Security readout for executives and security teams
Plain-English summary
Certain Siemens SCALANCE industrial Ethernet switches generate web session identifiers and nonces insecurely. If the device webserver is reachable, an unauthenticated remote attacker may be able to guess a valid session and take over an existing administrator session.
Executive priority
Treat as a high-priority OT network maintenance issue, especially for switches managing production or safety-adjacent segments. Prioritize internet, vendor-accessible, and shared management networks first.
Technical view
CVE-2022-26647 is a CWE-330 weakness in the webserver session and nonce generation of listed Siemens SCALANCE X and XF devices. Affected firmware is below V5.5.2 for listed IRT models and below V5.2.6 for many other listed models. CVSS v3.1 is 8.8 high.
Likely exposure
Exposure is most likely where affected SCALANCE management webservers are reachable from enterprise, OT, vendor, or remote-access networks and remain below the fixed firmware versions.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation evidence. The vulnerability is remotely reachable, unauthenticated, and low complexity, but targets existing sessions and the CVSS vector includes required user interaction.
Researcher notes
Evidence supports insecure session ID and nonce generation with possible session hijacking, but does not provide exploitation details. Avoid assuming broader Siemens product impact beyond the listed SCALANCE models and versions.
Mitigation direction
- Identify all listed Siemens SCALANCE X and XF devices in OT networks.
- Upgrade affected IRT models to V5.5.2 or later where applicable.
- Upgrade other affected listed models to V5.2.6 or later where applicable.
- Restrict management webserver access to trusted administrative networks.
- Check Siemens SSA-310038 for model-specific firmware and guidance.
Validation and detection
- Compare device model and firmware against the affected product list.
- Confirm management webserver reachability from user, vendor, and remote-access networks.
- Verify upgraded devices report V5.5.2, V5.2.6, or later as applicable.
- Review administrative session activity for unexplained changes.
- Document compensating controls if firmware cannot be updated promptly.
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-330: 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-2022-26647 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
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
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:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- https://cert-portal.siemens.com/productcert/pdf/ssa-310038.pdfCVE 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.
Use of Insufficiently Random Values
Use of Insufficiently Random Values represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.