MEDIUM
CVE-2012-5821
CWE-295Published: November 4, 2012· Updated: Jun 16, 2026
5.9
CVSS v3.1
Official 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.
Technical Analysis
CVE-2012-5821 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 5.9.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected Vendors & Products
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (10)
→
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.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
Quick Facts
CVE IDCVE-2012-5821
CVSS Score5.9 / 10
SeverityMEDIUM
WeaknessCWE-295
CISA KEVNo
Affected2 vendor(s)
PublishedNov 4, 2012
Related CVEs (CWE-295)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2012-5821 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.