CVE-2025-5399

high

Description

Due to a mistake in libcurl's WebSocket code, a malicious server can send a particularly crafted packet which makes libcurl get trapped in an endless busy-loop. There is no other way for the application to escape or exit this loop other than killing the thread/process. This might be used to DoS libcurl-using application.

References

https://hackerone.com/reports/3168039

https://curl.se/docs/CVE-2025-5399.json

https://curl.se/docs/CVE-2025-5399.html

http://www.openwall.com/lists/oss-security/2025/06/04/2

Details

Source: Mitre, NVD

Published: 2025-06-07

Updated: 2025-06-09

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High

EPSS

EPSS: 0.00017