Write-what-where Condition (CVE-2025-9900)
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.
AI Analysis
Technical Summary
The libtiff library contained a Write-What-Where vulnerability (CVE-2025-9900) that could allow an attacker to write arbitrary data to arbitrary locations in memory. Red Hat Product Security released an advisory (RHSA-2025:21506) with updated libtiff packages for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions across several architectures (ppc64le, x86_64, aarch64, s390x). The advisory classifies the security impact as important. The vulnerability is tracked under CWE-123. No CVSS base score is provided in the advisory or CVE data.
Potential Impact
The vulnerability allows a Write-What-Where condition, which can lead to arbitrary memory writes. This type of flaw can potentially be exploited to execute arbitrary code or cause denial of service, depending on the context of the library usage. Red Hat rates the impact as important, indicating a significant security risk if unpatched.
Mitigation Recommendations
Red Hat has released updated libtiff packages that fix this vulnerability. Users of Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions should apply the provided security update (libtiff-4.2.0-3.el9_0.2) as detailed in Red Hat advisory RHSA-2025:21506 and the linked update instructions (https://access.redhat.com/articles/11258). Applying this update mitigates the vulnerability. There is no indication that additional mitigations are required beyond applying the official patch.
Write-what-where Condition (CVE-2025-9900)
Description
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.
CVSS v3.1
Score 8.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The libtiff library contained a Write-What-Where vulnerability (CVE-2025-9900) that could allow an attacker to write arbitrary data to arbitrary locations in memory. Red Hat Product Security released an advisory (RHSA-2025:21506) with updated libtiff packages for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions across several architectures (ppc64le, x86_64, aarch64, s390x). The advisory classifies the security impact as important. The vulnerability is tracked under CWE-123. No CVSS base score is provided in the advisory or CVE data.
Potential Impact
The vulnerability allows a Write-What-Where condition, which can lead to arbitrary memory writes. This type of flaw can potentially be exploited to execute arbitrary code or cause denial of service, depending on the context of the library usage. Red Hat rates the impact as important, indicating a significant security risk if unpatched.
Mitigation Recommendations
Red Hat has released updated libtiff packages that fix this vulnerability. Users of Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions should apply the provided security update (libtiff-4.2.0-3.el9_0.2) as detailed in Red Hat advisory RHSA-2025:21506 and the linked update instructions (https://access.redhat.com/articles/11258). Applying this update mitigates the vulnerability. There is no indication that additional mitigations are required beyond applying the official patch.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2025:21506
- Cve Count
- 1
Threat ID: 6a3cc2984853345fc16d1c4f
Added to database: 06/25/2026, 05:54:32 UTC
Last enriched: 06/25/2026, 06:33:33 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 27
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