Improper Input Validation in wolfSSL Affects Signature Algorithm Negotiation
CVE-2025-11934

2.1LOW

Key Information:

Vendor

Wolfssl

Status
Wolfssl
Vendor
CVE Published:
21 November 2025

What is CVE-2025-11934?

A vulnerability in wolfSSL versions 5.8.2 and earlier allows for improper input validation during the negotiation of the TLS 1.3 CertificateVerify signature algorithm. This flaw can lead to a downgrade of the signature algorithm. For instance, if a client indicates support for ECDSA P521, the server may erroneously revert to ECDSA P256 if it accepts that as a response. This situation can compromise the intended security measures during TLS handshake processes, posing risks to data integrity.

Affected Version(s)

wolfSSL Linux v5.8.2

References

https://github.com/wolfSSL/wolfssl
https://github.com/wolfSSL/wolfssl/pull/9113

CVSS V4

Score:
2.1
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jaehun Lee, Pohang University of Science and Technology (POSTECH)
Kyungmin Bae, Pohang University of Science and Technology (POSTECH)
JSON
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CVE-2025-11934 : Improper Input Validation in wolfSSL Affects Signature Algorithm Negotiation