CVE-2021-31345

7.5 HIGH 2% exploit odds Fix listed

What it is

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). The total length of an UDP 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 a user-defined applications that runs on top of the UDP protocol. (FSMD-2021-0006)

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure.
Exploit odds: 1.6% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-11-09 12:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:51 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 1.6% in the next 30 days (EPSS).
Severity: 7.5 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-11-09 12:15 UTC
Last modified: 2026-06-17 03:51 UTC
Exploit probability: 1.6% · EPSS, next 30 days
Weakness: CWE-1284
Record status: Modified

Affected

Siemens Capital Vstar
Siemens Nucleus Net
Siemens Nucleus Readystart v3 < 2014.12
Siemens Nucleus Source Code
Siemens Apogee Modular Building Controller Firmware
Siemens Apogee Modular Equiment Controller Firmware
Siemens Apogee Pxc Compact Firmware
Siemens Apogee Pxc Modular Firmware

Attack profile CVSS 3.1 · 7.5

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Is it in your code?

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Read https://cve-list.com/agent/cve/CVE-2021-31345.md and follow it. Check whether this project is affected by CVE-2021-31345. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record