CVE-2025-55763

PoC —

CVSS 3.1

7.5 high

EPSS

1%p66

Published

Aug 29, 2025 (Aug 29, 2025)

Modified

Jun 17, 2026

Description

Buffer Overflow in the URI parser of CivetWeb 1.14 through 1.16 (latest) allows a remote attacker to achieve remote code execution via a crafted HTTP request. This vulnerability is triggered during request processing and may allow an attacker to corrupt heap memory, potentially leading to denial of service or arbitrary code execution.

Vendors: civetweb project
Products: civetweb
Weakness: CWE-121
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (1.2%)

In the news1 stories

USN-8749-1: CivetWeb vulnerabilities

Ubuntu USN-8749-1 patches CivetWeb URI and HTTP request parsing flaws enabling remote DoS or possible code execution.

Ubuntu Security Notice USN-8749-1 addresses two CivetWeb vulnerabilities. CVE-2025-55763 involves incorrect URI parsing that could allow a remote attacker to cause denial of service or execute arbitrary code, affecting Ubuntu 22.04 LTS and 24.04 LTS. CVE-2025-9648 involves incorrect HTTP request parsing enabling remote denial of service.

Ubuntu Security NoticesSep 14, 01:27 UTC · 1d agoAdvisory CVE-2025-55763 CVE-2025-9648