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CVE-2012-3405

The vfprintf function in stdio-common/vfprintf.c in libc in GNU C Library (aka glibc) 2.14 and other versions does not properly calculate a buffer length, which allows context-dependent attackers to bypass the FORTIFY_SOURCE format-string protection mechanism and cause a denial of service (segmentation fault and crash) via a format string with a large number of format specifiers that triggers…

Severity
Medium 5.0
Published
10 Feb 2014
Last changed
16 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
2.1% in the next 30 daysHigher than 81% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
CWE-189
Attack
Over the network · No login needed
Attacker can
Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Sources
NVD

Description

The vfprintf function in stdio-common/vfprintf.c in libc in GNU C Library (aka glibc) 2.14 and other versions does not properly calculate a buffer length, which allows context-dependent attackers to bypass the FORTIFY_SOURCE format-string protection mechanism and cause a denial of service (segmentation fault and crash) via a format string with a large number of format specifiers that triggers "desynchronization within the buffer size handling," a different vulnerability than CVE-2012-3404.

From NVD.

Affected software

SoftwareAffected versions
GNU C LibraryServers and applications · cpe:a:gnu:glibc
  • Version 2.14

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2012-3405
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2012-3405