High 8.7Published Sep 29, 2025

CVE-2025-9648Denial of Service in CivetWeb

Updated under an hour ago (Oct 26, 2026, 5:10 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for CivetWeb

Exploited in the last 30 days

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.

CVSS: 8.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-158
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: CERT-PL
NVD analysis: Deferred
Record last updated: Sep 29, 2025
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

CivetWeb CivetWeb civetweb:civetweb (from the name)	before 1.08 not affected; from 1.08 before 1.10 status unknown; from 1.10 through 1.16	CNA record

References

https://cert.pl/en/posts/2025/09/CVE-2025-9648third-party-advisory
https://github.com/civetweb/civetwebproduct
https://github.com/civetweb/civetweb/issues/1348issue-tracking
https://github.com/civetweb/civetweb/commit/782e18903515f43bafbf2e668994e82bdfa51133patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.