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CVE-2025-55763 is a heap-based buffer overflow in CivetWeb's URI parsing during HTTP request processing. CivetWeb versions 1.14 through 1.16 incorrectly handle certain crafted URIs, permitting a remote attacker to corrupt heap memory. The flaw affects CivetWeb and libcivetweb packages, including affected Ubuntu 22.04 LTS and 24.04 LTS deployments.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a proof-of-concept (PoC) exploit for CVE-2025-55763, a buffer overflow vulnerability in the URI parser of CivetWeb versions 1.14 through 1.16. The repository consists of a README.md file describing the vulnerability, affected versions, and usage instructions, and a http_request_crash_input.txt file containing a specially crafted HTTP request. The exploit works by sending this request to a CivetWeb server (typically on 127.0.0.1:8080), causing a heap overflow and crashing the server. While the provided PoC demonstrates a denial of service, the vulnerability may be further exploited for remote code execution. No exploit framework is used; the exploit is a simple, standalone PoC using raw network input.
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