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CVE-2018-18661

24
FAUCET Score

CVE-2018-18661 is a NULL pointer dereference vulnerability found in LibTIFF version 4.0.9, specifically within the LZWDecode function in tif_lzw.c, affecting various Canonical and LibTIFF products. This medium-severity vulnerability, rated 6.5 CVSSv3, can be triggered remotely with low attack complexity, requiring user interaction, and could lead to a denial of service. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
4.0.9CPE matchmatch criteria
cpe:2.3:a:libtiff:libtiff:4.0.9:*:*:*:*:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
18.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
18.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.87%
Probability of exploitation in next 30 days
EPSS Percentile
85.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0287 is in the 93rd percentile among its peer group of 26,221 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libtiff-0:4.0.3-32.el7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: libtiff
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libtiff

Vendor Advisories (1)

redhatCVE-2018-18661Low

libtiff: tiff2bw tool failed memory allocation leads to crash

Oct 25, 2018

References

bugzilla.maptools.org / show_bug.cgi
ExploitIssue TrackingPatchThird Party Advisory
access.redhat.com / errata/RHSA-2019:2053
lists.debian.org / debian-lts-announce/2019/11/msg00027.html
usn.ubuntu.com / 3864-1
Third Party Advisory
securityfocus.com / bid/105762
Third Party AdvisoryVDB Entry