CVE-2021-22743 json
Improper Check for Unusual or Exceptional Conditions vulnerability exists in Triconex TCM 4351B installed on Tricon V11.3.x systems that co…
published 2021-05-26 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-9878
- cvss
- 3.9
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 13%
- public exploits
- 0
- none known
Summary
Improper Check for Unusual or Exceptional Conditions vulnerability exists in Triconex TCM 4351B installed on Tricon V11.3.x systems that could cause module reset when TCM receives malformed TriStation packets while the write-protect keyswitch is in the program position.
Patch / fix
- schneider-electric triconex_model_3009_mp_firmware 11.8.0
- schneider-electric tcm_4351b_firmware 11.5.1
Exploit prediction
0.22% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 3.9 | CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 2.1 | AV:L/AC:L/Au:N/C:N/I:N/A:P |
Affected products
- n/a Triconex TCM 4351B installed on Tricon V11.3.x systems.
Classification
- Weakness
-
- CWE-754 Improper Check for Unusual or Exceptional Conditions
References
Sources
- CVE List CVE-2021-22743
- NVD CVE-2021-22743
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.