CVE-2012-5824: Trillian 5.1.0.19 does not verify that the server hostname matches a domain name in the subject's Common Name

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MEDIUM 5.8DOWNGRADE

CVE-2012-5824 is a medium-severity flaw (CVSS 5.8) affecting trillian. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Trillian 5.1.0.19 does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate, a different vulnerability than CVE-2009-4831.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.8 (Medium)
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-295
Published	2012-11-04
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: cerulean studios

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2012-11-04 22:55 UTCPublished CVE record published
2026-06-16 23:47 UTCUpdated Record last modified

cerulean studios trillian DOWNGRADE

Affected: 5.1.0.19

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.1.0.19

1. Check installed version

apt-cache policy trillian || rpm -q trillian || trillian --version

2. No fixed release: DOWNGRADE to a release before 5.1.0.19 (Debian / Ubuntu)

apt-cache madison trillian sudo apt install trillian=<VERSION_BEFORE_5.1.0.19> sudo apt-mark hold trillian

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list trillian sudo dnf downgrade trillian-<VERSION_BEFORE_5.1.0.19> sudo dnf versionlock add trillian

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2012-5824?

trillian: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2012-5824 being exploited?

CVE-2012-5824 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2012-5824 affect?

CVE-2012-5824 affects trillian. Severity is medium (CVSS 5.8). Trillian 5.1.0.19 does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitr

How urgent is CVE-2012-5824?

Priority 42/100. Public exploit reference

Related CVEs

CVE-2009-4831 MEDIUM 5.8 DOWNGRADE Cerulean Studios Trillian 3.1 Basic does not check SSL certificates during MSN authentication, which allows re
CVE-2008-6563 HIGH 9.3 DOWNGRADE Buffer overflow in the XML parser in Trillian 3.1.9.0, and possibly earlier, allows remote attackers to cause
CVE-2008-5403 HIGH 10.0 DOWNGRADE DOWNGRADE Heap-based buffer overflow in the XML parser in the AIM plugin in Trillian before 3.1.12.0 allows remote attac
CVE-2008-5402 HIGH 10.0 DOWNGRADE DOWNGRADE Double free vulnerability in the XML parser in Trillian before 3.1.12.0 allows remote attackers to execute arb
CVE-2008-5401 HIGH 10.0 UPGRADE DOWNGRADE Stack-based buffer overflow in the image tooltip implementation in Trillian before 3.1.12.0 allows remote atta

References

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