5.9

CVE-2025-15468: NULL dereference in SSL_CIPHER_find() function on unknown cipher ID

Analyzed
AliasesALPINE-CVE-2025-15468UBUNTU-CVE-2025-15468DEBIAN-CVE-2025-15468
Published 27-01-2026Last modified 29-01-2026

Vulnerability summary

CVE-2025-15468 is a medium (CVSS 5.9) NULL Pointer Dereference vulnerability in openssl. EPSS estimates a 0.82% chance of exploitation in the next 30 days, higher than 57.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.9/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.82%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 13 · Related 11
OPENSUSE-SU-2026:10237-1OPENSUSE-SU-2026:20152-1RHSA-2026:1472RHSA-2026:1473RHSA-2026:7261SUSE-SU-2026:20211-1

Timeline

  1. 27-01-2026
    PublishedVulnerability first disclosed.
  2. 29-01-2026
    Last modifiedVulnerability information updated.

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 metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.82%

Chance of exploitation in the next 30 days

Percentile

57%

Versus all other CVEs

30-day change

Decrease -0.01 pp

From 0.83% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard8 products
  • libcrypto3-2.34< 3.6.1-r0
  • openssl< 3.6.1-r0
  • openssl-3.5< 3.5.5-r0
  • openssl-3.5-libcrypto< 3.5.5-r0
  • openssl-3.5-libssl< 3.5.5-r0
Ubuntu2 products
  • nodejsAll versions (No fix recorded)
  • openssl< 3.5.3-1ubuntu3 | < 3.5.5-1ubuntu1
Alpine1 product
  • openssl≥ 3.3.0, < 3.3.6-r0 | ≥ 3.3.0, < 3.5.5-r0
Debian1 product
  • openssl< 3.5.4-1~deb13u2 | < 3.5.5-1
Openssl1 product
  • openssl≥ 3.3.0, < 3.3.6 | ≥ 3.4.0, < 3.4.4 | ≥ 3.5.0, < 3.5.5 | ≥ 3.6.0, < 3.6.1
Wolfi1 product
  • openssl< 3.6.1-r0

6 vendors · 14 products

References

12 links
Show all 12 references