What’s Vulnerable › Vulnerabilities

CVE-2025-4947: QUIC certificate check skip with wolfSSL

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-05-28 · updated 2026-06-17
• Weakness: CWE-295

Description

libcurl accidentally skips the certificate verification for QUIC connections when connecting to a host specified as an IP address in the URL. Therefore, it does not detect impostors or man-in-the-middle attacks.

Affected products

• curl: from 8.8.0 before 8.14.0 — fixed in 8.14.0

How to fix

Upgrade to a fixed version: curl 8.14.0. Check the vendor advisory for mitigations.

References

• https://curl.se/docs/CVE-2025-4947.html
• https://curl.se/docs/CVE-2025-4947.json
• https://hackerone.com/reports/3150884
• http://www.openwall.com/lists/oss-security/2025/05/28/4

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