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CVE-2016-9533

28
FAUCET Score

CVE-2016-9533 is a critical out-of-bounds write vulnerability affecting libtiff versions up to 4.0.6, specifically within the tif_pixarlog.c component. This flaw, also known as "PixarLog horizontalDifference heap-buffer-overflow," allows for remote code execution due to heap allocated buffer overflows. With a CVSS score of 9.8 (Critical), it presents a severe risk as it can be exploited remotely without user interaction, leading to complete compromise of confidentiality, integrity, and availability. Despite its high severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
4.0.6CPE matchmatch criteria
cpe:2.3:a:libtiff:libtiff:4.0.6:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.19%
Probability of exploitation in next 30 days
EPSS Percentile
86.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0319 is in the 78th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libtiff-0:3.9.4-21.el6_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libtiff-0:4.0.3-27.el7_3
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 7Fixed in: compat-libtiff3

Vendor Advisories (1)

redhatCVE-2016-9533Moderate

libtiff: PixarLog horizontalDifference heap-buffer-overflow

Sep 24, 2016

References

rhn.redhat.com / errata/RHSA-2017-0225.html
github.com / vadz/libtiff/commit/83a4b92815ea04969d494416eaae3d4c6b338e4a
Issue TrackingPatchThird Party Advisory
debian.org / security/2017/dsa-3762
securityfocus.com / bid/94484
Third Party AdvisoryVDB Entry
securityfocus.com / bid/94742