Cyber Resilience

CVE-2021-21777

CriticalPublic PoC

Published: 17 June 2021

Published
17 June 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:H
EPSS Score 0.0034 57.2th percentile
Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-21777 is a critical-severity Out-of-bounds Read (CWE-125) vulnerability in Opener Project Opener. Its CVSS base score is 10.0 (Critical).

Operationally, ranked in the top 42.8% 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

An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer 2.3 and development commit 8c73bf3. A specially crafted network request can lead to an out-of-bounds read.

CWE(s)
CWE-125

Related Threats

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

Affected Assets

opener project
opener
2.3

Mitigating Controls

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

References