Libtiff Write-What-Where via TIFF Height Field
CVE-2025-9900 Published on September 23, 2025

Libtiff: libtiff write-what-where
A flaw was found in Libtiff. This vulnerability is a "write-what-where" condition, triggered when the library processes a specially crafted TIFF image file. By providing an abnormally large image height value in the file's metadata, an attacker can trick the library into writing attacker-controlled color data to an arbitrary memory location. This memory corruption can be exploited to cause a denial of service (application crash) or to achieve arbitrary code execution with the permissions of the user.

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Vulnerability Analysis

CVE-2025-9900 is exploitable with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
REQUIRED
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Timeline

Reported to Red Hat.

Made public. 19 days later.

Weakness Type

Write-what-where Condition

Any condition where the attacker has the ability to write an arbitrary value to an arbitrary location, often as the result of a buffer overflow.


Products Associated with CVE-2025-9900

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2025-9900 are published in these products:

Red Hat Enterprise Linux (RHEL)
 
Libtiff
 
Canonical Ubuntu Linux
 
Red Hat Rhivos
 
Red Hat Rhel Aus
 
Red Hat Rhel Eus Long Life
 
Red Hat Rhel Els
 
Red Hat Rhel Tus
 
Red Hat Rhel E4s
 
Red Hat Rhel Eus
 
Red Hat Discovery
 
Red Hat Ai Inference Server
 
Oracle
 

Exploit Probability

EPSS
0.03%
Percentile
6.93%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.