← Vulnerability feed

Vulnerability record · CVE-2021-31883 · published 9 November 2021

CVE-2021-31883: Siemens capital vstar memory buffer overflow vulnerability

Siemens · Capital Vstar

A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303). When processing a DHCP ACK message, the DHCP client application does not validate the length of the Vendor option(s), leading to Denial-of-Service conditions. (FSMD-2021-0013)

7.5 CVSS 3.1 High EPSS 1.5% · top 26.3% CWE-119 · Memory buffer overflow
7.5CVSS 3.1 base score, v2 5.0
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
10Affected product versions listed by NVD
9References
17 Jun 2026Last modified by NVD

Description

A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303). When processing a DHCP ACK message, the DHCP client application does not validate the length of the Vendor option(s), leading to Denial-of-Service conditions. (FSMD-2021-0013)

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

Affected products

10 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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-620288.html
https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-114589.pdf Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-620288.pdf
https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-114589.pdf Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-620288.pdf

Track CVE-2021-31883 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-31884Siemens capital vstar vulnerabilityA vulnerability has been identified in APOGEE MBC (PPC) (BACnet) (All versions), APOGEE MBC (PPC) (P2 Ethernet) (All versions), APOGEE MEC (PPC) (BAC…EPSS 1.5%9.8CVE-2021-31886Siemens nucleus net out-of-bounds write vulnerabilityA vulnerability has been identified in APOGEE MBC (PPC) (BACnet) (All versions), APOGEE MBC (PPC) (P2 Ethernet) (All versions), APOGEE MEC (PPC) (BAC…EPSS 3.0%9.1CVE-2021-31345Siemens capital vstar vulnerabilityA vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303),…EPSS 1.6%9.1CVE-2021-31346Siemens capital vstar vulnerabilityA vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303),…EPSS 2.0%9.1CVE-2021-31889Siemens capital vstar vulnerabilityA vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303),…EPSS 2.2%9.1CVE-2021-31890Siemens capital vstar vulnerabilityA vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303),…EPSS 2.2%8.8CVE-2021-31887Siemens nucleus net out-of-bounds write vulnerabilityA vulnerability has been identified in APOGEE MBC (PPC) (BACnet) (All versions), APOGEE MBC (PPC) (P2 Ethernet) (All versions), APOGEE MEC (PPC) (BAC…EPSS 2.4%8.8CVE-2021-31888Siemens nucleus net out-of-bounds write vulnerabilityA vulnerability has been identified in APOGEE MBC (PPC) (BACnet) (All versions), APOGEE MBC (PPC) (P2 Ethernet) (All versions), APOGEE MEC (PPC) (BAC…EPSS 2.4%

Source: NIST National Vulnerability Database (record CVE-2021-31883), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.