CVE-2025-4947

Public Exploit
QUIC certificate check skip with wolfSSL

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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.01%
Vendor Advisory curl.se Vendor Advisory curl.se
Affected: curl curl
Published at:
Updated at:

References

Link Tags
https://curl.se/docs/CVE-2025-4947.json vendor advisory
https://curl.se/docs/CVE-2025-4947.html patch vendor advisory
https://hackerone.com/reports/3150884 patch exploit issue tracking
http://www.openwall.com/lists/oss-security/2025/05/28/4 mailing list patch third party advisory

Frequently Asked Questions

What is the severity of CVE-2025-4947?
CVE-2025-4947 has been scored as a medium severity vulnerability.
How to fix CVE-2025-4947?
To fix CVE-2025-4947, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-4947 being actively exploited in the wild?
It is possible that CVE-2025-4947 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-4947?
CVE-2025-4947 affects curl curl.
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