Vulnerability Report

CVE-2025-55181

Title: Facebook Proxygen Denial of Service (DoS)

DoS

Proof Of Concept

No public PoC currently indexed for CVE-2025-55181.

CWE Category CWE-834

Published Date Dec 02, 2025

Modified Date Dec 19, 2025

Exploit Status Not Found

Score 5.3 CVSS v3.1

Exploit Probability (EPSS)

0.02%

Vulnerability Summary

CVE-2025-55181: Sending an HTTP request/response body with greater than 2^31 bytes triggers an infinite loop in proxygen::coro::HTTPQuicCoroSession which blocks the backing event loop and unconditionally appends data to a std::vector per-loop iteration. This issue leads to unbounded memory growth and eventually causes the process to run out of memory.

Impacted Vendors

proxygen_project 1

facebook 1

Reference Links

https://github.com/facebook/proxygen/commit/17689399ef99b7c3d3a8b2b768b1dba1a4b72f8f https://www.facebook.com/security/advisories/cve-2025-55181

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.3

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:L

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2025-55181 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

December 19, 2025 MODIFIED

Vulnerability data or affected products updated.

December 19, 2025 MODIFIED

Vulnerability data updated via NVD.

December 02, 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:L

Affected Stack

No specific products linked.