Vulnerability in SIMATIC S7-PLCSIM Advanced (CVE-2026-54429)
Summary
Vulnerability in SIMATIC S7-PLCSIM Advanced (CVE-2026-54429). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
A vulnerability has been identified in SIMATIC S7-PLCSIM Advanced (All versions). Affected devices do not properly handle high-volume multicast network traffic, which can exhaust available memory resources in the affected application. This could allow an unauthenticated attacker on the local network segment to cause a denial-of-service condition of the affected application. The affected application becomes inaccessible and requires a manual restart; no project data is lost. Successful exploitation requires a specific project configuration to be already active on the targeted instance.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-54429 has been found in SIMATIC S7-PLCSIM Advanced.
Risk of unauthorized operations or information disclosure. CVSS score: 7.4/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "SIMATIC S7-PLCSIM Advanced CVE-2026-54429" on the vendor's site.
CVE-2026-54429 (SIMATIC S7-PLCSIM Advanced) — CWE-770 / CVSS v3 7.4
Attack vector: adjacent-network / unauthenticated / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-770) exists in SIMATIC S7-PLCSIM Advanced.
Check the vendor advisory for the affected versions of SIMATIC S7-PLCSIM Advanced.
Severity: High (CVSS 7.4/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで SIMATIC S7-PLCSIM Advanced を使っているサービスとバージョンを洗い出す。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- ICSA cisa.gov
- web productcert@siemens.com
- web nvd.nist.gov
- web github.com