CVE-2021-34334: Denial of service due to integer overflow in loop counter

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-08-09 · updated 2026-06-17
Weakness: CWE-835

Description

Exiv2 is a command-line utility and C++ library for reading, writing, deleting, and modifying the metadata of image files. An infinite loop is triggered when Exiv2 is used to read the metadata of a crafted image file. An attacker could potentially exploit the vulnerability to cause a denial of service, if they can trick the victim into running Exiv2 on a crafted image file. The bug is fixed in version v0.27.5.

Affected products

Debian Linux: 10.0
exiv2: through 0.27.4
Fedoraproject Fedora: 33, 34

References

https://github.com/Exiv2/exiv2/pull/1766
https://github.com/Exiv2/exiv2/security/advisories/GHSA-hqjh-hpv8-8r9p
https://lists.debian.org/debian-lts-announce/2023/01/msg00004.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FMDT4PJB7P43WSOM3TRQIY3J33BAFVVE/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UYGDELIFFJWKUU7SO3QATCIXCZJERGAC/
https://security.gentoo.org/glsa/202312-06
https://github.com/Exiv2/exiv2/pull/1766
https://github.com/Exiv2/exiv2/security/advisories/GHSA-hqjh-hpv8-8r9p
https://lists.debian.org/debian-lts-announce/2023/01/msg00004.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FMDT4PJB7P43WSOM3TRQIY3J33BAFVVE/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UYGDELIFFJWKUU7SO3QATCIXCZJERGAC/
https://security.gentoo.org/glsa/202312-06

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