PT-2025-49306 · Unknown+1 · Cpp-Httplib+1

CVE-2025-66577 · Published 2025-01-01 · Updated 2026-01-21

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions cpp-httplib versions prior to 0.27.0

Description The software is a C++11 single-file header-only cross-platform HTTP/HTTPS library. A flaw exists where attacker-controlled HTTP headers can affect server-visible metadata, logging, and authorization decisions. Specifically, the get client ip() function in docker/main.cc unconditionally accepts X-Forwarded-For or X-Real-IP headers. This allows an attacker to spoof client IPs in access and error logs (log poisoning / audit evasion). The vulnerable function is get client ip().

Recommendations Update to version 0.27.0 or later.

Exploit

Fix

Weakness Enumeration

CWE-807

CWE-117

Related Identifiers

CVE-2025-66577

ECHO-EE91-3948-5C74

GHSA-GFPF-R66F-5MH2

OPENSUSE-SU-2025:15844-1

OPENSUSE-SU-2026:20056-1

SUSE-SU-2026:20090-1

Affected Products

Debian

Cpp-Httplib

References · 22

• 🔥 https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-gfpf-r66f-5mh2 · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66577.json · Exploit
• https://github.com/yhirose/cpp-httplib/commit/ac9ebb0ee333ce8bf13523f487bdfad9518a2aff · Patch
• https://osv.dev/vulnerability/openSUSE-SU-2025:15844-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-66577 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-66577 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-66577 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-66577 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-66577 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-66577 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:20056-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:20090-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-66577 · Vendor Advisory
• https://twitter.com/CVEnew/status/1997016160785584165 · Twitter Post
• https://suse.com/support/update/announcement/2026/suse-su-202620090-1 · Note