Heap-Buffer-Overread Vulnerability in GnuTLS Affecting X.509 Certificate Processing
CVE-2025-32989

5.3MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
10 July 2025

What is CVE-2025-32989?

A heap-buffer-overread vulnerability was discovered in GnuTLS, specifically during the parsing of X.509 certificates that include the Certificate Transparency (CT) Signed Certificate Timestamp (SCT) extension. This flaw allows attackers to craft certificates with malformed SCT extensions containing sensitive data. If GnuTLS processes these improperly validated certificates, it may expose confidential information, particularly when the SCT is not correctly verified. This scenario represents a significant risk when handling certificates from certain websites.

References

https://access.redhat.com/security/cve/CVE-2025-32989
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2359621
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2025-32989 : Heap-Buffer-Overread Vulnerability in GnuTLS Affecting X.509 Certificate Processing