CVE-2026-77847 PUBLISHED

Tycon Systems TPDIN-Monitor-WEB3 versions 2.2.9 and prior are vulnerable to a use of hard-coded credential vulnerability. This could allow an attacker to intercept sensitive information or credentials.

Tycon Systems has released TPDIN-Monitor-WEB3 Firmware v2.4.2.

Units already running v2.4.2, for subsequent updates (signed container):  https://firm.tyconsystems.com/tpdin-monitor-web3-v2/TPDIN-MONITOR-WEB3-V2_v2.4.2.tfw

All units currently in the field, including the v2.2.9 covered by this report (legacy Intel HEX):  https://firm.tyconsystems.com/tpdin-monitor-web3-v2/TPDIN-MONITOR-WEB3-V2_v2.4.2T.hex

A unit running v2.2.9 installs the .hex build directly and arrives at v2.4.2 in a single step; no intermediate version is required. The signed .tfw container cannot be read by a v2.2.9 updater, which accepts only Intel HEX, so the .hex artifact is the one every deployed unit needs.

For more information, contact Tycon Systems:  https://www.tyconsystems.com/contact

• Abdiwelli Guled reported this vulnerability to CISA. finder

• https://firm.tyconsystems.com/tpdin-monitor-web3-v2/TPDIN-MONITOR-WEB3-V2_v2.4.2.tfw
• https://firm.tyconsystems.com/tpdin-monitor-web3-v2/TPDIN-MONITOR-WEB3-V2_v2.4.2T.hex
• https://www.cisa.gov/news-events/ics-advisories/icsa-26-246-08
• https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-246-08.json

• CWE-798 CWE