CVE-2012-5821

Name: CVE-2012-5821
Creator: NVD / NIST
Published: 2012-11-04T22:55:04.827+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 0.81%

Last modified Jun 16, 2026

CVE-2012-5821 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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.. EPSS estimates a 0.81% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.9/10

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

EPSS Probability

0.81%

52.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

Affected Software

Vendor	Product	Versions
Lynx	Lynx	All versions
Canonical	Ubuntu Linux	10.04
Canonical	Ubuntu Linux	11.10
Canonical	Ubuntu Linux	12.04
Canonical	Ubuntu Linux	12.10

References

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

Timeline

Published: Nov 4, 2012
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2012-5821?

How severe is CVE-2012-5821?

CVE-2012-5821 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 0.81% probability of exploitation in the next 30 days.

How do I fix CVE-2012-5821?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2012-5821?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST