BaseFortify

Publication date: 2025-11-21

Last updated on: 2025-12-03

Assigner: wolfSSL Inc.

Description

Improper input validation in the TLS 1.3 CertificateVerify signature algorithm negotiation in wolfSSL 5.8.2 and earlier on multiple platforms allows for downgrading the signature algorithm used. For example when a client sends ECDSA P521 as the supported signature algorithm the server previously could respond as ECDSA P256 being the accepted signature algorithm and the connection would continue with using ECDSA P256, if the client supports ECDSA P256.

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Meta Information

Published

2025-11-21

Last Modified

2025-12-03

Generated

2026-07-06

AI Q&A

2025-11-22

EPSS Evaluated

2026-07-05

NVD

CVE-2025-11934

Affected Vendors & Products

Vendor	Product	Version / Range
wolfssl	wolfssl	From 5.8.2 (inc) to 5.8.4 (exc)
apple	macos	*
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-20	The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Attack-Flow Graph

Executive Summary

This vulnerability is an improper input validation issue in the TLS 1.3 CertificateVerify signature algorithm negotiation in wolfSSL version 5.8.2 and earlier. It allows an attacker to downgrade the signature algorithm used during the TLS handshake. For example, if a client supports ECDSA P521 but the server responds with ECDSA P256, the connection will continue using the weaker ECDSA P256 algorithm, potentially reducing the security of the connection.

Impact Analysis

This vulnerability can impact you by allowing an attacker to force the use of a weaker signature algorithm during the TLS handshake, which may reduce the overall security of the encrypted connection. This downgrade could make it easier for an attacker to compromise the integrity or authenticity of the communication.

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