CVE-2021-22659
8.6 HIGHRockwell Automation MicroLogix 1400 Version 21.6 and below may allow a remote unauthenticated attacker to send a specially crafted Modbus...
Published: 2021-03-25 · Last updated: 2026-06-03
Severity and scoring
- CVSS
- 8.6 HIGH
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
- CWE
- CWE-120
Affected products
| Vendor | Product |
|---|---|
| rockwellautomation | micrologix_1400_firmware |
Description
Rockwell Automation MicroLogix 1400 Version 21.6 and below may allow a remote unauthenticated attacker to send a specially crafted Modbus packet allowing the attacker to retrieve or modify random values in the register. If successfully exploited, this may lead to a buffer overflow resulting in a denial-of-service condition. The FAULT LED will flash RED and communications may be lost. Recovery from denial-of-service condition requires the fault to be cleared by the user.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2021-22659
- [Vendor advisory]https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129877/loc/en_US#__highlight
- [Other]https://us-cert.cisa.gov/ics/advisories/icsa-21-033-01
- [Vendor advisory]https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129877/loc/en_US#__highlight
- [Other]https://us-cert.cisa.gov/ics/advisories/icsa-21-033-01
Related CVEs
Same vendor
- CVE-2021-33012 — Rockwell Automation MicroLogix 1100, all versions, allows a remote, unauthenticated attacker sending specially crafted commands to cause ... (8.6 HIGH)
- CVE-2021-32926 — When an authenticated password change request takes place, this vulnerability could allow the attacker to intercept the message that incl... (7.5 HIGH)
- CVE-2020-6990 — Rockwell Automation MicroLogix 1400 Controllers Series B v21.001 and prior, Series A, all versions, MicroLogix 1100 Controller, all versi... (9.8 CRITICAL)
- CVE-2020-6988 — Rockwell Automation MicroLogix 1400 Controllers Series B v21.001 and prior, Series A, all versions, MicroLogix 1100 Controller, all versi... (7.5 HIGH)
- CVE-2020-6984 — Rockwell Automation MicroLogix 1400 Controllers Series B v21.001 and prior, Series A, all versions, MicroLogix 1100 Controller, all versi... (7.5 HIGH)
Same CWE
- CVE-2026-36818 — Shenzhen Tenda Technology Co., Ltd Tenda W20E v15.11.0.6 was discovered to contain a buffer overflow in the wewifiWhiteUserInfo parameter... (7.5 HIGH)
- CVE-2026-36817 — Shenzhen Tenda Technology Co., Ltd Tenda W15E v15.11.0.10 was discovered to contain a buffer overflow in the webAuthWhiteUserInfo paramet... (7.5 HIGH)
- CVE-2026-36816 — Shenzhen Tenda Technology Co., Ltd Tenda W15E v15.11.0.10 was discovered to contain a buffer overflow in the wewifiWhiteUserInfo paramete... (7.5 HIGH)
- CVE-2026-36815 — Shenzhen Tenda Technology Co., Ltd Tenda W15E v15.11.0.10 was discovered to contain a buffer overflow in the hostname parameter of the fo... (7.5 HIGH)
- CVE-2026-36811 — Shenzhen Tenda Technology Co., Ltd Tenda W15E v15.11.0.10 was discovered to contain a buffer overflow in the picName parameter of the for... (7.5 HIGH)