Cyber Resilience

CVE-2021-34581

High

Published: 31 August 2021

Published
31 August 2021
Modified
21 November 2024
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 0.0172 82.8th percentile
Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-34581 is a high-severity Missing Release of Resource after Effective Lifetime (CWE-772) vulnerability in Wago 750-880\/040-000 Firmware. Its CVSS base score is 7.5 (High).

Operationally, ranked in the top 17.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Missing Release of Resource after Effective Lifetime vulnerability in OpenSSL implementation of WAGO 750-831/xxx-xxx, 750-880/xxx-xxx, 750-881, 750-889 in versions FW4 up to FW15 allows an unauthenticated attacker to cause DoS on the device.

CWE(s)
CWE-772

Related Threats

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

Affected Assets

wago
750-880\/040-000 firmware
fw4 — fw15
wago
750-880\/025-002 firmware
fw4 — fw15
wago
750-880\/025-001 firmware
fw4 — fw15
wago
750-880\/025-000 firmware
fw4 — fw15
wago
750-831\/000-002 firmware
fw4 — fw15
wago
750-889 firmware
fw4 — fw15
wago
750-881 firmware
fw4 — fw15
wago
750-831 firmware
fw4 — fw15
wago
750-880 firmware
fw4 — fw15

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.

SC-10 Network Disconnect
addresses: CWE-772

Ensures network resources are released once the session ends or becomes inactive, closing the window for missing-release weaknesses.

References