{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2017-6026 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2017-6026 yet. Limit exposure of the affected software until one is available.","what":"CVE-2017-6026 is a critical vulnerability in Schneider Electric Modicon PLCs, published on 30 Jun 2017. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2017-6026 and fix it if it is affected.\n\nWhat it is: CVE-2017-6026 is a critical vulnerability in Schneider Electric Modicon PLCs, published on 30 Jun 2017. 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-2017-6026 in the wild and no public exploit code.\n\nAffected product: Schneider Electric Modicon PLCs. 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-2017-6026/ (Markdown: https://insights.sbomify.com/CVE-2017-6026/index.md)","id":"CVE-2017-6026","markdown":"https://insights.sbomify.com/CVE-2017-6026/index.md","name":"CVE-2017-6026","record":{"aliases":["GHSA-c4x2-m5w5-m3rx"],"analysis":{"component_type":"ics_ot","fix_type":"upgrade","impacts":["account_takeover","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Schneider Electric PLC","requires_auth":"none","summary":"Insufficiently random session numbers in Schneider Electric Modicon PLCs allow attackers to compromise active user sessions.","user_interaction":"not_required","vuln_class":"weak_cryptography"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"icscert","cpe":[{"product":"modicon_m241_firmware","vendor":"schneider-electric"},{"product":"modicon_m251_firmware","vendor":"schneider-electric"}],"cvss":{"score":9.1,"severity":"critical","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-330","name":"Use of Insufficiently Random Values"}],"description":"A Use of Insufficiently Random Values issue was discovered in Schneider Electric Modicon PLCs Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to Version 4.0.5.11. The session numbers generated by the web application are lacking randomization and are shared between several users. This may allow a current session to be compromised.","ecosystems":[],"exploits":{"exploitdb":1,"first_seen":"2018-11-30","github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[{"date":"2018-11-30","kind":"exploitdb","ref":"45918","stars":null,"title":"Schneider Electric PLC - Session Calculation Authentication Bypass"}],"tier":"poc_unverified"},"has_fix":null,"headline":"Weak cryptography in Schneider Electric Modicon PLCs","id":"CVE-2017-6026","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"weak_cryptography","year":"2017"},"n_packages":0,"n_references":3,"next":{"headline":"File upload in 3S-Smart Software Solutions GmbH CODESYS Web Server","id":"CVE-2017-6027"},"packages":[],"prev":{"headline":"Memory corruption in 3S-Smart Software Solutions GmbH CODESYS Web Server","id":"CVE-2017-6025"},"products":["Schneider Electric Modicon PLCs"],"published":"2017-06-30","related":[{"cvss_score":9.8,"headline":"Hardcoded credentials in Schneider Electric Modicon PLCs","id":"CVE-2017-6028","kev_date_added":null,"published":"2017-06-30"},{"cvss_score":7.5,"headline":"Denial of service in Modicon M241/M251 logic controllers firmware prior to V5.1.9.1","id":"CVE-2021-22699","kev_date_added":null,"published":"2021-05-26"},{"cvss_score":6.9,"headline":"Denial of service in Modicon M241/M251","id":"CVE-2025-13901","kev_date_added":null,"published":"2026-03-10"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"attribution","licence":"GPL-2.0-or-later","name":"Exploit-DB"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-05","vendors":["n/a"]},"summary":"Insufficiently random session numbers in Schneider Electric Modicon PLCs allow attackers to compromise active user sessions.","url":"https://insights.sbomify.com/CVE-2017-6026/"}