High severity · published Aug 29, 2025
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
7.5
CVSS
1.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 68% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CI
Civetweb · Civetweb Project
1.14 through 1.16 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-55763
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-55763
Product
https://github.com/civetweb/civetweb
Exploit
https://github.com/krispybyte/CVE-2025-55763
More from Civetweb
9.8
CVE-2020-27304
The CivetWeb web library does not validate uploaded filepaths when running on an OS other than Windows, when using the built-in HTTP form-based file upload mechanism, via the…
7.8
CVE-2026-5789
Search path without quotes in CivetWeb
7.1
CVE-2018-12684
Out-of-bounds Read in the send_ssi_file function in civetweb.c in CivetWeb through 1.10 allows attackers to cause a Denial of Service or Information Disclosure via a crafted SSI…