CVE-2021-20998
WAGO: Managed Switches: Unauthorized creation of user accounts
In multiple managed switches by WAGO in different versions without authorization and with specially crafted packets it is possible to create users.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
WAGO: Managed Switches: Unauthorized creation of user accounts
In multiple managed switches by WAGO in different versions without authorization and with specially crafted packets it is possible to create users.
- Record
CVE-2021-20998- CVSS 3.1
- 10.0 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-306
- Updated
- 2026-11-02
EUVDEUVD-2021-8407
In multiple managed switches by WAGO in different versions without authorization and with specially crafted packets it is possible to create users.
- Record
EUVD-2021-8407- CVSS 3.1
- 10.0 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-wvfh-fc5m-v972 No score
In multiple managed switches by WAGO in different versions without authorization and with...
In multiple managed switches by WAGO in different versions without authorization and with specially crafted packets it is possible to create users.
- Record
GHSA-wvfh-fc5m-v972- Weakness
- CWE-306
- Updated
- 2026-11-02
NVD
In multiple managed switches by WAGO in different versions without authorization and with specially crafted packets it is possible to create users.
- Record
CVE-2021-20998- CVSS 3.1
- 10.0 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-306
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-20998 is a critical vulnerability (CVSS 10.0) in Wago 0852-0303, published May 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.11%, the 66th percentile. No source names a fixed version.