#VU52302 Reachable Assertion in OpENer - CVE-2021-27500

Vulnerability identifier: #VU52302

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-27500

CWE-ID: CWE-617

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpENer
Server applications / Other server solutions

Vendor: EIP Stack Group

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a reachable assertion in OpENer EtherNet/IP. A remote attacker can send a specially crafted packet and cause a denial of service condition on the target system.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

OpENer: 1.2.0 - 2.3

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External links
https://ics-cert.us-cert.gov/advisories/icsa-21-105-02

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.