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Fencer Vulns
medium 5.5

CVE-2023-2731 json

A NULL pointer dereference flaw was found in Libtiff's LZWDecode() function in the...

published 2023-05-17 3 y ago modified 2026-07-25 3 mo ago also EUVD-2023-34192 , JLSEC-2025-303

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

A NULL pointer dereference flaw was found in Libtiff's LZWDecode() function in the libtiff/tif_lzw.c file. This flaw allows a local attacker to craft specific input data that can cause the program to dereference a NULL pointer when decompressing a TIFF format file, resulting in a program crash or denial of service.

Patch / fix

  • julia Libtiff_jll 4.5.1+0
  • libtiff libtiff 4.5.0
  • tiff Debian 14, Debian 13, Debian 12 4.5.0-6

debian advisories DEBIAN-CVE-2023-2731

  • libtiff RHEL 9 4.4.0-10.el9
  • libtiff-tools RHEL 9 4.4.0-10.el9

red hat advisories RHSA-2023:6575

  • tiff SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES for SAP 15 SP1 +20 more 4.0.9-150000.45.35.1
  • tiff SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 4.0.9-44.74.1

suse advisories SUSE-SU-2023:4869-1SUSE-SU-2023:4736-1

  • libtiff AlmaLinux 9 4.4.0-10.el9
  • libtiff-tools AlmaLinux 9 4.4.0-10.el9

almalinux advisories ALSA-2023:6575

  • libtiff CBL-Mariner 2.0 4.5.0-3

azure linux advisories AZL-26756

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-2023-2731 updated cvss 5.5

libtiff: null pointer deference in LZWDecode() in libtiff/tif_lzw.c

  • Red Hat CodeReady Linux Builder (v. 9) libtiff-tools 4.4.0-10.el9 Red Hat Enterprise Linux AppStream (v. 9) libtiff 4.4.0-10.el9
    fixed: vendor fix RHSA-2023:6575
  • Red Hat Enterprise Linux 6 libtiff Red Hat Enterprise Linux 7 libtiff, libtiff-tools, compat-libtiff3 Red Hat Enterprise Linux 8 libtiff, libtiff-tools, compat-libtiff3
    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

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
21 mo ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.com https://gitlab.com/libtiff/libtiff/-/issues/548 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 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
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
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 Libtiff_jll
<4.5.1+0
4.5.1+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.