CVE-2025-4947

MediumCVSS 6.5/10Last modified Jun 17, 2026

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 6.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Weakness enumeration

CWE-295

Affected software

Vendor	Product	Versions
curl	curl	>= 8.13.0, <= 8.13.0; >= 8.12.1, <= 8.12.1; >= 8.12.0, <= 8.12.0; >= 8.11.1, <= 8.11.1; >= 8.11.0, <= 8.11.0; >= 8.10.1, <= 8.10.1; >= 8.10.0, <= 8.10.0; >= 8.9.1, <= 8.9.1; >= 8.9.0, <= 8.9.0; >= 8.8.0, <= 8.8.0

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: May 28, 2025
Last modified: Jun 17, 2026
NVD status: Analyzed

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