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CVE-2025-9648

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Date: September 29, 2025

A vulnerability in the CivetWeb library's function mg_handle_form_request allows remote attackers to trigger a denial of service (DoS) condition. By sending a specially crafted HTTP POST request containing a null byte in the payload, the server enters an infinite loop during form data parsing. Multiple malicious requests will result in complete CPU exhaustion and render the service unresponsive to further requests. This issue was fixed in commit 782e189. This issue affects only the library, standalone executable pre-built by vendor is not affected.

Severity Score

Related Resources (6)

https://nvd.nist.gov/vuln/detail/CVE-2025-9648
https://github.com/civetweb/civetweb
https://github.com/civetweb/civetweb/issues/1348
https://cert.pl/en/posts/2025/09/CVE-2025-9648
https://github.com/civetweb/civetweb/commit/782e18903515f43bafbf2e668994e82bdfa51133
https://www.mend.io/vulnerability-database/CVE-2025-9648

Severity Score

Weakness Type (CWE)

Improper Neutralization of Null Byte or NUL Character

CWE-158

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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