{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-1439 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-1439 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-1439 is a high-severity denial of service vulnerability in Cisco Aironet Access Point Software (IOS XE Controller), published on 24 Mar 2021. 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-2021-1439 and fix it if it is affected.\n\nWhat it is: CVE-2021-1439 is a high-severity denial of service vulnerability in Cisco Aironet Access Point Software (IOS XE Controller), published on 24 Mar 2021. 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-2021-1439 in the wild and no public exploit code.\n\nAffected product: Cisco Aironet Access Point Software (IOS XE Controller). 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-2021-1439/ (Markdown: https://insights.sbomify.com/CVE-2021-1439/index.md)","id":"CVE-2021-1439","markdown":"https://insights.sbomify.com/CVE-2021-1439/index.md","name":"CVE-2021-1439","record":{"aliases":["GHSA-2p9c-p5jq-7j4g"],"analysis":{"component_type":"network_device","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"Cisco Aironet Access Point","requires_auth":"none","summary":"An adjacent attacker can cause a denial of service on Cisco Aironet Access Points by sending crafted mDNS packets, requiring FlexConnect local switching or mDNS VLAN configuration.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"cisco","cpe":[{"product":"aironet_access_point_software","vendor":"cisco"},{"product":"catalyst_9800_firmware","vendor":"cisco"}],"cvss":{"score":7.4,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-120","name":"Buffer Copy without Checking Size of Input"}],"description":"A vulnerability in the multicast DNS (mDNS) gateway feature of Cisco Aironet Series Access Points Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation of incoming mDNS traffic. An attacker could exploit this vulnerability by sending a crafted mDNS packet to an affected device through a wireless network that is configured in FlexConnect local switching mode or through a wired network on a configured mDNS VLAN. A successful exploit could allow the attacker to cause the access point (AP) to reboot, resulting in a DoS condition.","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":"Cisco Aironet Access Points FlexConnect Multicast DNS Denial of Service Vulnerability","id":"CVE-2021-1439","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Cisco IOS XR Software BGP Resource Public Key Infrastructure Denial of Service Vulnerability","id":"CVE-2021-1440"},"packages":[],"prev":{"headline":"Cisco Wide Area Application Services Software Information Disclosure Vulnerability","id":"CVE-2021-1438"},"products":["Cisco Aironet Access Point Software (IOS XE Controller)"],"published":"2021-03-24","related":[{"cvss_score":9.8,"headline":"Auth bypass in Cisco Mobility Express 1800 Access Point Series","id":"CVE-2017-3831","kev_date_added":null,"published":"2017-03-15"},{"cvss_score":8.6,"headline":"Cisco Embedded Wireless Controller with Catalyst Access Points IP Flood Denial of Service Vulnerability","id":"CVE-2022-20622","kev_date_added":null,"published":"2022-04-15"},{"cvss_score":8.6,"headline":"Denial of service in Cisco Aironet 1810, 1830, and 1850 Series Access Points","id":"CVE-2018-0234","kev_date_added":null,"published":"2018-05-02"},{"cvss_score":8.1,"headline":"Denial of service in n/a","id":"CVE-2016-1419","kev_date_added":null,"published":"2016-06-10"},{"cvss_score":7.8,"headline":"Privilege escalation in n/a","id":"CVE-2016-6362","kev_date_added":null,"published":"2016-08-22"},{"cvss_score":7.8,"headline":"Denial of service in n/a","id":"CVE-2015-6367","kev_date_added":null,"published":"2015-11-14"},{"cvss_score":7.5,"headline":"Cisco Aironet Access Points FlexConnect Upgrade Information Disclosure Vulnerability","id":"CVE-2021-1437","kev_date_added":null,"published":"2021-03-24"}],"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":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2024-11-08","vendors":["Cisco"]},"summary":"An adjacent attacker can cause a denial of service on Cisco Aironet Access Points by sending crafted mDNS packets, requiring FlexConnect local switching or mDNS VLAN configuration.","url":"https://insights.sbomify.com/CVE-2021-1439/"}