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Vulnerability record · CVE-2012-5821 · published 4 November 2012

CVE-2012-5821: Lynx improper certificate validation vulnerability

Lynx · Lynx

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.

5.9 CVSS 3.1 Medium EPSS 0.81% · top 44.8% CWE-295 · Improper certificate validation
5.9CVSS 3.1 base score, v2 5.8
0.81%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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 AdvisoryVDB Entry
https://wiki.mageia.org/en/Support/Advisories/MGASA-2012-0351 Third Party Advisory
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 AdvisoryVDB Entry
https://wiki.mageia.org/en/Support/Advisories/MGASA-2012-0351 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2012-5821), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.