{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2023-20243 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2023-20243 yet. Limit exposure of the affected software until one is available.","what":"CVE-2023-20243 is a high-severity denial of service vulnerability in Cisco Identity Services Engine, published on 6 Sep 2023. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2023-20243 and fix it if it is affected.\n\nWhat it is: CVE-2023-20243 is a high-severity denial of service vulnerability in Cisco Identity Services Engine, published on 6 Sep 2023. 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-2023-20243 in the wild and no public exploit code.\n\nAffected product: Cisco Identity Services Engine. 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-2023-20243/ (Markdown: https://insights.sbomify.com/CVE-2023-20243/index.md)","id":"CVE-2023-20243","markdown":"https://insights.sbomify.com/CVE-2023-20243/index.md","name":"CVE-2023-20243","record":{"aliases":["GHSA-64jj-6hmj-39jw"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Cisco ISE","requires_auth":"none","summary":"Unauthenticated remote attackers can cause Cisco ISE to stop processing RADIUS packets, denying network access to legitimate users.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"cisco","cpe":[{"product":"identity_services_engine","vendor":"cisco"}],"cvss":{"score":8.6,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-755","name":"Improper Handling of Exceptional Conditions"},{"id":"CWE-399","name":null}],"description":"A vulnerability in the RADIUS message processing feature of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to cause the affected system to stop processing RADIUS packets.\r\n\r This vulnerability is due to improper handling of certain RADIUS accounting requests. An attacker could exploit this vulnerability by sending a crafted authentication request to a network access device (NAD) that uses Cisco ISE for authentication, authorization, and accounting (AAA). This would eventually result in the NAD sending a RADIUS accounting request packet to Cisco ISE. An attacker could also exploit this vulnerability by sending a crafted RADIUS accounting request packet to Cisco ISE directly if the RADIUS shared secret is known. A successful exploit could allow the attacker to cause the RADIUS process to unexpectedly restart, resulting in authentication or authorization timeouts and denying legitimate users access to the network or service. Clients already authenticated to the network would not be affected.\r\n\r Note: To recover the ability to process RADIUS packets, a manual restart of the affected Policy Service Node (PSN) may be required. For more information, see the Details [\"#details\"] section of this advisory.","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 Cisco Identity Services Engine Software","id":"CVE-2023-20243","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"cisco:identity_services_engine","products":["cisco:identity_services_engine"],"type":"denial_of_service","year":"2023"},"n_packages":0,"n_references":1,"next":{"headline":"Denial of service in Cisco Firepower Threat Defense Software","id":"CVE-2023-20244"},"packages":[],"prev":{"headline":"Cross-site scripting in Cisco Unified Communications Manager","id":"CVE-2023-20242"},"products":["Cisco Identity Services Engine Software"],"published":"2023-09-06","related":[{"cvss_score":10,"headline":"Cisco Identity Services Engine Incorrect Use of Privileged APIs","id":"CVE-2026-76460","kev_date_added":"2026-09-16","published":"2026-09-16"},{"cvss_score":10,"headline":"Cisco Identity Services Engine Injection","id":"CVE-2025-20337","kev_date_added":"2025-07-28","published":"2025-07-16"},{"cvss_score":10,"headline":"Cisco Identity Services Engine Injection","id":"CVE-2025-20281","kev_date_added":"2025-07-28","published":"2025-06-25"},{"cvss_score":10,"headline":"Cisco Identity Services Engine Hardening Release - Improper Neutralization Vulnerabilities","id":"CVE-2026-20130","kev_date_added":null,"published":"2026-09-16"},{"cvss_score":10,"headline":"Cisco Identity Services Engine Hardening Release - Access Control Vulnerabilities","id":"CVE-2026-20192","kev_date_added":null,"published":"2026-09-16"},{"cvss_score":10,"headline":"Cisco ISE API Unauthenticated Remote Code Execution Vulnerability","id":"CVE-2025-20282","kev_date_added":null,"published":"2025-06-25"},{"cvss_score":10,"headline":"Hardcoded credentials in n/a","id":"CVE-2011-3290","kev_date_added":null,"published":"2011-09-21"}],"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":"2024-08-02","vendors":["Cisco"]},"summary":"Unauthenticated remote attackers can cause Cisco ISE to stop processing RADIUS packets, denying network access to legitimate users.","url":"https://insights.sbomify.com/CVE-2023-20243/"}