CVE-2021-20998 json
WAGO: Managed Switches: Unauthorized creation of user accounts
published 2021-05-13 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8407
- cvss
- 10.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 66%
- public exploits
- 0
- none known
Summary
In multiple managed switches by WAGO in different versions without authorization and with specially crafted packets it is possible to create users.
Exploit prediction
1.11% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- WAGO 0852-0303
- WAGO 0852-1305
- WAGO 0852-1505
- WAGO 0852-1305/000-001
- WAGO 0852-1505/000-001
Classification
- Weakness
-
- CWE-306 Missing Authentication for Critical Functionality
References
-
cert.vde.com
/en-us/advisories/vde-2021-013
third-party-advisory
Sources
- CVE List CVE-2021-20998
- NVD CVE-2021-20998
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.