CVE-2012-4426

Multiple format string vulnerabilities in mcrypt 2.6.8 and earlier might allow user-assisted remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via vectors involving (1) errors.c or (2) mcrypt.c.

Published: 2012-11-21 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2012-4426 is rated Moderate Risk (53.9/100): CVSS Medium severity, with high exploitation likelihood (EPSS 4.70%, 91th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2012-4426

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 14.86% 4.70% -10.17%
2 2025-03-30 27.53% 14.86% -12.67%
3 2025-03-29 — 27.53% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2012-4426

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2012-4426

OS Trackers for CVE-2012-4426

vendor priority summary link
debian not yet assigned CVE-2012-4426 not yet assigned priority: Debian including 1 source packages (mcrypt), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2012-4426
gentoo normal CVE-2012-4426: 1 GLSA(s) (201405-19), 1 atom(s) (app-crypt/mcrypt); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2012-4426
ubuntu low CVE-2012-4426 low priority: Ubuntu including 1 source packages (mcrypt), 16 status rows across 16 suites (hardy, lucid, natty, oneiric, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): not-affected 9, ignored 5, DNE 1, released 1. https://ubuntu.com/security/CVE-2012-4426

Affected software / configurations for CVE-2012-4426

Vendor Product Version Raw CPE
mcrypt mcrypt <= 2.6.8 cpe:2.3:a:mcrypt:mcrypt:*:*:*:*:*:*:*:*
mcrypt mcrypt 2.6.4 cpe:2.3:a:mcrypt:mcrypt:2.6.4:*:*:*:*:*:*:*
mcrypt mcrypt 2.6.5 cpe:2.3:a:mcrypt:mcrypt:2.6.5:*:*:*:*:*:*:*
mcrypt mcrypt 2.6.6 cpe:2.3:a:mcrypt:mcrypt:2.6.6:*:*:*:*:*:*:*
mcrypt mcrypt 2.6.7 cpe:2.3:a:mcrypt:mcrypt:2.6.7:*:*:*:*:*:*:*

References for CVE-2012-4426

cvelogic Threat Intelligence