CVE-2021-30189
Critical
Published: 25 May 2021
Published
25 May 2021
Modified
15 August 2025
KEV Added
—
Patch
—
CVSS Score v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score
0.0057
69.1th percentile
Risk Priority
20
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2021-30189 is a critical-severity Out-of-bounds Write (CWE-787) vulnerability in Wago 750-893 Firmware. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 30.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-17121
Vulnerability details
CODESYS V2 Web-Server before 1.1.9.20 has a Stack-based Buffer Overflow.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
wago
750-893 firmware
≤ fw08
wago
750-891 firmware
≤ fw08
wago
750-890 firmware
≤ fw08
wago
750-889 firmware
≤ fw15
wago
750-885 firmware
≤ fw15
wago
750-882 firmware
≤ fw15
wago
750-881 firmware
≤ fw15
wago
750-880 firmware
≤ fw16
wago
750-862 firmware
≤ fw08
wago
750-852 firmware
≤ fw15
+18 more product configuration(s) — see NVD for full list
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
addresses: CWE-787
Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.