Buffer overflow in Civetweb Project
CVE-2025-55763
Buffer Overflow in the URI parser of CivetWeb 1.14 through 1.16 (latest) allows a remote attacker to achieve remote code execution via a crafted HTTP request. This vulnerability is triggered during request processing and may allow an attacker to corrupt heap memory, potentially leading to denial of service or arbitrary code execution.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.012 (67.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 67.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/civetweb/civetweb (Product)
- github.com/krispybyte/CVE-2025-55763 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-55763?
- CVE-2025-55763 is a high-severity vulnerability in Civetweb Project, classified under Stack-based Buffer Overflow. CVSS score: 7.5/10. Published 2025-08-29.
- How severe is CVE-2025-55763?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-55763 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.