CVE-2020-13556

PoC —

CVSS 3.1

9.8 critical

EPSS

5%p91

Published

Dec 11, 2020 (Dec 11, 2020)

Modified

Jun 17, 2026

Description

An out-of-bounds write vulnerability exists in the Ethernet/IP server functionality of EIP Stack Group OpENer 2.3 and development commit 8c73bf3. A specially crafted series of network requests can lead to remote code execution. An attacker can send a sequence of requests to trigger this vulnerability.

Vendors: opener project
Products: opener
Weakness: CWE-787
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (4.7%)

In the news2 stories

Severe Bugs Reported in EtherNet/IP Stack for Industrial Systems

The Hacker NewsApr 15, 00:00 UTC · Apr 15, 2021Vulnerability CVE-2020-13556 CVE-2021-27478 CVE-2021-27482+2 CVEs

Vulnerability Spotlight: DoS, code execution vulnerabilities in EIP Stack Group OpENer

Cisco TalosDec 2, 21:21 UTC · Dec 2, 2020Vulnerability in the wildCVE-2020-13530 CVE-2020-13556