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CVE-2024-26015 Siemens CVE debrief

An incorrect parsing of numbers with different radices vulnerability (CWE-1389) in Fortinet FortiProxy and FortiOS IP address validation features may allow an unauthenticated attacker to bypass IP blocklist protections via crafted requests. This vulnerability affects Siemens RUGGEDCOM APE1808, which incorporates the affected Fortinet components. The issue stems from improper handling of numeric values with different radix bases during IP address validation, potentially allowing attackers to circumvent access controls designed to block malicious IP addresses. The vulnerability was initially published on July 9, 2024, with subsequent advisory revisions through November 2025 adding related upstream vulnerabilities and clarifying fix information. Siemens has released a vendor fix requiring update of the Fortigate NGFW component to version 7.4.4, available through customer support.

Vendor
Siemens
Product
RUGGEDCOM APE1808
CVSS
LOW 3.4
CISA KEV
Not listed in stored evidence
Original CVE published
2024-07-09
Original CVE updated
2026-01-14
Advisory published
2024-07-09
Advisory updated
2026-01-14

Who should care

Organizations operating Siemens RUGGEDCOM APE1808 industrial networking devices, particularly in critical infrastructure environments where IP blocklists are relied upon for access control. Security teams responsible for OT/ICS network segmentation and firewall policy enforcement should prioritize this fix to maintain integrity of IP-based blocking mechanisms.

Technical summary

The vulnerability exists in the IP address validation feature of FortiProxy (versions 7.4.3 and below, 7.2.10 and below, 7.0.17 and below) and FortiOS (versions 7.4.3 and below, 7.2.8 and below, 7.0.15 and below). Incorrect parsing of numbers with different radices (CWE-1389) allows crafted requests to bypass IP blocklist enforcement. This is an unauthenticated attack vector with CVSS 3.1 score of 3.4 (Low severity), requiring adjacent network access and high attack complexity. The vulnerability affects Siemens RUGGEDCOM APE1808, which integrates Fortinet NGFW components. Successful exploitation could allow attackers to circumvent IP-based access controls, though the scope is changed due to the chained nature of the vulnerability.

Defensive priority

medium

Recommended defensive actions

  • Contact Siemens customer support to obtain patch and update information for Fortigate NGFW V7.4.4
  • Apply vendor fix to update Fortigate NGFW component to version 7.4.4 on affected RUGGEDCOM APE1808 systems
  • Review and validate IP blocklist configurations after patching to ensure expected enforcement behavior
  • Monitor network traffic for anomalous patterns that may indicate attempted IP validation bypass
  • Implement defense-in-depth controls per CISA ICS recommended practices to supplement vendor fixes

Evidence notes

CVE published 2024-07-09; CISA ICS advisory ICSA-24-193-02 published same date. Advisory revised multiple times through 2025-11-11 to add related CVEs and correct fix information. Vendor fix specified in remediation data: update Fortigate NGFW to V7.4.4.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-26015 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-26015

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2024-26015 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-26015

    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/2024/icsa-24-193-02.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-698820.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-698820.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-24-193-02

    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.