FastNetMon Community Edition up to 1.2.9 src/fast_library.cpp execute_web_request_secure improper following of a certificate's chain of trust

Summaryinfo

A vulnerability, which was classified as problematic, was found in FastNetMon Community Edition up to 1.2.9. Affected by this issue is the function execute_web_request_secure in the library src/fast_library.cpp. Such manipulation leads to improper following of a certificate's chain of trust. This vulnerability is documented as CVE-2026-48697. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in FastNetMon Community Edition up to 1.2.9. It has been rated as problematic. Affected by this issue is the function execute_web_request_secure in the library src/fast_library.cpp. The manipulation with an unknown input leads to a improper following of a certificate's chain of trust vulnerability. Using CWE to declare the problem leads to CWE-296. The product does not follow, or incorrectly follows, the chain of trust for a certificate back to a trusted root certificate, resulting in incorrect trust of any resource that is associated with that certificate. Impacted is integrity. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-48697 since 05/22/2026. The exploitation is known to be difficult. The attack may be launched remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 05/26/2026). The MITRE ATT&CK project declares the attack technique as T1557.003.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-31900). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• FastNetMon

Name

• Community Edition

Version

• 1.2.0
• 1.2.1
• 1.2.2
• 1.2.3
• 1.2.4
• 1.2.5
• 1.2.6
• 1.2.7
• 1.2.8
• 1.2.9

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion