CVE-2025-15468

MEDIUM EPSS 50.3%
Published Jan 27, 20265mo ago · Modified Jun 17, 20261w ago
5.9 CVSS 3.1
Medium
Find Similar
Published Jan 27, 2026 5mo ago
Last Modified Jun 17, 2026 1w ago

Description

Issue summary: If an application using the SSL_CIPHER_find() function in a QUIC protocol client or server receives an unknown cipher suite from the peer, a NULL dereference occurs. Impact summary: A NULL pointer dereference leads to abnormal termination of the running process causing Denial of Service. Some applications call SSL_CIPHER_find() from the client_hello_cb callback on the cipher ID received from the peer. If this is done with an SSL object implementing the QUIC protocol, NULL pointer dereference will happen if the examined cipher ID is unknown or unsupported. As it is not very common to call this function in applications using the QUIC protocol and the worst outcome is Denial of Service, the issue was assessed as Low severity. The vulnerable code was introduced in the 3.2 version with the addition of the QUIC protocol support. The FIPS modules in 3.6, 3.5, 3.4 and 3.3 are not affected by this issue, as the QUIC implementation is outside the OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4 and 3.3 are vulnerable to this issue. OpenSSL 3.0, 1.1.1 and 1.0.2 are not affected by this issue.

CVSS Details

Base Score
5.9
Exploitability
2.2
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
50.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 4

VendorProductVersionRange
opensslopenssl*≥3.3.0  –  <3.3.6
opensslopenssl*≥3.4.0  –  <3.4.4
opensslopenssl*≥3.5.0  –  <3.5.5
opensslopenssl*≥3.6.0  –  <3.6.1

References 5

  • github.com https://github.com/openssl/openssl/commit/1f08e54bad32843044fe8a675948d65e3b4ece65
    Patch
  • github.com https://github.com/openssl/openssl/commit/7c88376731c589ee5b36116c5a6e32d5ae5f7ae2
    Patch
  • github.com https://github.com/openssl/openssl/commit/b2539639400288a4580fe2d76247541b976bade4
    Patch
  • github.com https://github.com/openssl/openssl/commit/d75b309879631d45b972396ce4e5102559c64ac7
    Patch
  • openssl-library.org https://openssl-library.org/news/secadv/20260127.txt
    Vendor Advisory

Remediation

  • github.com https://github.com/openssl/openssl/commit/1f08e54bad32843044fe8a675948d65e3b4ece65
    Patch
  • github.com https://github.com/openssl/openssl/commit/7c88376731c589ee5b36116c5a6e32d5ae5f7ae2
    Patch
  • github.com https://github.com/openssl/openssl/commit/b2539639400288a4580fe2d76247541b976bade4
    Patch
  • github.com https://github.com/openssl/openssl/commit/d75b309879631d45b972396ce4e5102559c64ac7
    Patch