PatchSiren cyber security CVE debrief

CVE-2023-52887 Siemens CVE debrief

This CVE addresses a vulnerability in the Linux kernel's J1939 CAN (Controller Area Network) protocol implementation, specifically within the `xtp_rx_rts_session_new` function. The issue involves improper error handling when closely received RTS (Request to Send) messages are processed, which could lead to problematic session states. The fix replaces less informative kernel backtraces with a new method that provides clearer error messages and enables early termination of problematic sessions. While the CVSS score of 6.5 indicates medium severity, the CISA CSAF source marks the impact as 'Misinformed,' suggesting the actual risk may be lower than initially assessed or that the vulnerability's impact was misunderstood in earlier analysis. The vulnerability affects Siemens industrial networking products running SINEC OS, including the RUGGEDCOM RST2428P and SCALANCE X-family switches. Organizations should consult the Siemens ProductCERT advisory for specific patch availability and affected product configurations, as the advisory has undergone multiple revisions to clarify the scope of affected products.

Vendor: Siemens
Product: RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS: MEDIUM 6.5
CISA KEV: Not listed in stored evidence
Original CVE published: 2025-08-12
Original CVE updated: 2026-02-25
Advisory published: 2025-08-12
Advisory updated: 2026-02-25

Who should care

Organizations operating Siemens industrial networking equipment including RUGGEDCOM RST2428P switches and SCALANCE X-family managed switches (XC-300/XR-300/XC-400/XR-500WG/XR-500, XCM-/XRM-/XCH-/XRH-300 families) that utilize CAN/J1939 protocol support. OT security teams, industrial network administrators, and asset owners in manufacturing, energy, transportation, and critical infrastructure sectors using Siemens SINEC OS-based devices should prioritize verification of affected configurations.

Technical summary

The vulnerability exists in the Linux kernel's net/can/j1939 subsystem, specifically in the `xtp_rx_rts_session_new` function that handles RTS (Request to Send) message processing for J1939 transport protocol sessions. When RTS messages are received in close succession, the error handling mechanism previously generated uninformative kernel backtraces without properly terminating problematic sessions. The remediation replaces this approach with clearer error reporting and explicit early session termination to prevent resource exhaustion or undefined state conditions. This affects Siemens industrial networking products that incorporate the vulnerable kernel code through SINEC OS.

Defensive priority

medium

Recommended defensive actions

Review Siemens ProductCERT advisory SSA-355557 for detailed affected product configurations and patch availability
Verify if SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family devices in your environment are configured with affected J1939 CAN protocol features
Apply kernel updates or Siemens firmware patches as they become available to address the J1939 session handling vulnerability
Monitor CISA ICS advisories for additional guidance on industrial control system security practices
Implement network segmentation for CAN/J1939 networks to limit exposure of industrial communication protocols

Evidence notes

CVE published 2025-08-12 per CISA CSAF advisory ICSA-25-226-07. Advisory modified 2026-02-25 with republication based on Siemens ProductCERT SSA-355557. Impact marked 'Misinformed' in source threats data. Affected products include RUGGEDCOM RST2428P and SCALANCE X-family switches per CSAF product tree.

Sources and references

Verified primary and authoritative sources

CVE-2023-52887 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2023-52887

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2023-52887 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2023-52887

NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Source item URL
Unverified legacy reference

URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2025/icsa-25-226-07.json

cisa_csaf
Source reference
Unverified legacy reference

URL: https://cert-portal.siemens.com/productcert/csaf/ssa-355557.json

Reference
Source reference
Unverified legacy reference

URL: https://cert-portal.siemens.com/productcert/html/ssa-355557.html

Reference
Source reference
Unverified legacy reference

URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-226-07

Reference
Source reference
Unverified legacy reference

URL: https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01

Reference
Source reference
Unverified legacy reference

URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

Reference
Source reference
Unverified legacy reference

URL: https://www.cisa.gov/topics/industrial-control-systems

Reference
Source reference
Unverified legacy reference

URL: https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

Reference

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.