HOME VULNERABILITIESCVE-2011-2691

MEDIUM

CVE-2011-2691

CWE-476Published: July 17, 2011· Updated: Jun 16, 2026

6.5

CVSS v3.1

Official Description

The png_err function in pngerror.c in libpng 1.0.x before 1.0.55, 1.2.x before 1.2.45, 1.4.x before 1.4.8, and 1.5.x before 1.5.4 makes a function call using a NULL pointer argument instead of an empty-string argument, which allows remote attackers to cause a denial of service (application crash) via a crafted PNG image.

Technical Analysis

CVE-2011-2691 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected Vendors & Products

Debian1 product(s)

debian linux

Fedora1 product(s)

fedora

libpng1 product(s)

libpng

Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=720608

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=720608

ADVISORYhttp://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2011-July/063118.html

ADVISORYhttp://marc.info/?l=bugtraq&m=133951357207000&w=2

ADVISORYhttp://security.gentoo.org/glsa/glsa-201206-15.xml

ADVISORYhttp://support.apple.com/kb/HT5002

ADVISORYhttp://www.debian.org/security/2011/dsa-2287

ADVISORYhttp://www.libpng.org/pub/png/libpng.html

ADVISORYhttp://www.openwall.com/lists/oss-security/2011/07/13/2

ADVISORYhttp://www.securityfocus.com/bid/48660

ADVISORYhttps://exchange.xforce.ibmcloud.com/vulnerabilities/68537

ADVISORYhttp://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2011-July/063118.html

ADVISORYhttp://marc.info/?l=bugtraq&m=133951357207000&w=2

ADVISORYhttp://security.gentoo.org/glsa/glsa-201206-15.xml

ADVISORYhttp://support.apple.com/kb/HT5002

ADVISORYhttp://www.debian.org/security/2011/dsa-2287

ADVISORYhttp://www.libpng.org/pub/png/libpng.html

ADVISORYhttp://www.openwall.com/lists/oss-security/2011/07/13/2

ADVISORYhttp://www.securityfocus.com/bid/48660

ADVISORYhttps://exchange.xforce.ibmcloud.com/vulnerabilities/68537

All References (34)

→

http://libpng.git.sourceforge.net/git/gitweb.cgi?p=libpng/libpng%3Ba=commit%3Bh=9dad5e37aef295b4ef8dea39392b652deebc9261

→

http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.htmlMailing List · Third Party Advisory

→

http://lists.fedoraproject.org/pipermail/package-announce/2011-July/063118.htmlMailing List · Third Party Advisory

→

http://marc.info/?l=bugtraq&m=133951357207000&w=2Mailing List · Third Party Advisory

→

http://secunia.com/advisories/45046Broken Link

→

http://secunia.com/advisories/45405Broken Link

→

http://secunia.com/advisories/45492Broken Link

→

http://secunia.com/advisories/49660Broken Link

→

http://security.gentoo.org/glsa/glsa-201206-15.xmlThird Party Advisory

→

http://support.apple.com/kb/HT5002Third Party Advisory

→

http://www.debian.org/security/2011/dsa-2287Third Party Advisory

→

http://www.libpng.org/pub/png/libpng.htmlProduct · Vendor Advisory

→

http://www.mandriva.com/security/advisories?name=MDVSA-2011:151Broken Link

→

http://www.openwall.com/lists/oss-security/2011/07/13/2Mailing List · Third Party Advisory

→

http://www.securityfocus.com/bid/48660Third Party Advisory · VDB Entry

Quick Facts

CVE IDCVE-2011-2691

CVSS Score6.5 / 10

SeverityMEDIUM

WeaknessCWE-476

CISA KEVNo

Affected3 vendor(s)

PublishedJul 17, 2011

Related CVEs (CWE-476)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2011-2691 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.

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