← Vulnerability feed

Vulnerability record · CVE-2021-40633 · published 14 June 2022

CVE-2021-40633: Giflib project giflib memory leak vulnerability

GGiflib Project · Giflib

A memory leak (out-of-memory) in gif2rgb in util/gif2rgb.c in giflib 5.1.4 allows remote attackers trigger an out of memory exception or denial of service via a gif format file.

8.8 CVSS 3.1 High EPSS 1.7% · top 23.5% CWE-401 · Memory leak
8.8CVSS 3.1 base score, v2 5.1
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A memory leak (out-of-memory) in gif2rgb in util/gif2rgb.c in giflib 5.1.4 allows remote attackers trigger an out of memory exception or denial of service via a gif format file.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://sourceforge.net/p/giflib/bugs/157/ ExploitIssue TrackingThird Party Advisory
https://sourceforge.net/p/giflib/bugs/157/ ExploitIssue TrackingThird Party Advisory

Track CVE-2021-40633 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2016-3177Giflib project giflib double free vulnerabilityMultiple use-after-free and double-free vulnerabilities in gifcolor.c in GIFLIB 5.1.2 have unspecified impact and attack vectors.EPSS 1.6%8.8CVE-2018-11489Giflib project giflib out-of-bounds write vulnerabilityThe DGifDecompressLine function in dgif_lib.c in GIFLIB (possibly version 3.0.x), as later shipped in cgif.c in sam2p 0.49.4, has a heap-based buffer…EPSS 2.6%8.8CVE-2018-11490Giflib project giflib out-of-bounds write vulnerabilityThe DGifDecompressLine function in dgif_lib.c in GIFLIB (possibly version 3.0.x), as later shipped in cgif.c in sam2p 0.49.4, has a heap-based buffer…EPSS 2.4%8.2CVE-2026-26740Giflib project giflib out-of-bounds write vulnerabilityBuffer Overflow vulnerability in giflib v.5.2.2 allows a remote attacker to cause a denial of service via the EGifGCBToExtension overwriting an exist…EPSS 1.0%7.1CVE-2023-48161Giflib project giflib out-of-bounds write vulnerabilityBuffer Overflow vulnerability in GifLib Project GifLib v.5.2.1 allows a local attacker to obtain sensitive information via the DumpSCreen2RGB functio…EPSS 0.43%7.1CVE-2020-23922Giflib project giflib out-of-bounds read vulnerabilityAn issue was discovered in giflib through 5.1.4. DumpScreen2RGB in gif2rgb.c has a heap-based buffer over-read.EPSS 2.2%6.5CVE-2024-45993Giflib project giflib out-of-bounds write vulnerabilityGiflib Project v5.2.2 is vulnerable to a heap buffer overflow via gif2rgb.EPSS 0.44%6.5CVE-2019-15133Giflib project giflib divide by zero vulnerabilityIn GIFLIB before 2019-02-16, a malformed GIF file triggers a divide-by-zero exception in the decoder function DGifSlurp in dgif_lib.c if the height f…EPSS 1.5%

Source: NIST National Vulnerability Database (record CVE-2021-40633), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.