HOMEVULNERABILITIESCVE-2018-14821
HIGH

CVE-2018-14821

CWE-122Published: September 20, 2018· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

Rockwell Automation RSLinx Classic Versions 4.00.01 and prior. This vulnerability may allow a remote, unauthenticated threat actor to intentionally send a malformed CIP packet to Port 44818, causing the RSLinx Classic application to terminate. The user will need to manually restart the software to regain functionality.

NVD Source

Technical Analysis

CVE-2018-14821 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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

rockwellautomation1 product(s)
rslinx
Source: NVD CPE · 1 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://ics-cert.us-cert.gov/advisories/ICSA-18-263-02
ADVISORYhttps://www.tenable.com/security/research/tra-2018-26
ADVISORYhttps://ics-cert.us-cert.gov/advisories/ICSA-18-263-02
ADVISORYhttps://www.tenable.com/security/research/tra-2018-26

All References (4)

→
https://ics-cert.us-cert.gov/advisories/ICSA-18-263-02Third Party Advisory · US Government Resource
→
https://www.tenable.com/security/research/tra-2018-26Exploit · Third Party Advisory
→
https://ics-cert.us-cert.gov/advisories/ICSA-18-263-02Third Party Advisory · US Government Resource
→
https://www.tenable.com/security/research/tra-2018-26Exploit · Third Party Advisory

Quick Facts

CVE IDCVE-2018-14821
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-122
CISA KEVNo
Affected1 vendor(s)
PublishedSep 20, 2018

Related CVEs (CWE-122)

CVE-2025-23123
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CVE-2021-25387
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CVE-2022-34819
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CVE-2021-21940
10.0
CVE-2026-46752
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CVE-2026-44050
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-14821 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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