CVE-2025-47729 TeleMessage TM SGNL: hidden backdoor
In plain words: The software was shipped with hidden malicious code inside it. Whoever planted it has secret access to every copy.
Confirmed exploited by CISA on · US federal patch deadline Jun 2, 2025
What to do
- Install TeleMessage's security update for TM SGNL. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- TeleMessage TM SGNL Hidden Functionality Vulnerability
- Product
- TeleMessage TM SGNL
- CISA description
- TeleMessage TM SGNL contains a hidden functionality vulnerability in which the archiving backend holds cleartext copies of messages from TM SGNL application users.
- Type of flaw
- Hidden backdoor (CWE-912)
- Confirmed exploited
- May 12, 2025
- US federal patch deadline
- Jun 2, 2025
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Answering about CVE-2025-47729 ·
Questions about CVE-2025-47729
Is CVE-2025-47729 being exploited?
Yes. CISA added CVE-2025-47729 to its Known Exploited Vulnerabilities catalog on May 12, 2025, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2025-47729?
Install TeleMessage's security update for TM SGNL. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2025-47729?
Only if you use TeleMessage TM SGNL. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.