CVE-2025-55763
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-08-29

Last updated on: 2025-09-09

Assigner: MITRE

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.
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Meta Information
Published
2025-08-29
Last Modified
2025-09-09
Generated
2026-06-16
AI Q&A
2025-08-29
EPSS Evaluated
2026-06-15
NVD
CVE-2025-55763
EUVD
EUVD-2025-26228
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
civetweb_project civetweb From 1.14 (inc) to 1.16 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
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Executive Summary

This vulnerability is a buffer overflow in the URI parser of CivetWeb versions 1.14 through 1.16. It occurs when the server processes a specially crafted HTTP request, causing a heap overflow that can crash the server or be exploited to execute arbitrary code remotely. [1]

Impact Analysis

An attacker can exploit this vulnerability to crash the CivetWeb server, causing a denial of service, or potentially execute arbitrary code remotely, which could lead to full system compromise. [1]

Detection Guidance

This vulnerability can be detected by sending a specially crafted HTTP request to the CivetWeb server and observing if it crashes due to a heap overflow. A proof-of-concept (PoC) is available that demonstrates this by using a crafted input file. You can test it by running the command: `cat http_request_crash_input.txt | nc 127.0.0.1 8080`, which pipes the crafted HTTP request to the server and may trigger the vulnerability if present. [1]

Mitigation Strategies

Immediate mitigation steps include applying the fix referenced in the pull request mentioned in the PoC repository. Until the fix is applied, you should consider restricting access to the CivetWeb server to trusted networks only, monitoring for crashes or unusual behavior, and avoiding exposure of the vulnerable versions (1.14 through 1.16) to untrusted networks. [1]

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