CVE-2025-4947
MEDIUMCVSS 6.5/10EPSS 0.24%
Last modified
CVE-2025-4947 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 0.24% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Haxx | Curl | >= 8.8.0, < 8.14.0 |
References
- https://curl.se/docs/CVE-2025-4947.htmlPatch, Vendor Advisory
- https://curl.se/docs/CVE-2025-4947.jsonVendor Advisory
- https://hackerone.com/reports/3150884Exploit, Issue Tracking, Patch
- http://www.openwall.com/lists/oss-security/2025/05/28/4Mailing List, Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2025-4947?
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.
How severe is CVE-2025-4947?
CVE-2025-4947 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.24% probability of exploitation in the next 30 days.
How do I fix CVE-2025-4947?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2025-4947?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST