Security readout for executives and security teams
Plain-English summary
This Siemens vulnerability can crash or disrupt affected embedded automotive software when it processes a malformed DHCP network response. The business impact is availability, not data theft. Exposure is mainly in local or adjacent network environments where the affected DHCP client can receive DHCP ACK packets.
Executive priority
Treat this as a targeted availability risk for embedded or OT environments, not a broad internet-facing emergency. Prioritize systems where downtime affects safety, operations, delivery, or customer commitments.
Technical view
The DHCP client in Siemens Capital Embedded AR Classic does not validate the length of DNS option 0x06 in DHCP ACK packets. CVSS 3.1 is 6.5: adjacent network, low complexity, no privileges or user interaction, high availability impact, no confidentiality or integrity impact.
Likely exposure
Organizations using Capital Embedded AR Classic 431-422 all versions or R20-11 versions before V2303 may be exposed, especially where DHCP is enabled on reachable local networks.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. Exploitation requires adjacent-network ability to deliver relevant DHCP ACK traffic to the affected client.
Researcher notes
The record identifies CWE-119 and a DHCP option length validation flaw. The bundle gives limited product-remediation detail beyond R20-11 before V2303, so avoid assuming fixes for 431-422 without Siemens confirmation.
Mitigation direction
- Upgrade Capital Embedded AR Classic R20-11 to V2303 or later where applicable.
- For 431-422, check current Siemens advisory guidance and support options.
- Restrict DHCP service to trusted network segments and authorized DHCP servers.
- Monitor affected OT or embedded networks for unexpected DHCP behavior.
- Prioritize compensating controls where no fixed 431-422 version is identified.
Validation and detection
- Inventory Siemens Capital Embedded AR Classic deployments and versions.
- Confirm whether DHCP client functionality is enabled in affected environments.
- Verify R20-11 installations are V2303 or later.
- Review Siemens advisory SSA-114589 and related references for current product guidance.
- Check network architecture for untrusted adjacent DHCP access paths.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-119: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-31882 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://cert-portal.siemens.com/productcert/pdf/ssa-114589.pdfCVE reference · x_refsource_MISC
- https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdfCVE reference · x_refsource_MISC
- https://cert-portal.siemens.com/productcert/pdf/ssa-620288.pdfCVE reference · x_refsource_MISC
- https://cert-portal.siemens.com/productcert/html/ssa-114589.htmlCVE reference
- https://cert-portal.siemens.com/productcert/html/ssa-044112.htmlCVE reference
- https://cert-portal.siemens.com/productcert/html/ssa-620288.htmlCVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Restriction of Operations within the Bounds of a Memory Buffer
Improper Restriction of Operations within the Bounds of a Memory Buffer represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.