CVE-2020-6998

What it is

The connection establishment algorithm found in Rockwell Automation CompactLogix 5370 and ControlLogix 5570 versions 33 and prior does not sufficiently manage its control flow during execution, creating an infinite loop. This may allow an attacker to send specially crafted CIP packet requests to a controller, which may cause denial-of-service conditions in communications with other products.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

3.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2022-07-27 21:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:24 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 3.2% in the next 30 days (EPSS).
• Severity: 5.8 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2022-07-27 21:15 UTC

Last modified

2026-06-17 03:24 UTC

Exploit probability

3.2% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Rockwellautomation Armor Compact Guardlogix 5370 Firmware ≤ 33
• Rockwellautomation Compact Guardlogix 5370 Firmware ≤ 33
• Rockwellautomation Compactlogix 5370 l1 Firmware ≤ 33
• Rockwellautomation Compactlogix 5370 l2 Firmware ≤ 33
• Rockwellautomation Compactlogix 5370 l3 Firmware ≤ 33
• Rockwellautomation Controllogix 5570 Firmware ≤ 33
• Rockwellautomation Guardlogix 5560 Firmware ≤ 33
• Rockwellautomation Guardlogix 5570 Firmware ≤ 33

Attack profile CVSS 3.1 · 5.8

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

Low

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2020-6998.md and follow it. Check whether this project is affected by CVE-2020-6998. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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