SB2025102809 - Spoofing attack via X-Forwarded-For/X-Real-IP headers in Cpp-httplib

Description

This security bulletin contains information about 2 vulnerabilities.

1) Insufficient verification of data authenticity (CVE-ID: CVE-2025-66570)

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to software trusts data passed via the X-Forwarded-For/X-Real-IP headers and uses this date when writing log entries or appending headers to the request. A remote attacker can modify these headers and poison log files or inject arbitrary HTTP headers into HTTP requests. 

2) Insufficient verification of data authenticity (CVE-ID: CVE-2025-66577)

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to software trusts data passed via the X-Forwarded-For/X-Real-IP headers.  A remote attacker can modify these headers and poison log files or inject arbitrary HTTP headers into HTTP requests. 

Remediation

Install update from vendor's website.

References

• https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-xm2j-vfr9-mg9m
• https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-gfpf-r66f-5mh2