CVE-2025-5399

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://curl.se/docs/CVE-2025-5399.html	Vendor Advisory
https://curl.se/docs/CVE-2025-5399.json	Vendor Advisory
https://hackerone.com/reports/3168039	Exploit Issue Tracking Third Party Advisory
http://www.openwall.com/lists/oss-security/2025/06/04/2	Mailing List Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2025-06-07 08:15

Updated : 2025-07-30 19:41

NVD link : CVE-2025-5399

Mitre link : CVE-2025-5399

CVE.ORG link : CVE-2025-5399

JSON object : View

Products Affected

haxx

curl

CWE

CWE-835

Loop with Unreachable Exit Condition ('Infinite Loop')

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