CVE-2011-3940

nsvdec.c in libavcodec in FFmpeg 0.7.x before 0.7.12 and 0.8.x before 0.8.11, and in Libav 0.5.x before 0.5.9, 0.6.x before 0.6.6, 0.7.x before 0.7.5, and 0.8.x before 0.8.1, allows remote attackers to cause a denial of service (out-of-bounds read and write) via a crafted NSV file that triggers "use of uninitialized streams."

Published: 2012-08-20 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-3940 is rated Moderate Risk (58.4/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.73%). EPSS rose +1.71% over the last day, indicating growing attacker interest. Review affected assets and schedule 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-2011-3940

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 1.02% 2.73% +1.71%
2 2025-03-30 1.05% 1.02% -0.03%
3 2025-03-29 — 1.05% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-3940

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-2011-3940

OS Trackers for CVE-2011-3940

vendor priority summary link
debian not yet assigned CVE-2011-3940 not yet assigned priority: Debian including 1 source packages (ffmpeg), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2011-3940
gentoo high CVE-2011-3940: 2 GLSA(s) (201210-06, 201310-12), 2 atom(s) (media-video/ffmpeg, media-video/libav); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2011-3940
ubuntu medium CVE-2011-3940 medium priority: Ubuntu including 4 source packages (ffmpeg, ffmpeg-extra, libav, libav-extra), 24 status rows across 6 suites (hardy, lucid, natty, oneiric, precise, upstream): DNE 11, released 8, needs-triage 2, not-affected 2, ignored 1. https://ubuntu.com/security/CVE-2011-3940

Affected software / configurations for CVE-2011-3940

Vendor Product Version Raw CPE
ffmpeg ffmpeg 0.7.1 cpe:2.3:a:ffmpeg:ffmpeg:0.7.1:*:*:*:*:*:*:*
ffmpeg ffmpeg 0.7.2 cpe:2.3:a:ffmpeg:ffmpeg:0.7.2:*:*:*:*:*:*:*
ffmpeg ffmpeg 0.7.6 cpe:2.3:a:ffmpeg:ffmpeg:0.7.6:*:*:*:*:*:*:*
ffmpeg ffmpeg 0.7.7 cpe:2.3:a:ffmpeg:ffmpeg:0.7.7:*:*:*:*:*:*:*
ffmpeg ffmpeg 0.7.8 cpe:2.3:a:ffmpeg:ffmpeg:0.7.8:*:*:*:*:*:*:*
ffmpeg ffmpeg 0.7.9 cpe:2.3:a:ffmpeg:ffmpeg:0.7.9:*:*:*:*:*:*:*
ffmpeg ffmpeg 0.7.11 cpe:2.3:a:ffmpeg:ffmpeg:0.7.11:*:*:*:*:*:*:*
ffmpeg ffmpeg 0.8.5 cpe:2.3:a:ffmpeg:ffmpeg:0.8.5:*:*:*:*:*:*:*
ffmpeg ffmpeg 0.8.6 cpe:2.3:a:ffmpeg:ffmpeg:0.8.6:*:*:*:*:*:*:*
ffmpeg ffmpeg 0.8.7 cpe:2.3:a:ffmpeg:ffmpeg:0.8.7:*:*:*:*:*:*:*
ffmpeg ffmpeg 0.8.8 cpe:2.3:a:ffmpeg:ffmpeg:0.8.8:*:*:*:*:*:*:*
ffmpeg ffmpeg 0.8.10 cpe:2.3:a:ffmpeg:ffmpeg:0.8.10:*:*:*:*:*:*:*
libav libav 0.5 cpe:2.3:a:libav:libav:0.5:*:*:*:*:*:*:*
libav libav 0.5.1 cpe:2.3:a:libav:libav:0.5.1:*:*:*:*:*:*:*
libav libav 0.5.2 cpe:2.3:a:libav:libav:0.5.2:*:*:*:*:*:*:*
libav libav 0.5.3 cpe:2.3:a:libav:libav:0.5.3:*:*:*:*:*:*:*
libav libav 0.5.4 cpe:2.3:a:libav:libav:0.5.4:*:*:*:*:*:*:*
libav libav 0.5.5 cpe:2.3:a:libav:libav:0.5.5:*:*:*:*:*:*:*
libav libav 0.5.6 cpe:2.3:a:libav:libav:0.5.6:*:*:*:*:*:*:*
libav libav 0.5.7 cpe:2.3:a:libav:libav:0.5.7:*:*:*:*:*:*:*
libav libav 0.6 cpe:2.3:a:libav:libav:0.6:*:*:*:*:*:*:*
libav libav 0.6.1 cpe:2.3:a:libav:libav:0.6.1:*:*:*:*:*:*:*
libav libav 0.6.2 cpe:2.3:a:libav:libav:0.6.2:*:*:*:*:*:*:*
libav libav 0.6.3 cpe:2.3:a:libav:libav:0.6.3:*:*:*:*:*:*:*
libav libav 0.6.4 cpe:2.3:a:libav:libav:0.6.4:*:*:*:*:*:*:*
libav libav 0.6.5 cpe:2.3:a:libav:libav:0.6.5:*:*:*:*:*:*:*
libav libav 0.7 cpe:2.3:a:libav:libav:0.7:*:*:*:*:*:*:*
libav libav 0.7.1 cpe:2.3:a:libav:libav:0.7.1:*:*:*:*:*:*:*
libav libav 0.7.2 cpe:2.3:a:libav:libav:0.7.2:*:*:*:*:*:*:*
libav libav 0.7.3 cpe:2.3:a:libav:libav:0.7.3:*:*:*:*:*:*:*
libav libav 0.7.4 cpe:2.3:a:libav:libav:0.7.4:*:*:*:*:*:*:*
libav libav 0.8 cpe:2.3:a:libav:libav:0.8:*:*:*:*:*:*:*
libav libav 0.8 cpe:2.3:a:libav:libav:0.8:beta2:*:*:*:*:*:*

References for CVE-2011-3940

cvelogic Threat Intelligence