Vulnerability · Published Jan 27, 2026 · Assigned by openssl
CVE-2025-15468NULL dereference in SSL_CIPHER_find() function on unknown cipher ID
Medium 5.9
In plain English
A medium-severity null pointer dereference in OpenSSL from OpenSSL. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | openssl | 1:3.5.1-7.el10_1.alma.1 | ALSA-2026:1472 |
| AlmaLinux:9 | openssl | 1:3.5.1-7.el9_7 | ALSA-2026:1473 |
| AlmaLinux:10 | openssl-devel | 1:3.5.1-7.el10_1.alma.1 | ALSA-2026:1472 |
| AlmaLinux:9 | openssl-devel | 1:3.5.1-7.el9_7 | ALSA-2026:1473 |
| AlmaLinux:10 | openssl-libs | 1:3.5.1-7.el10_1.alma.1 | ALSA-2026:1472 |
| AlmaLinux:9 | openssl-libs | 1:3.5.1-7.el9_7 | ALSA-2026:1473 |
| AlmaLinux:10 | openssl-perl | 1:3.5.1-7.el10_1.alma.1 | ALSA-2026:1472 |
| AlmaLinux:9 | openssl-perl | 1:3.5.1-7.el9_7 | ALSA-2026:1473 |
| Alpine:v3.20 | openssl | 3.3.6-r0 | ALPINE-CVE-2025-15468 |
| Alpine:v3.21 | openssl | 3.3.6-r0 | ALPINE-CVE-2025-15468 |
| Alpine:v3.22 | openssl | 3.5.5-r0 | ALPINE-CVE-2025-15468 |
| Alpine:v3.23 | openssl | 3.5.5-r0 | ALPINE-CVE-2025-15468 |
| Alpine:v3.24 | openssl | 3.5.5-r0 | ALPINE-CVE-2025-15468 |
| Debian:13 | openssl | 3.5.4-1~deb13u2 | DEBIAN-CVE-2025-15468 |
| Debian:14 | openssl | 3.5.5-1 | DEBIAN-CVE-2025-15468 |
| Rocky Linux:10 | openssl | 1:3.5.1-7.el10_1 | RLSA-2026:1472 |
| Rocky Linux:9 | openssl | 1:3.5.1-7.el9_7 | RLSA-2026:1473 |
| Ubuntu:22.04:LTS | openssl | 3.0.2-0ubuntu1.21 | USN-7980-1 |
| Ubuntu:24.04:LTS | openssl | 3.0.13-0ubuntu3.7 | USN-7980-1 |
| Ubuntu:25.10 | openssl | 3.5.3-1ubuntu3 | USN-7980-1 |
| Ubuntu:25.10 | openssl | 3.5.3-1ubuntu3 | UBUNTU-CVE-2025-15468 |
| Ubuntu:26.04:LTS | openssl | 3.5.5-1ubuntu1 | UBUNTU-CVE-2025-15468 |
Affected products (as reported)
Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- OpenSSL Advisory vendor-advisory
- 3.6.1 git commit patch
- 3.5.5 git commit patch
- 3.4.4 git commit patch
- 3.3.6 git commit patch