CVE-2025-66577

MEDIUM EPSS 14.4%
Published Dec 5, 20256mo ago · Modified Jun 17, 20262w ago
5.3 CVSS 3.1
Medium
Find Similar
Published Dec 5, 2025 6mo ago
Last Modified Jun 17, 2026 2w ago

Description

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.27.0, a vulnerability allows attacker-controlled HTTP headers to influence server-visible metadata, logging, and authorization decisions. An attacker can supply X-Forwarded-For or X-Real-IP headers which get accepted unconditionally by get_client_ip() in docker/main.cc, causing access and error logs (nginx_access_logger / nginx_error_logger) to record spoofed client IPs (log poisoning / audit evasion). This vulnerability is fixed in 0.27.0.

CVSS Details

Base Score
5.3
Exploitability
3.9
Impact
1.4
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
14.4% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-117
CWE-807

Affected Products 1

VendorProductVersionRange
yhirosecpp-httplib* <0.27.0

References 2

  • github.com https://github.com/yhirose/cpp-httplib/commit/ac9ebb0ee333ce8bf13523f487bdfad9518a2aff
    Patch
  • github.com https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-gfpf-r66f-5mh2
    ExploitThird Party Advisory

Remediation

  • github.com https://github.com/yhirose/cpp-httplib/commit/ac9ebb0ee333ce8bf13523f487bdfad9518a2aff
    Patch