CVE-2021-34567 json
WAGO I/O-Check Service prone to Out-of-bounds Read
published 2022-11-09 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-21217
- cvss
- 8.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 63%
- public exploits
- 0
- none known
Summary
In WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet containing OS commands to provoke a denial of service and an limited out-of-bounds read.
Patch / fix
- wago 750-8100_firmware 18
- wago 750-8101_firmware 18
- wago 750-8101/025-000_firmware 18
- wago 750-8102_firmware 18
- wago 750-8102/025-000_firmware 18
- wago 750-8202_firmware 18
- wago 750-8202/000-011_firmware 18
- wago 750-8202/000-012_firmware 18
- wago 750-8202/000-022_firmware 18
- wago 750-8202/025-000_firmware 18
- wago 750-8202/025-001_firmware 18
- wago 750-8202/025-002_firmware 18
- wago 750-8202/040-000_firmware 18
- wago 750-8202/040-001_firmware 18
- wago 752-8303/8000-002_firmware 18
- wago 762-4101_firmware 18
- wago 762-4102_firmware 18
- wago 762-4103_firmware 18
- wago 762-4104_firmware 18
- wago 762-4201/8000-001_firmware 18
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 18 mo ago
Exploit prediction
1.03% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H |
Affected products
- WAGO 750-81xx/xxx-xxxFW
- WAGO 750-82xx/xxx-xxx
- WAGO 752-8303/8000-0002
- WAGO 762-4xxx
- WAGO 762-5xxx
- WAGO 762-6xxx
Classification
- Weakness
-
- CWE-125 Out-of-bounds Read
References
-
cert.vde.com
/en/advisories/VDE-2020-036/
vendor-advisory
Sources
- CVE List CVE-2021-34567
- NVD CVE-2021-34567
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.