Description

FastNetMon Community Edition through 1.2.9 does not verify TLS certificates on outbound HTTPS connections. The execute_web_request_secure() function in src/fast_library.cpp creates a boost::asio::ssl::context with tls_client mode and calls set_default_verify_paths() to load CA certificates, but never calls set_verify_mode(boost::asio::ssl::verify_peer). Without this call, OpenSSL performs the TLS handshake without validating the server's certificate chain, making all HTTPS connections vulnerable to man-in-the-middle attacks. This function is used for telemetry reporting to community-stats.fastnetmon.com, which sends system information including CPU model, kernel version, traffic statistics, and software configuration. An attacker can intercept and modify this data or redirect it to a malicious server.

Weaknesses 1

Affected Products 1

References 3

• github.com https://github.com/pavel-odintsov/fastnetmon
  Product
• github.com https://github.com/pavel-odintsov/fastnetmon/blob/master/src/fast_library.cpp
  Product
• lorikeetsecurity.com https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48697-missing-tls-validation
  Third Party Advisory

Remediation