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Fencer Vulns
high 7.8

CVE-2020-35524 json

A heap-based buffer overflow flaw was found in libtiff in the handling of TIFF images in libtiff's...

published 2021-03-09 5 y ago modified 2026-07-23 3 mo ago also EUVD-2020-23191 , JLSEC-2025-258

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

A heap-based buffer overflow flaw was found in libtiff in the handling of TIFF images in libtiff's TIFF2PDF tool. A specially crafted TIFF file can lead to arbitrary code execution. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Patch / fix

  • julia Libtiff_jll 4.3.0+0
  • libtiff libtiff 4.2.0
  • tiff Debian 14, Debian 13, Debian 12 4.1.0+git201212-1

debian advisories DEBIAN-CVE-2020-35524

  • tiff Ubuntu 16.04 LTS 4.0.6-1ubuntu0.8
  • tiff Ubuntu 18.04 LTS 4.0.9-5ubuntu0.4
  • tiff Ubuntu 20.04 LTS 4.1.0+git191117-2ubuntu0.20.04.1
  • tiff Ubuntu Pro 14.04 LTS 4.0.3-7ubuntu0.11+esm6

ubuntu advisories UBUNTU-CVE-2020-35524

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

  • libtiff RHEL 8 4.0.9-20.el8
  • libtiff-tools RHEL 8 4.0.9-20.el8

red hat advisories RHSA-2021:4241

  • tiff SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 3.8.2-141.169.34.1
  • tiff SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +11 more 4.0.9-44.45.1
  • tiff SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES for SAP 15 +21 more 4.0.9-45.5.1

suse advisories SUSE-SU-2022:14888-1SUSE-SU-2022:0496-1SUSE-SU-2022:0480-1

  • tiff openSUSE Tumbleweed 4.6.0-2.1
  • tiff openSUSE Leap 15.3 4.0.9-45.5.1

opensuse advisories openSUSE-SU-2024:13381-1openSUSE-SU-2022:0480-1

  • libtiff AlmaLinux 8 4.0.9-20.el8
  • libtiff-tools AlmaLinux 8 4.0.9-20.el8

almalinux advisories ALSA-2021:4241

  • libtiff Rocky Linux 8 4.0.9-20.el8

rocky linux advisories RLSA-2021:4241

  • tiff Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 4.2.0-r0

alpine advisories ALPINE-CVE-2020-35524

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

  • libtiff CBL-Mariner 2.0 4.1.0-3

azure linux advisories AZL-6655

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

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-2020-35524 updated cvss 7.8

libtiff: Heap-based buffer overflow in TIFF2PDF tool

  • Red Hat Enterprise Linux 6 libtiff
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 libtiff, libtiff-tools, compat-libtiff3 Red Hat Enterprise Linux 8 mingw-libtiff, compat-libtiff3, mingw32-libtiff, mingw64-libtiff
    affected: no fix planned “Will not fix”
  • Red Hat CodeReady Linux Builder (v. 8) libtiff 4.0.9-20.el8, libtiff-tools 4.0.9-20.el8 Red Hat Enterprise Linux AppStream (v. 8) libtiff 4.0.9-20.el8, libtiff-tools 4.0.9-20.el8
    fixed: vendor fix RHSA-2021:4241
  • Red Hat Enterprise Linux 9 libtiff, libtiff-tools
    not affected: vulnerable code not present

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

1.85% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P
OSV 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
julia Libtiff_jll
<4.3.0+0
4.3.0+0

Affected products

  • n/a libtiff

Classification

Weakness

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.