken Link)
http://www.ubuntu.com/usn/USN-1642-1(Third Party Advisory)
https://exchange.xforce.ibmcloud.com/vulnerabilities/79930(Third Party Advisory, VDB Entry)
https://wiki.mageia.org/en/Support/Advisories/MGASA-2012-0351(Third Party Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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