How severe is CVE-2025-11934?

CVE-2025-11934 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2025-11934 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-11934?

CVE-2025-11934 affects Wolfssl. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-11934?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-11934 have an EU (EUVD) identifier?

Yes. CVE-2025-11934 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198527.

When was CVE-2025-11934 published?

CVE-2025-11934 was published on 2025-11-21 and last updated on 2026-06-17.

CVE-2025-11934

CVE-2025-11934 is a low-severity vulnerability in Wolfssl with a CVSS 3.x base score of 2.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Low (CVSS 3.x base score 2.7)
CVSS v4: 2.1
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-198527
Weakness: CWE-20
Affected product: Wolfssl
Published: 2025-11-21
Last modified: 2026-06-17

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.

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.
How severe is CVE-2025-11934?: CVE-2025-11934 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2025-11934 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-11934?: CVE-2025-11934 affects Wolfssl. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-11934?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-11934 have an EU (EUVD) identifier?: Yes. CVE-2025-11934 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198527.
When was CVE-2025-11934 published?: CVE-2025-11934 was published on 2025-11-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*

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