CVE-2020-6998
No exploitation reported by the sources we read.
- Published2022-07-27
- WeaknessCWE-20
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
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.
Timeline
dates in UTC- 2022-07-2721:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-6998?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-6998?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 33.x | ≤ 33 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 33.x | ≤ 33 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 33.x | ≤ 33 | no fix published | NVD |
6 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Rockwell Automation CompactLogix 5370 and ControlLogix 5570 Controllers (Update A)
ControlLogix 5570 controllers :Versions 33 and prior · Compact GuardLogix 5370 controllers: Versions 33 and prior · CompactLogix 5370 L2 controllers: Versions 33 and prior · +4 more
Fix
- Mitigation from the vendor CISA ICSA-21-061-02 · 7 productsRockwell Automation recommends affected users apply firmware v33.011 or later.
- Mitigation from the vendor CISA ICSA-21-061-02 · 7 productsFor more information see the Rockwell Automation advisory (login required).
Advisories and patches
- rockwellautomation.custhelp.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Published
- 2022-07-27
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2020-6998?
Is CVE-2020-6998 actively exploited?
What is the CVSS score for CVE-2020-6998?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.