{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-40944 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2025-40944 yet. Limit exposure of the affected software until one is available.","what":"CVE-2025-40944 is a high-severity denial of service vulnerability in Siemens SIMATIC ET 200AL IM 157-1 PN, published on 13 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-40944 and fix it if it is affected.\n\nWhat it is: CVE-2025-40944 is a high-severity denial of service vulnerability in Siemens SIMATIC ET 200AL IM 157-1 PN, published on 13 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-40944 in the wild and no public exploit code.\n\nAffected product: Siemens SIMATIC ET 200AL IM 157-1 PN. 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-2025-40944/ (Markdown: https://insights.sbomify.com/CVE-2025-40944/index.md)","id":"CVE-2025-40944","markdown":"https://insights.sbomify.com/CVE-2025-40944/index.md","name":"CVE-2025-40944","record":{"aliases":["GHSA-vqmm-3555-wq2q"],"analysis":{"component_type":"ics_ot","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Siemens SIMATIC I/O modules","requires_auth":"none","summary":"An attacker can cause a denial-of-service condition on Siemens SIMATIC I/O modules by sending a specific S7 protocol disconnect request, 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":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/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-400","name":"Uncontrolled Resource Consumption"}],"description":"A vulnerability has been identified in SIMATIC ET 200AL IM 157-1 PN (6ES7157-1AB00-0AB0) (All versions), SIMATIC ET 200MP IM 155-5 PN HF (6ES7155-5AA00-0AC0) (All versions \u003e= V4.2.0), SIMATIC ET 200SP IM 155-6 MF HF (6ES7155-6MU00-0CN0) (All versions), SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants) (All versions \u003c V1.3), SIMATIC ET 200SP IM 155-6 PN R1 (6ES7155-6AU00-0HM0) (All versions \u003c V6.0.1), SIMATIC ET 200SP IM 155-6 PN/2 HF (6ES7155-6AU01-0CN0) (All versions \u003e= V4.2.0 \u003c V4.2.5), SIMATIC ET 200SP IM 155-6 PN/3 HF (6ES7155-6AU30-0CN0) (All versions \u003c V4.2.2), SIMATIC PN/MF Coupler (6ES7158-3MU10-0XA0) (All versions), SIMATIC PN/PN Coupler (6ES7158-3AD10-0XA0) (All versions \u003c V6.0.0), SIPLUS ET 200MP IM 155-5 PN HF (6AG1155-5AA00-2AC0) (All versions \u003e= V4.2.0), SIPLUS ET 200MP IM 155-5 PN HF (6AG1155-5AA00-7AC0) (All versions \u003e= V4.2.0), SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL (6AG2155-5AA00-1AC0) (All versions \u003e= V4.2.0), SIPLUS ET 200SP IM 155-6 PN HF (6AG1155-6AU01-2CN0) (All versions \u003e= V4.2.0 \u003c V4.2.5), SIPLUS ET 200SP IM 155-6 PN HF (6AG1155-6AU01-7CN0) (All versions \u003e= V4.2.0 \u003c V4.2.5), SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL (6AG2155-6AU01-1CN0) (All versions \u003e= V4.2.0 \u003c V4.2.5), SIPLUS ET 200SP IM 155-6 PN HF TX RAIL (6AG2155-6AU01-4CN0) (All versions \u003e= V4.2.0 \u003c V4.2.5), SIPLUS NET PN/PN Coupler (6AG2158-3AD10-4XA0) (All versions \u003c V6.0.0). Affected devices do not properly handle S7 protocol session disconnect requests. When receiving a valid S7 protocol Disconnect Request (COTP DR TPDU) on TCP port 102, the devices enter an improper session state.\r\n\r\nThis could allow an attacker to cause the device to become unresponsive, leading to a denial-of-service condition that requires a power cycle to restore 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 SIMATIC ET 200AL IM 157-1 PN","id":"CVE-2025-40944","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":"Privilege escalation in COMOS V10.4.5","id":"CVE-2025-40945"},"packages":[],"prev":{"headline":"Code injection in SIMATIC Drive Controller CPU 1504D TF","id":"CVE-2025-40943"},"products":["SIMATIC ET 200AL IM 157-1 PN","SIMATIC ET 200MP IM 155-5 PN HF","SIMATIC ET 200SP IM 155-6 MF HF","SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants)","SIMATIC ET 200SP IM 155-6 PN R1","SIMATIC ET 200SP IM 155-6 PN/2 HF","SIMATIC ET 200SP IM 155-6 PN/3 HF","SIMATIC PN/MF Coupler","SIMATIC PN/PN Coupler","SIPLUS ET 200MP IM 155-5 PN HF","SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL","SIPLUS ET 200SP IM 155-6 PN HF","SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL","SIPLUS ET 200SP IM 155-6 PN HF TX RAIL","SIPLUS NET PN/PN Coupler"],"published":"2026-01-13","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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-09","vendors":["Siemens"]},"summary":"An attacker can cause a denial-of-service condition on Siemens SIMATIC I/O modules by sending a specific S7 protocol disconnect request, requiring a power cycle to recover.","url":"https://insights.sbomify.com/CVE-2025-40944/"}