CVE-2011-2691

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2022-05-13. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 4%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
89.1%
KEV
Not listed

Published

July 17, 2011

Last Modified

April 29, 2026

Advisory Details (7)

Auto-updated May 29, 2026
No patch confirmed yet.
generic

libpng: Multiple vulnerabilities (GLSA 201206-15) — Gentoo security

http://security.gentoo.org/glsa/glsa-201206-15.xml
generic

About Secunia Research | Flexera

http://secunia.com/advisories/49660
generic

About Secunia Research | Flexera

http://secunia.com/advisories/45492
generic

About Secunia Research | Flexera

http://secunia.com/advisories/45405
generic

About Secunia Research | Flexera

http://secunia.com/advisories/45046
generic

'[security bulletin] HPSBMU02776 SSRT100852 rev.1 - HP Onboard Administrator (OA), Remote Unauthorize' - MARC

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

LIBPNG: PNG reference library / Git tools

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

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 37× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 21:47 UTCEG score recompute
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Frequently asked(5)

What is CVE-2011-2691?
CVE-2011-2691 is a medium vulnerability published on July 17, 2011. 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)…
When was CVE-2011-2691 disclosed?
CVE-2011-2691 was first published in the National Vulnerability Database on July 17, 2011, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2011-2691 actively exploited?
CVE-2011-2691 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 89.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2011-2691?
CVE-2011-2691 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2011-2691?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-2691, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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