GnuTLS certificate validation

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in GnuTLS. This impacts an unknown function of the component Certificate Transparency Signed Certificate Timestamp Extension. Executing a manipulation can lead to certificate validation. This vulnerability is registered as CVE-2025-32989. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability has been found in GnuTLS (affected version not known) and classified as problematic. This vulnerability affects some unknown functionality of the component Certificate Transparency Signed Certificate Timestamp Extension. The manipulation with an unknown input leads to a certificate validation vulnerability. The CWE definition for the vulnerability is CWE-295. The product does not validate, or incorrectly validates, a certificate. As an impact it is known to affect confidentiality. CVE summarizes:

A heap-buffer-overread vulnerability was found in GnuTLS in how it handles the Certificate Transparency (CT) Signed Certificate Timestamp (SCT) extension during X.509 certificate parsing. This flaw allows a malicious user to create a certificate containing a malformed SCT extension (OID 1.3.6.1.4.1.11129.2.4.2) that contains sensitive data. This issue leads to the exposure of confidential information when GnuTLS verifies certificates from certain websites when the certificate (SCT) is not checked correctly.

The advisory is shared for download at access.redhat.com. This vulnerability was named CVE-2025-32989 since 04/15/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1587.003.

The vulnerability scanner Nessus provides a plugin with the ID 242043 (Fedora 42 : gnutls (2025-16a24364ce)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (242043), EUVD (EUVD-2025-20927) and CERT Bund (WID-SEC-2025-1526). Once again VulDB remains the best source for vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Fedora Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • Gentoo Linux
  • IBM Storwize
  • RESF Rocky Linux
  • IBM App Connect Enterprise
  • IBM MQ
  • Open Source GnuTLS
  • Dell Secure Connect Gateway
  • IBM QRadar SIEM
  • Meinberg LANTIME

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (redhat): 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Certificate validation
CWE: CWE-295 / CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 242043
Nessus Name: Fedora 42 : gnutls (2025-16a24364ce)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

04/15/2025 🔍
07/10/2025 +86 days 🔍
07/10/2025 +0 days 🔍
11/28/2025 +141 days 🔍

Sourcesinfo

Advisory: access.redhat.com
Status: Not defined

CVE: CVE-2025-32989 (🔍)
GCVE (CVE): GCVE-0-2025-32989
GCVE (VulDB): GCVE-100-315940
EUVD: 🔍
CERT Bund: WID-SEC-2025-1526 - GnuTLS: Mehrere Schwachstellen

Entryinfo

Created: 07/10/2025 10:21
Updated: 11/28/2025 10:34
Changes: 07/10/2025 10:21 (61), 07/10/2025 14:59 (1), 07/11/2025 01:36 (1), 07/13/2025 14:09 (2), 10/10/2025 11:12 (7), 10/31/2025 14:07 (1), 11/28/2025 10:34 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

Discussion

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