CVE-2025-32989
MediumCVSS 5.3Exploitation Probability (EPSS)
Elevated risk67th percentile - higher than 67% of all known CVEs
Summary
A heap-buffer-overread vulnerability was found in GnuTLS when handling the Certificate Transparency (CT) Signed Certificate Timestamp (SCT) extension during X.509 certificate parsing. This flaw allows an attacker to create a certificate with a malformed SCT extension (OID 1.3.6.1.4.1.11129.2.4.2) that may contain sensitive data. As a result, confidential information may be exposed when GnuTLS verifies certificates from certain websites if the SCT is not checked correctly.
Risk Assessment
The organization is at risk of leaking confidential data when GnuTLS verifies certificates from specific websites and the SCT extension is not properly validated. This could lead to unauthorized disclosure of sensitive information.
Recommendation
Immediately update the GnuTLS library to a version that fixes this vulnerability. Until the update is applied, consider limiting trust in certificates with malformed SCT extensions.
Other vulnerabilities in GnuTLS
See all- CVE-2016-4456High
The 'GNUTLS_KEYLOGFILE' environment variable in gnutls 3.4.12 allows remote attackers to overwrite and corrupt arbitrary files in the filesystem.
- CVE-2017-7507High
GnuTLS version 3.5.12 and earlier is vulnerable to a NULL pointer dereference while decoding a status response TLS extension with valid contents. This could lead to a crash of the GnuTLS server application.
- CVE-2017-7869High
GnuTLS before February 20, 2017, has an out-of-bounds write caused by an integer overflow and heap-based buffer overflow related to the cdk_pkt_read function in opencdk/read-packet.c. This issue is a subset of the vendor's GNUTLS-SA-2017-3 report and is fixed in version 3.5.10.
- CVE-2017-5335High
The stream reading functions in lib/opencdk/read-packet.c in GnuTLS before 3.3.26 and 3.5.x before 3.5.8 allow remote attackers to cause a denial of service (out-of-memory error and crash) via a crafted OpenPGP certificate.
- CVE-2016-7444High
The gnutls_ocsp_resp_check_crt function in GnuTLS before 3.4.15 and 3.5.x before 3.5.4 does not verify the serial length of an OCSP response, which might allow remote attackers to bypass an intended certificate validation mechanism.
- CVE-2015-3308High
A double free vulnerability in lib/x509/x509_ext.c in GnuTLS before version 3.3.14 allows remote attackers to cause a denial of service or possibly have unspecified other impact via a crafted CRL distribution point.
- CVE-2024-28834Medium
A flaw was found in GnuTLS related to the Minerva attack, a cryptographic vulnerability that exploits deterministic behavior, leading to side-channel leaks. In specific scenarios, such as using the GNUTLS_PRIVKEY_FLAG_REPRODUCIBLE flag, it can result in a noticeable step in nonce values.
- CVE-2017-5337Critical
Multiple heap-based buffer overflows in the read_attribute function in GnuTLS before 3.3.26 and 3.5.x before 3.5.8 allow remote attackers to have unspecified impact via a crafted OpenPGP certificate.
- CVE-2017-5336Critical
A stack-based buffer overflow in the cdk_pk_get_keyid function in lib/opencdk/pubkey.c in GnuTLS before 3.3.26 and 3.5.x before 3.5.8 allows remote attackers to have unspecified impact via a crafted OpenPGP certificate.
- CVE-2017-5334Critical
A double free vulnerability in the gnutls_x509_ext_import_proxy function in GnuTLS before 3.3.26 and 3.5.x before 3.5.8 allows remote attackers to have unspecified impact via crafted policy language information in an X.509 certificate with a Proxy Certificate Information extension.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS