CVE-2021-31889
Last modified
CVE-2021-31889 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), PLUSCONTROL 1st Gen (All versions), SIMOTICS CONNECT 400 (All versions < V0.5.0.0). Malformed TCP packets with a corrupted SACK option leads to Information Leaks and Denial-of-Service conditions. EPSS estimates a 2.42% chance of exploitation in the next 30 days.
Description
A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), PLUSCONTROL 1st Gen (All versions), SIMOTICS CONNECT 400 (All versions < V0.5.0.0). Malformed TCP packets with a corrupted SACK option leads to Information Leaks and Denial-of-Service conditions. (FSMD-2021-0015)
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Siemens | Capital Vstar | All versions |
| Siemens | Nucleus Net | All versions |
| Siemens | Nucleus Readystart V3 | < 2017.02.3 |
| Siemens | Nucleus Source Code | All versions |
| Siemens | Apogee Modular Building Controller Firmware | All versions |
| Siemens | Apogee Modular Equiment Controller Firmware | All versions |
| Siemens | Apogee Pxc Compact Firmware | All versions |
| Siemens | Apogee Pxc Modular Firmware | All versions |
| Siemens | Talon Tc Compact Firmware | All versions |
| Siemens | Talon Tc Modular Firmware | All versions |
References
Timeline
- Published
- Last Modified
- Status
- Modified
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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