Security readout for executives and security teams
Plain-English summary
Certain Siemens SCALANCE industrial network switches can be disrupted by malformed OSPF routing traffic when OSPF is enabled. The issue is about network availability, not data theft, but outages in industrial or operational networks can have significant business impact.
Executive priority
Treat as a targeted operational resilience issue. Prioritize environments where affected Siemens switches support production, safety-adjacent, or site connectivity and OSPF is enabled.
Technical view
The affected SCALANCE XM/XR devices before V6.5 fail to verify checksum and length fields in OSPF Link State Update messages. An unauthenticated remote attacker could send crafted OSPF packets to interrupt network operation. The CVE maps to CWE-354 and requires OSPF to be enabled.
Likely exposure
Exposure is limited to listed Siemens SCALANCE XM408, XM416, XR524, XR526, XR528, and XR552 variants running versions below V6.5 with OSPF enabled. Devices not using OSPF are not described as exploitable by the supplied source.
Exploitation context
The source states unauthenticated remote exploitation is possible through crafted OSPF packets, but only when OSPF is enabled. The bundle does not cite public exploitation, proof of concept, or CISA KEV listing.
Researcher notes
Evidence is limited to the CVE record and Siemens advisory reference. No CVSS vector is provided in the bundle. Do not assume exploit availability or impact beyond network interruption from malformed OSPF LS Update handling.
Mitigation direction
- Check Siemens SSA-145224 for product-specific remediation guidance.
- Plan firmware update to V6.5 or later where applicable.
- Disable OSPF on affected devices if it is not required.
- Limit OSPF exposure to trusted routing domains where operationally possible.
Validation and detection
- Inventory SCALANCE XM/XR models and firmware versions.
- Confirm whether OSPF is enabled on each affected device.
- Prioritize devices below V6.5 that participate in OSPF routing.
- Review monitoring for unexplained OSPF instability or network interruptions.
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-354: 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-2021-37182 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://cert-portal.siemens.com/productcert/pdf/ssa-145224.pdfCVE reference · x_refsource_MISC
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 Validation of Integrity Check Value
Improper Validation of Integrity Check Value represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.