CVE-2025-55763: civetweb_project civetweb Stack-based Buffer Overflow
Vulnerability summary
CVE-2025-55763 is a high (CVSS 7.5) Stack-based Buffer Overflow vulnerability in civetweb_project civetweb. EPSS estimates a 1.19% chance of exploitation in the next 30 days, higher than 67.4% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 29-08-2025PublishedVulnerability first disclosed.
- 29-08-2025Last modifiedVulnerability information updated.
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 metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
1.19%
Chance of exploitation in the next 30 days
Percentile
67%
Versus all other CVEs
30-day change
0.00 pp
From 1.19% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundCve 2025 55763
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Civetweb_project1 product
- civetweb≥ 1.14, ≤ 1.16
Debian1 product
- civetwebAll versions (No fix recorded) | < 1.16+dfsg-2+deb13u1 | < 1.16+dfsg-3
Opensuse1 product
- civetweb&distro=openSUSE Tumbleweed< 1.6+git1776611085.588860e3-1.1
Ubuntu1 product
- civetweb< 1.15+dfsg-3ubuntu0.1~esm1 | < 1.16+dfsg-1ubuntu0.1 | All versions (No fix recorded) | < 1.16+dfsg-3
4 vendors · 4 products
