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Fencer Vulns
medium 6.5

CVE-2018-18661 json

An issue was discovered in LibTIFF 4.0.9.

published 2018-10-26 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-10377

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.9%
EPSS 2.9% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

An issue was discovered in LibTIFF 4.0.9. There is a NULL pointer dereference in the function LZWDecode in the file tif_lzw.c.

Patch / fix

  • tiff Debian 14, Debian 13, Debian 12 4.0.10-1

debian advisories DEBIAN-CVE-2018-18661

  • tiff Ubuntu 14.04 LTS 4.0.3-7ubuntu0.10
  • tiff Ubuntu 16.04 LTS 4.0.6-1ubuntu0.5
  • tiff Ubuntu 18.04 LTS 4.0.9-5ubuntu0.1

ubuntu advisories UBUNTU-CVE-2018-18661

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 7 4.0.3-32.el7
  • libtiff-tools RHEL 7 4.0.3-32.el7

red hat advisories RHSA-2019:2053

  • tiff SLES 12 SP4, SLES 12 SP3, SLED 12 SP4 +5 more 4.0.9-44.27.1
  • tiff SLE Module for Package Hub 15, SLE Module for Desktop Applications 15, SLE Module for Basesystem 15 4.0.9-5.17.1
  • tiff SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 3.8.2-141.169.22.1

suse advisories SUSE-SU-2018:3911-2SUSE-SU-2018:3925-1SUSE-SU-2018:3911-1SUSE-SU-2018:3879-1

  • tiff openSUSE Tumbleweed 4.3.0-1.3

opensuse advisories openSUSE-SU-2024:11461-1

  • tiff Alpine 3.24, Alpine 3.23, Alpine 3.22 +16 more 4.0.10-r0

alpine advisories ALPINE-CVE-2018-18661

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 Arch Linux 4.0.10-1
  • lib32-libtiff Arch Linux 4.0.10-1

arch linux advisories AVG-790AVG-791

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-2018-18661 updated cvss 3.3

libtiff: tiff2bw tool failed memory allocation leads to crash

  • Red Hat Enterprise Linux 5 libtiff Red Hat Enterprise Linux 6 libtiff
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) libtiff 4.0.3-32.el7 Red Hat Enterprise Linux Client Optional (v. 7) libtiff-tools 4.0.3-32.el7 Red Hat Enterprise Linux ComputeNode (v. 7) libtiff 4.0.3-32.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) libtiff-tools 4.0.3-32.el7 Red Hat Enterprise Linux Server (v. 7) libtiff 4.0.3-32.el7 Red Hat Enterprise Linux Server Optional (v. 7) libtiff-tools 4.0.3-32.el7
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) libtiff 4.0.3-32.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) libtiff-tools 4.0.3-32.el7
    fixed: vendor fix RHSA-2019:2053
  • Red Hat Enterprise Linux 7 compat-libtiff3 Red Hat Enterprise Linux 8 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

2.87% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.maptools.org http://bugzilla.maptools.org/show_bug.cgi?id=2819 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/AV:N/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

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.