Medium severity · published Nov 21, 2025
CVE-2025-12889
TLS 1.2 Client Can Downgrade Digest Used
5.4
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WO
wolfSSL · wolfSSL
before 5.8.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-12889
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-12889
Issue Tracking
https://github.com/wolfSSL/wolfssl/pull/9395
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