CVE-2012-5821

5.9 MEDIUM 0.8% exploit odds No fix listed

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data tampering.
Exploit odds: 0.8% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2012-11-04 22:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 23:47 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.8% in the next 30 days (EPSS).
Severity: 5.9 MEDIUM (CVSS).
Fix: none linked yet, which raises it.

Details

Published: 2012-11-04 22:55 UTC
Last modified: 2026-06-16 23:47 UTC
Exploit probability: 0.8% · EPSS, next 30 days
Weakness: CWE-295 · Improper certificate validation
Record status: Modified

Affected

Lynx
Canonical Ubuntu Linux 10.04
Canonical Ubuntu Linux 11.10
Canonical Ubuntu Linux 12.04
Canonical Ubuntu Linux 12.10

Attack profile CVSS 3.1 · 5.9

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: High
Availability: None

Raw vector

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

Is it in your code?

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References

NVD record · CVE.org record