CVE-2018-14821
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.50%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 4.50% probability · 91th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-122, CWE-119
- Affected
- rockwellautomation/rslinx
- Source
- ics-cert@hq.dhs.gov
EPSS 4.5% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.