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.
This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.
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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3.1 Vector
No CVSS vector data available.
Exploit Intelligence
0.70%probability of exploitation in 30 days
50thpercentile
Moderate risk: more likely to be exploited than 50% of all known CVEs.
Published advisories record a fix for 11 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2025-9648 being actively exploited?
Not that we know of. CVE-2025-9648 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.70% is the estimated probability that it will be exploited in the next 30 days. That is higher than 50% of all scored CVEs.
What does CVE-2025-9648 affect?
Published advisories record a fix for civetweb (Debian), registry.redhat.io/advanced-cluster-security/rhacs (Rocky), registry.redhat.io/advanced-cluster-security/rhacs (Red Hat / RHEL), registry.redhat.io/advanced-cluster-security/rhacs-central (Rocky), and 7 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.
This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-09-29.