{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2020-4320 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2020-4320 yet. Limit exposure of the affected software until one is available.","what":"CVE-2020-4320 is a medium-severity authentication bypass vulnerability in Ibm Mq, published on 16 Jun 2020. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2020-4320 and fix it if it is affected.\n\nWhat it is: CVE-2020-4320 is a medium-severity authentication bypass vulnerability in Ibm Mq, published on 16 Jun 2020. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2020-4320 in the wild and no public exploit code.\n\nAffected product: Ibm Mq. 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-2020-4320/ (Markdown: https://insights.sbomify.com/CVE-2020-4320/index.md)","id":"CVE-2020-4320","markdown":"https://insights.sbomify.com/CVE-2020-4320/index.md","name":"CVE-2020-4320","record":{"aliases":["GHSA-h8p9-p3q3-7x89"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"IBM MQ Appliance","requires_auth":"low_privilege","summary":"Attackers can bypass client authentication restrictions in IBM MQ by exploiting improper SSLPEER certificate validation, allowing unauthorized access.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"ibm","cpe":[{"product":"mq","vendor":"ibm"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.0/AV:N/I:N/AC:H/S:U/PR:L/A:H/C:N/UI:N/RC:C/RL:O/E:U","version":"3.0"},"cwes":[{"id":"CWE-295","name":"Improper Certificate Validation"}],"description":"IBM MQ Appliance and IBM MQ AMQP Channels 8.0, 9.0 LTS, 9.1 LTS, and 9.1 CD do not correctly block or allow clients based on the certificate distinguished name SSLPEER setting. IBM X-Force ID: 177403.","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":"Auth bypass in MQ","id":"CVE-2020-4320","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"ibm:mq","products":["ibm:mq"],"type":"auth_bypass","year":"2020"},"n_packages":0,"n_references":2,"next":{"headline":"Cross-site request forgery in Security Secret Server","id":"CVE-2020-4322"},"packages":[],"prev":{"headline":"Information disclosure in MQ Appliance","id":"CVE-2020-4319"},"products":["MQ"],"published":"2020-06-16","related":[{"cvss_score":8.8,"headline":"IBM MQ queue manager is vulnerable to remote code execution","id":"CVE-2026-10575","kev_date_added":null,"published":"2026-09-18"},{"cvss_score":8.8,"headline":"IBM MQ queue manager is vulnerable to remote code execution","id":"CVE-2026-11375","kev_date_added":null,"published":"2026-09-18"},{"cvss_score":8.8,"headline":"IBM MQ queue manager is vulnerable to remote code execution","id":"CVE-2026-11378","kev_date_added":null,"published":"2026-09-18"},{"cvss_score":8.2,"headline":"XML external entity in MQ","id":"CVE-2022-22489","kev_date_added":null,"published":"2022-08-19"},{"cvss_score":8.1,"headline":"IBM MQ queue manager is vulnerable to unauthenticated remote code execution","id":"CVE-2026-10027","kev_date_added":null,"published":"2026-09-18"},{"cvss_score":8.1,"headline":"Deserialization in MQ","id":"CVE-2020-4682","kev_date_added":null,"published":"2021-01-28"},{"cvss_score":7.5,"headline":"IBM MQ queue manager is vulnerable to remote code execution","id":"CVE-2026-10853","kev_date_added":null,"published":"2026-09-18"}],"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)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-09-16","vendors":["IBM"]},"summary":"Attackers can bypass client authentication restrictions in IBM MQ by exploiting improper SSLPEER certificate validation, allowing unauthorized access.","url":"https://insights.sbomify.com/CVE-2020-4320/"}