Skip to content
Fencer Vulns
medium 5.5

CVE-2021-34334 json

Denial of service due to integer overflow in loop counter

published 2021-08-09 5 y ago modified 2026-08-13 2 mo ago also EUVD-2021-20995 , JLSEC-2026-1304

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

Summary

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.

Patch / fix

  • exiv2 Debian 14, Debian 13, Debian 12 0.27.5-1

debian advisories DEBIAN-CVE-2021-34334

  • exiv2 Ubuntu 18.04 LTS 0.25-3.1ubuntu0.18.04.11
  • exiv2 Ubuntu 20.04 LTS 0.27.2-8ubuntu2.6
  • exiv2 Ubuntu 22.04 LTS 0.27.3-3ubuntu4
  • exiv2 Ubuntu Pro 16.04 LTS 0.25-2.1ubuntu16.04.7+esm4

ubuntu advisories UBUNTU-CVE-2021-34334

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • exiv2 SLE Module for Desktop Applications 15 SP7 0.27.5-150400.15.7.1
  • exiv2 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +6 more 0.23-12.18.1
  • exiv2 SLE Module for Desktop Applications 15 SP3, openSUSE Leap 15.3 0.26-150000.6.21.1
  • exiv2 SLE Module for Desktop Applications 15 SP4, openSUSE Leap 15.4 0.27.5-150400.15.4.1
  • exiv2-0_26 SLE Module for Desktop Applications 15 SP4, openSUSE Leap 15.4 0.26-150400.9.16.1

suse advisories SUSE-SU-2026:2584-1SUSE-SU-2022:4252-1SUSE-SU-2022:3892-1SUSE-SU-2022:3889-1

  • exiv2 openSUSE Tumbleweed 0.27.5-5.1

opensuse advisories openSUSE-SU-2024:12405-1

  • exiv2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 0.27.5-r0

alpine advisories ALPINE-CVE-2021-34334

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • exiv2 CBL-Mariner 2.0 0.27.5-1

azure linux advisories AZL-7215

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • exiv2 Arch Linux 0.27.5-1

arch linux advisories AVG-2265

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-34334 updated cvss 5.5

exiv2: Exiv2: Denial of Service via crafted image file

  • Red Hat Enterprise Linux 6 exiv2, exiv2-libs Red Hat Enterprise Linux 7 exiv2, exiv2-libs, compat-exiv2-023, compat-exiv2-026
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 exiv2, exiv2-libs, compat-exiv2-026
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux 9 exiv2, exiv2-libs
    affected: no fix available

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.11% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P
OSV 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia Exiv2_jll
all versions
 no fix listed

Affected products

  • Exiv2 exiv2

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.