{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-54429", "tracking": { "current_release_date": "2026-07-14T15:55:09.013536Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-54429", "initial_release_date": "2026-07-13T09:29:00.451450Z", "revision_history": [ { "date": "2026-07-13T09:29:00.451450Z", "number": "1", "summary": "NCSC Score created." }, { "date": "2026-07-14T10:26:18.832276Z", "number": "2", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)." }, { "date": "2026-07-14T10:26:22.368583Z", "number": "3", "summary": "NCSC Score updated." }, { "date": "2026-07-14T10:40:50.935898Z", "number": "4", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (1).| CWES updated (1)." }, { "date": "2026-07-14T10:40:54.068694Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-07-14T11:34:55.165977Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-07-14T12:47:43.903955Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| Product Remediations created (4).| References created (2).| CWES updated (1)." }, { "date": "2026-07-14T12:47:47.330494Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-07-14T13:43:28.905253Z", "number": "9", "summary": "Unknown change." }, { "date": "2026-07-14T13:58:33.018246Z", "number": "10", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-07-14T15:13:06.212482Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| Products connected (1).| Product Identifiers created (1).| References created (3)." }, { "date": "2026-07-14T15:13:10.640800Z", "number": "12", "summary": "NCSC Score updated." }, { "date": "2026-07-14T15:54:59.284670Z", "number": "13", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-07-14T15:55:08.203452Z", "number": "14", "summary": "NCSC Score updated." } ], "status": "interim", "version": "14" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/plcsim advanced", "product": { "name": "vers:unknown/plcsim advanced", "product_id": "CSAFPID-5774939", "product_identification_helper": { "cpe": "cpe:/h:siemens:simatic_s7:plcsim_advanced" } } } ], "category": "product_name", "name": "SIMATIC S7" }, { "branches": [ { "category": "product_version_range", "name": "vers:all/*", "product": { "name": "vers:all/*", "product_id": "CSAFPID-1266613" } }, { "category": "product_version_range", "name": "vers:unknown/<*", "product": { "name": "vers:unknown/<*", "product_id": "CSAFPID-1296975" } } ], "category": "product_name", "name": "SIMATIC S7-PLCSIM Advanced" } ], "category": "vendor", "name": "Siemens" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-54429", "cwe": { "id": "CWE-770", "name": "Allocation of Resources Without Limits or Throttling" }, "notes": [ { "category": "description", "text": "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.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/54xxx/CVE-2026-54429.json" }, { "category": "description", "text": "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.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-54429" }, { "category": "description", "text": "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.", "title": "siemens - https://cert-portal.siemens.com/productcert/csaf/ssa-828211.json" }, { "category": "other", "text": "0.00215", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "title": "CVSSV4" }, { "category": "other", "text": "6.0", "title": "CVSSV4 base score" }, { "category": "other", "text": "4.9", "title": "NCSC Score" }, { "category": "other", "text": "There is cvss data available from source Siemens, Is related to a product by vendor Siemens", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "There is cwe data available from source Nvd", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-1296975", "CSAFPID-1266613", "CSAFPID-5774939" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/54xxx/CVE-2026-54429.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-54429" }, { "category": "external", "summary": "Source - siemens", "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-828211.json" }, { "category": "external", "summary": "Source - ncscclear", "url": "https://advisories.ncsc.nl/advisory?id=NCSC-2026-0229" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2307.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Reference - certbundde; cveprojectv5; nvd; siemens", "url": "https://cert-portal.siemens.com/productcert/html/ssa-828211.html" }, { "category": "external", "summary": "Reference - siemens", "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-828211.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2307.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2307" } ], "remediations": [ { "category": "mitigation", "details": "Disable the S7-PLCSIM Virtual Switch binding on the network adapter used by the affected instance. This prevents the adapter from entering an external communication mode and removes the attack vector entirely. (see SIMATIC S7-PLCSIM Advanced Function Manual V8.0, 11/2025 Section 5.3 and Section 6.1.2.3; and SIMATIC S7-PLCSIM Advanced Function Manual API V8.0, 11/2025 Section 7.2)", "product_ids": [ "CSAFPID-1266613" ] }, { "category": "mitigation", "details": "Restrict multicast traffic on the network segment hosting the SIMATIC S7-PLCSIM Advanced host.", "product_ids": [ "CSAFPID-1266613" ] }, { "category": "mitigation", "details": "Use 'Softbus' / 'PLCSIM' network mode. This mode does not accept any packets from the network. This mode is a default network mode. (see SIMATIC S7-PLCSIM Advanced Function Manual V8.0, 11/2025 Section 5.0 and Section 5.1; and SIMATIC S7-PLCSIM Advanced Function Manual API V8.0, 11/2025 Section 7.2)", "product_ids": [ "CSAFPID-1266613" ] }, { "category": "none_available", "details": "Currently no fix is available", "product_ids": [ "CSAFPID-1266613" ] } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "baseScore": 7.4, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-1266613", "CSAFPID-1296975", "CSAFPID-5774939" ] } ], "title": "CVE-2026-54429" } ] }