CVE-2025-47729
CVE-2025-47729 is a security flaw in TeleMessage TM SGNL. Attackers can read information from TeleMessage TM SGNL that should be private. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 12 May 2025.[1]
TeleMessage TM SGNL is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff.
Description
CISA calls it a hidden functionality in TeleMessage TM SGNL. In its words: “TeleMessage TM SGNL contains a hidden functionality vulnerability in which the archiving backend holds cleartext copies of messages from TM SGNL application users.”[1]
The CVE record adds: “The TeleMessage archiving backend through 2025-05-05 holds cleartext copies of messages from TM SGNL (aka Archive Signal) app users, which is different functionality than described in the TeleMessage "End-to-End encryption from the mobile phone through to the corporate archive" documentation, as exploited in the wild in May 2025.”[2]
The underlying weakness is CWE-912, in MITRE’s list of common software weaknesses.
It scores 4.9 out of 10 on the Common Vulnerability Scoring System, which rates it medium, scored by NVD using CVSS 3.1.[2]
Affected versions
NVD’s record doesn’t list version ranges for it. CISA names the product as TeleMessage TM SGNL.
Most families won’t have TeleMessage TM SGNL; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 12 May 2025, 4 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 2 Jun 2025 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at under 1%. That’s in the top 62% of the flaws it scores.[3]
CISA assesses it as not automatable: each attack takes some work.
CISA doesn’t say who was attacked, or how.
Fix
CISA’s required action: “Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.”[1]
- Check whether you use it.TeleMessage TM SGNL is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
- Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 2 Jun 2025 to fix it.
- If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.
You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 4.9.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at under 1%.[3] |
See also
Other TeleMessage TM SGNL flaws
- CVE-2025-48928: exposure of core dump file to an unauthorized control sphere ·
- CVE-2025-48927: initialization of a resource with an insecure default ·
Similar flaws
- CVE-2024-20439, Cisco Smart Licensing Utility: static credential ·
- CVE-2021-25371, Samsung Mobile Devices: unspecified ·
Every TeleMessage flaw on CISA’s list · Everything added in May 2025
References
- ^ Cybersecurity and Infrastructure Security Agency. “TeleMessage TM SGNL Hidden Functionality Vulnerability”. Known Exploited Vulnerabilities Catalog, added 12 May 2025.
- ^ National Institute of Standards and Technology. “CVE-2025-47729 Detail”. National Vulnerability Database, published 8 May 2025.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.004, percentile 38.9, 31 Oct 2026.
- CVE Program. “CVE-2025-47729”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.