CVE-2025-9648
published 2025-09-29CVE-2025-9648: 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…
PriorityP354high8.7CVSS 4.0
AVNACLATNPRNUINVCNVINVAHSCNSINSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.71%
49.4th percentile
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.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| civetweb | civetweb | 1.10 – 1.16 | — |
| civetweb_project | civetweb | >= 0 < 1.16+dfsg-2+deb13u1 | 1.16+dfsg-2+deb13u1 |
| civetweb_project | civetweb | >= 0 < 1.16+dfsg-4 | 1.16+dfsg-4 |
| debian | civetweb | < civetweb 1.16+dfsg-4 (forky) | civetweb 1.16+dfsg-4 (forky) |
| msrc | azl3_ceph_18.2.2-10_on_azure_linux_3.0 | — | — |
| msrc | cbl2_ceph_16.2.10-9_on_cbl_mariner_2.0 | — | — |
CVSS provenance
nvdv4.08.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
osv8.7HIGH
vendor_debian8.7HIGH
vendor_msrc8.7HIGH
vendor_redhat8.7HIGH
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Red Hat
civetweb: Denial of Service in CivetWeb
vendor_redhat·2025-09-29·CVSS 8.7
CVE-2025-9648 [HIGH] CWE-158 civetweb: Denial of Service in CivetWeb
civetweb: Denial of Service in CivetWeb
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.
A denial of service flaw has been discovered in CivetWeb. The mg_handle_form_request function allows attackers to trigger a denial of service (DoS) condition by sending a specially crafted HTTP POST requ
Microsoft
Denial of Service in CivetWeb
vendor_msrc·2025-09-09·CVSS 8.7
CVE-2025-9648 [HIGH] CWE-158 Denial of Service in CivetWeb
Denial of Service in CivetWeb
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
CERT-PL: CERT-PL
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: https://learn.microsoft.com/en-us/a
Debian
CVE-2025-9648: civetweb - A vulnerability in the CivetWeb library's function mg_handle_form_request allows...
vendor_debian·2025·CVSS 8.7
CVE-2025-9648 [HIGH] CVE-2025-9648: civetweb - A vulnerability in the CivetWeb library's function mg_handle_form_request allows...
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.
Scope: local
bookworm: open
bullseye: open
forky: resolved (fixed in 1.16+dfsg-4)
sid: resolved (fixed in 1.16+dfsg-4)
trixie: resolved (fixed in 1.16+dfsg-2+deb13u1)
GHSA
GHSA-2gxg-pvm2-2p6x: A vulnerability in the CivetWeb library's function mg_handle_form_request allows remote attackers to trigger a denial of service (DoS) condition
ghsa_unreviewed·2025-09-29
CVE-2025-9648 [HIGH] CWE-158 GHSA-2gxg-pvm2-2p6x: A vulnerability in the CivetWeb library's function mg_handle_form_request allows remote attackers to trigger a denial of service (DoS) condition
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.
OSV
CVE-2025-9648: A vulnerability in the CivetWeb library's function mg_handle_form_request allows remote attackers to trigger a denial of service (DoS) condition
osv·2025-09-29·CVSS 8.7
CVE-2025-9648 [HIGH] CVE-2025-9648: A vulnerability in the CivetWeb library's function mg_handle_form_request allows remote attackers to trigger a denial of service (DoS) condition
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.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2025-09-29
Published