{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-40556 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2025-40556 yet. Limit exposure of the affected software until one is available.","what":"CVE-2025-40556 is a high-severity denial of service vulnerability in Siemens BACnet ATEC 550-440, published on 13 May 2025. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-40556 and fix it if it is affected.\n\nWhat it is: CVE-2025-40556 is a high-severity denial of service vulnerability in Siemens BACnet ATEC 550-440, published on 13 May 2025. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-40556 in the wild and no public exploit code.\n\nAffected product: Siemens BACnet ATEC 550-440. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2025-40556/ (Markdown: https://insights.sbomify.com/CVE-2025-40556/index.md)","id":"CVE-2025-40556","markdown":"https://insights.sbomify.com/CVE-2025-40556/index.md","name":"CVE-2025-40556","record":{"aliases":["GHSA-c7rq-qv3j-63j3"],"analysis":{"component_type":"ics_ot","fix_type":"no_fix_stated","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"BACnet MSTP device","requires_auth":"none","summary":"An attacker on the same BACnet network can cause a denial of service on Siemens ATEC devices by sending crafted MSTP messages, requiring a power cycle to recover.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"siemens","cpe":[],"cvss":{"score":7.1,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-20","name":"Improper Input Validation"}],"description":"A vulnerability has been identified in BACnet ATEC 550-440 (All versions), BACnet ATEC 550-441 (All versions), BACnet ATEC 550-445 (All versions), BACnet ATEC 550-446 (All versions). Affected devices improperly handle specific incoming BACnet MSTP messages. This could allow an attacker residing in the same BACnet network to send a specially crafted MSTP message that results in a denial of service condition of the targeted device. A power cycle is required to restore the device's normal operation.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Denial of service in BACnet ATEC 550-440","id":"CVE-2025-40556","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2025"},"n_packages":0,"n_references":1,"next":{"headline":"Security feature bypass in SIMATIC PCS neo V4.1","id":"CVE-2025-40566"},"packages":[],"prev":{"headline":"Denial of service in APOGEE PXC+TALON TC Series (BACnet)","id":"CVE-2025-40555"},"products":["BACnet ATEC 550-440","BACnet ATEC 550-441","BACnet ATEC 550-445","BACnet ATEC 550-446"],"published":"2025-05-13","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2025-05-13","vendors":["Siemens"]},"summary":"An attacker on the same BACnet network can cause a denial of service on Siemens ATEC devices by sending crafted MSTP messages, requiring a power cycle to recover.","url":"https://insights.sbomify.com/CVE-2025-40556/"}