CVE-2025-1866CWE-119

Undefined Behavior Due to Out-of-Bounds Pointer Arithmetic in libwebsockets

Critical · published March 3, 2025

CVSS v4.0
10.0
EPSS
0%
Percentile
36.7
In the wild
Unconfirmed
What it is

Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in warmcat libwebsockets allows Pointer Manipulation, potentially leading to out-of-bounds memory access. This issue affects libwebsockets before 4.3.4 and is present in code built specifically for the Win32 platform.

By default, the affected code is not executed unless one of the following conditions is met:

LWS_WITHOUT_EXTENSIONS (default ON) is manually set to OFF in CMake.

LWS_WITH_HTTP_STREAM_COMPRESSION (default OFF) is manually set to ON in CMake.

Despite these conditions, when triggered in affected configurations, this vulnerability may allow attackers to manipulate pointers, potentially leading to memory corruption or unexpected behavior.

The record
Technical detail
CVSS v4.0
10.0 · CRITICAL
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
EPSS
0.00434 · 36.7th percentile
Weakness
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer
Published
2025-03-03T08:44Z
EPSS history
Timeline
  • 03 MAR 08:44Z
    Undefined Behavior Due to Out-of-Bounds Pointer Arithmetic in libwebsockets
    cvelistv5