8.7

CVE-2025-9648: civetweb

CVSS: 8.7v4.0HighDeferred
AliasesUBUNTU-CVE-2025-9648DEBIAN-CVE-2025-9648
Published 29-09-2025Last modified 29-09-2025
Open JSON

Vulnerability summary

CVE-2025-9648 is a high (CVSS 8.7) vulnerability in civetweb. EPSS estimates a 0.76% chance of exploitation in the next 30 days, higher than 54.2% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.76%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
USN-8749-1

Timeline

  1. 29-09-2025
    PublishedVulnerability first disclosed.
  2. 29-09-2025
    Last modifiedVulnerability information updated.

Description

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 metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.76%

Chance of exploitation in the next 30 days

Percentile

54%

Versus all other CVEs

30-day change

0.00 pp

From 0.76% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.76%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Civetweb1 product
Debian1 product
  • civetwebAll versions (No fix recorded) | < 1.16+dfsg-2+deb13u1 | < 1.16+dfsg-4
Ubuntu1 product
  • civetweb< 1.15+dfsg-3ubuntu0.1~esm1 | < 1.16+dfsg-1ubuntu0.1 | All versions (No fix recorded) | < 1.16+dfsg-3ubuntu0.1

3 vendors · 3 products

References

9 links