HOMEVULNERABILITIESCVE-2020-6111
HIGH

CVE-2020-6111

CWE-189Published: December 3, 2020· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

An exploitable denial-of-service vulnerability exists in the IPv4 functionality of Allen-Bradley MicroLogix 1100 Programmable Logic Controller Systems Series B FRN 16.000, Series B FRN 15.002, Series B FRN 15.000, Series B FRN 14.000, Series B FRN 13.000, Series B FRN 12.000, Series B FRN 11.000 and Series B FRN 10.000. A specially crafted packet can cause a major error, resulting in a denial of service. An attacker can send a malicious packet to trigger this vulnerability.

NVD Source

Technical Analysis

CVE-2020-6111 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

rockwellautomation2 product(s)
micrologix 1100 b firmwaremicrologix 1100
Source: NVD CPE · 9 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://talosintelligence.com/vulnerability_reports/TALOS-2020-1057
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-21-047-02
ADVISORYhttps://talosintelligence.com/vulnerability_reports/TALOS-2020-1057
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-21-047-02

All References (4)

→
https://talosintelligence.com/vulnerability_reports/TALOS-2020-1057Third Party Advisory
→
https://us-cert.cisa.gov/ics/advisories/icsa-21-047-02Third Party Advisory · US Government Resource
→
https://talosintelligence.com/vulnerability_reports/TALOS-2020-1057Third Party Advisory
→
https://us-cert.cisa.gov/ics/advisories/icsa-21-047-02Third Party Advisory · US Government Resource

Quick Facts

CVE IDCVE-2020-6111
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-189
CISA KEVNo
Affected1 vendor(s)
PublishedDec 3, 2020

Related CVEs (CWE-189)

CVE-2008-2303
10.0
CVE-2008-7126
10.0
CVE-2015-5560
10.0
CVE-2008-5159
10.0
CVE-2008-6393
10.0
CVE-2011-1564
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-6111 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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