What’s Vulnerable › Vulnerabilities
CVE-2021-31346
- Severity: critical (CVSS 9.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 2.0% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2021-11-09 · updated 2026-06-17
- Weakness: CWE-1284
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), SIMOTICS CONNECT 400 (All versions < V1.0.0.0). The total length of an ICMP payload (set in the IP header) is unchecked. This may lead to various side effects, including Information Leak and Denial-of-Service conditions, depending on the network buffer organization in memory. (FSMD-2021-0007)
Affected products
- 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 Capital VSTAR: all versions
- Siemens Nucleus NET: all versions
- Siemens Nucleus ReadyStart V3: before 2017.02.1 — fixed in 2017.02.1
- Siemens Nucleus ReadyStart V4: before 4.1.1 — fixed in 4.1.1
- Siemens Nucleus Source Code: all versions
- Siemens Talon Tc Compact Firmware: all versions
- Siemens Talon Tc Modular Firmware: all versions
How to fix
Upgrade to a fixed version: Siemens Nucleus ReadyStart V3 2017.02.1; Siemens Nucleus ReadyStart V4 4.1.1. Check the vendor advisory for mitigations.
References
- https://cert-portal.siemens.com/productcert/html/ssa-044112.html
- https://cert-portal.siemens.com/productcert/html/ssa-114589.html
- https://cert-portal.siemens.com/productcert/html/ssa-223353.html
- https://cert-portal.siemens.com/productcert/html/ssa-620288.html
- https://cert-portal.siemens.com/productcert/html/ssa-845392.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-114589.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-223353.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-620288.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-845392.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-114589.pdf
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