Information disclosure via unchecked SCT length
Published Jul 10, 2025 · Updated Sep 1, 2026
Heap-buffer over-read in GnuTLS before 3.8.10 allows remote attackers to disclose process memory via a malformed certificate SCT extension. In gnutls_x509_ext_ct_import_scts, the parser trusted a two-byte SCT list length without checking it against the decoded extension buffer size before _gnutls_parse_ct_sct read onward. Exposure requires an application to parse an attacker-controlled X.509 certificate containing the SCT extension, and the consequence is limited to reading adjacent heap data.
Summary
What happened
Heap-buffer over-read in GnuTLS before 3.8.10 allows remote attackers to disclose process memory via a malformed certificate SCT extension. In gnutls_x509_ext_ct_import_scts, the parser trusted a two-byte SCT list length without checking it against the decoded extension buffer size before _gnutls_parse_ct_sct read onward. Exposure requires an application to parse an attacker-controlled X.509 certificate containing the SCT extension, and the consequence is limited to reading adjacent heap data.
The record
- CVE
- CVE-2025-32989
- Published
- Jul 10, 2025
- Updated
- Sep 1, 2026
- Vendor
- Siemens
- Product
- SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
- Classifications
- CWE-295
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 10, 2025CVE publishedPublication date reported by the CVE source.
- Sep 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=V3.1.5 <*
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What is affected?
Published CVSS scores
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Attacks
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