Heap-based buffer overflow in GnuTLS - CVE-2025-32989
Published: July 16, 2025
Vulnerability identifier: #VU112992
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2025-32989
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: GnuTLS
Affected software:
GnuTLS
GnuTLS
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when handling the Certificate Transparency (CT) Signed Certificate Timestamp (SCT) extension during X.509 certificate parsing. A remote attacker can supply a specially crafted X.509 certificate to the application, trigger a heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
How to mitigate CVE-2025-32989
Install updates from vendor's website.