Vulnerability · Published Nov 21, 2025 · Assigned by wolfSSL
CVE-2025-12889TLS 1.2 Client Can Downgrade Digest Used
Low 2.3
In plain English
A low-severity improper input validation in wolfSSL from wolfSSL. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)2.3Low
Exploit odds (30 days)0.1%top 96.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
With TLS 1.2 connections a client can use any digest, specifically a weaker digest that is supported, rather than those in the CertificateRequest.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | wolfssl | 5.9.1-r0 | ALPINE-CVE-2025-12889 |
| Alpine:v3.24 | wolfssl | 5.8.4-r0 | ALPINE-CVE-2025-12889 |
| Debian:12 | wolfssl | no fix listed | DEBIAN-CVE-2025-12889 |
| Debian:13 | wolfssl | no fix listed | DEBIAN-CVE-2025-12889 |
| Ubuntu:22.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2025-12889 |
| Ubuntu:24.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2025-12889 |
| Ubuntu:25.10 | wolfssl | no fix listed | UBUNTU-CVE-2025-12889 |
| Ubuntu:26.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2025-12889 |
| Ubuntu:26.10 | wolfssl | no fix listed | UBUNTU-CVE-2025-12889 |
Affected products (as reported)
Weakness: CWE-20 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N