CVE-2021-21777

10.0 criticalEPSS 1.7%

Critical (10.0) in opener project opener. EPSS 1.7% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

10.0 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:H

EPSS: 1.7% chance of exploitation in the next 30 days; higher than 76% of CVEs (scores of 2026-10-31)
CWE: CWE-125
Published: 2021-06-17
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

opener_project:opener

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1234
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1234

Check your stack JSON