Vulnerability Report

CVE-2025-5399

Title: Haxx Curl Denial of Service (DoS)

DoS

Proof Of Concept

No public PoC currently indexed for CVE-2025-5399.

CWE Category CWE-835

Published Date Jun 07, 2025

Modified Date Jul 30, 2025

Exploit Status Not Found

Score 7.5 CVSS v3.1

Exploit Probability (EPSS)

1.29%

Vulnerability Summary

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.

Impacted Vendors

haxx 1

daniel_stenberg 1

Reference Links

https://curl.se/docs/CVE-2025-5399.html https://curl.se/docs/CVE-2025-5399.json https://hackerone.com/reports/3168039 http://www.openwall.com/lists/oss-security/2025/06/04/2

CVSS v3.1

Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0

Severity HIGH

7.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2025-5399 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

July 30, 2025 MODIFIED

Vulnerability data or affected products updated.

July 30, 2025 MODIFIED

Vulnerability data updated via NVD.

June 07, 2025 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.