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CVE-2025-55763 — Heap overflow PoC for CivetWeb CVE-2025-55763 | Kitploit
Tools/GitHubGitHub/krispybyte/cve-2025-55763
Vulnerability AnalysisExploitationWeb SecurityFuzzingBinary Exploitation
GitHubkrispybyte/cve-2025-55763

CVE-2025-55763

Heap overflow PoC for CivetWeb CVE-2025-55763

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529 months agoNot yet reviewed

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CVE-2025-55763

Buffer Overflow in the URI parser of CivetWeb 1.16 (latest release as of yet).

Vulnerable code

The crash occurs here in src/civetweb.c during the last strcat marked.

Fix

See the pull request.

PoC

The PoC crashes the server performing an heap overflow, however it is possible to achieve remote code execution by crafting an exploit for this vulnerability.

cat http_request_crash_input.txt | nc 127.0.0.1 8080

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