Cyber Resilience

CVE-2021-34586

HighPublic PoC

Published: 26 October 2021

Published
26 October 2021
Modified
15 August 2025
KEV Added
—
Patch
—
CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0046 64.6th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-34586 is a high-severity NULL Pointer Dereference (CWE-476) vulnerability in Wago 750-823 Firmware. Its CVSS base score is 7.5 (High).

Operationally, ranked in the top 35.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

In the CODESYS V2 web server prior to V1.1.9.22 crafted web server requests may cause a Null pointer dereference in the CODESYS web server and may result in a denial-of-service condition.

CWE(s)
CWE-476

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

wago
750-823 firmware
≤ fw10
wago
750-829 firmware
≤ fw17
wago
750-831 firmware
≤ fw17
wago
750-832 firmware
≤ fw10
wago
750-852 firmware
≤ fw17
wago
750-862 firmware
≤ fw10
wago
750-880 firmware
≤ fw17
wago
750-881 firmware
≤ fw17
wago
750-882 firmware
≤ fw17
wago
750-885 firmware
≤ fw17
+18 more product configuration(s) — see NVD for full list

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References