CVE-2025-11934

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.

CVSS v3.1 Score

2.7

LOW

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

Weakness Type (CWE)

CWE-20 Improper Input Validation

Affected Products

Vendor	Product	Versions
wolfssl	wolfssl	5.8.2 — 5.8.4
apple	macos	All
linux	linux_kernel	All

References

Advisories & Patches

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

Other References

https://github.com/wolfSSL/wolfssl

Frequently Asked Questions

What is CVE-2025-11934? +

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. It has a CVSS v3.1 base score of 2.7 (LOW).

How severe is CVE-2025-11934? +

CVE-2025-11934 has a CVSS v3.1 score of 2.7 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

What products are affected by CVE-2025-11934? +

CVE-2025-11934 affects products from apple, linux, wolfssl, specifically: linux_kernel, macos, wolfssl. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-11934? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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