5.9

CVE-2012-5821: canonical ubuntu_linux Improper Certificate Validation

Modified
AliasesCGA-765w-c82p-qqgxCGA-98jh-m983-48r6CGA-pq27-w8g8-r3m4
Published 04-11-2012Last modified 06-08-2024

Vulnerability summary

CVE-2012-5821 is a medium (CVSS 5.9) Improper Certificate Validation vulnerability in canonical ubuntu_linux. EPSS estimates a 0.81% chance of exploitation in the next 30 days, higher than 56.9% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.9/10
010
Medium · v3.1 (NVD)
EPSS score
0.81%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 0 · Related 2
CGA-33J6-2JCW-J9JJCGA-VXH6-MW79-R4GG

Timeline

  1. 04-11-2012
    PublishedVulnerability first disclosed.
  2. 06-08-2024
    Last modifiedVulnerability information updated.

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 metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

0.81%

Chance of exploitation in the next 30 days

Percentile

57%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.81% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (cs.utexas.edu)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard3 products
  • lynxAll versions (No fix recorded)
  • lynx-docAll versions (No fix recorded)
  • lynx-langAll versions (No fix recorded)
Wolfi3 products
  • lynxAll versions (No fix recorded)
  • lynx-docAll versions (No fix recorded)
  • lynx-langAll versions (No fix recorded)
Canonical1 product
Lynx1 product

4 vendors · 8 products

References

5 links