No exploitation reportedFix available

CVE-2011-2501

Q: Is CVE-2011-2501 actively exploited?

Active exploitation of CVE-2011-2501 has not been confirmed. Its EPSS score was 3.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2011-2501?

CVE-2011-2501 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2011-07-17
WeaknessCWE-125

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The png_format_buffer 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 allows remote attackers to cause a denial of service (application crash) via a crafted PNG image that triggers an out-of-bounds read during the copying of error-message data. NOTE: this vulnerability exists because of a CVE-2004-0421 regression. NOTE: this is called an off-by-one error by some sources.

Timeline

dates in UTC

2011-07-1720:55CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2011-2501?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2011-2501?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Canonical ubuntu linux

Branch	Affected	Fixed in	Source
8.4	= 8.04	no fix published	NVD
10.4	= 10.04	no fix published	NVD
10.10	= 10.10	no fix published	NVD
11.4	= 11.04	no fix published	NVD

Libpng

Branch	Affected	Fixed in	Source
1.5	≥ 1.5.0, < 1.5.4	1.5.4	NVD
1.4	≥ 1.4.0, < 1.4.8	1.4.8	NVD
1.2	≥ 1.2.0, < 1.2.45	1.2.45	NVD
1.0	≥ 1.0.0, < 1.0.55	1.0.55	NVD

Debian debian linux

Branch	Affected	Fixed in	Source
5.0	= 5.0	no fix published	NVD
6.0	= 6.0	no fix published	NVD

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.16.5read 2026-10-23
NVDCVSS 2.04.3read 2026-10-23
NVDweakness (CWE)CWE-125read 2026-10-23
FIRST EPSSEPSS score3.5 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Published: 2011-07-17
Last Modified: 2026-06-16
NVD status: Modified

Frequently asked questions

What is CVE-2011-2501?

Is CVE-2011-2501 actively exploited?

Active exploitation of CVE-2011-2501 has not been confirmed. Its EPSS score was 3.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2011-2501?

CVE-2011-2501 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

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