{"answers":{"affected":"It affects 66 products.","exploited":"There is no known exploitation of CVE-2021-40127 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-40127 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-40127 is a medium-severity denial of service vulnerability in Cisco Small Business Smart and Managed Switches, published on 4 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-40127 and fix it if it is affected.\n\nWhat it is: CVE-2021-40127 is a medium-severity denial of service vulnerability in Cisco Small Business Smart and Managed Switches, published on 4 Nov 2021. 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-2021-40127 in the wild and no public exploit code.\n\nAffected product: Cisco Small Business Smart and Managed Switches. 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-2021-40127/ (Markdown: https://insights.sbomify.com/CVE-2021-40127/index.md)","id":"CVE-2021-40127","markdown":"https://insights.sbomify.com/CVE-2021-40127/index.md","name":"CVE-2021-40127","record":{"aliases":["GHSA-mq2g-mwpw-5386"],"analysis":{"component_type":"network_device","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Cisco Small Business Switch","requires_auth":"none","summary":"Unauthenticated remote attackers can cause a permanent denial of service on the web management interface of Cisco Small Business switches via crafted HTTP requests.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"cisco","cpe":[{"product":"sf200-24_firmware","vendor":"cisco"},{"product":"sf200-24fp_firmware","vendor":"cisco"},{"product":"sf200-24p_firmware","vendor":"cisco"},{"product":"sf200-48_firmware","vendor":"cisco"},{"product":"sf200-48p_firmware","vendor":"cisco"},{"product":"sf200e-24_firmware","vendor":"cisco"},{"product":"sf200e-24p_firmware","vendor":"cisco"},{"product":"sf200e-48_firmware","vendor":"cisco"},{"product":"sf200e-48p_firmware","vendor":"cisco"},{"product":"sf300-08_firmware","vendor":"cisco"},{"product":"sf300-24_firmware","vendor":"cisco"},{"product":"sf300-24mp_firmware","vendor":"cisco"},{"product":"sf300-24p_firmware","vendor":"cisco"},{"product":"sf300-24pp_firmware","vendor":"cisco"},{"product":"sf300-48_firmware","vendor":"cisco"},{"product":"sf300-48p_firmware","vendor":"cisco"},{"product":"sf300-48pp_firmware","vendor":"cisco"},{"product":"sf302-08_firmware","vendor":"cisco"},{"product":"sf302-08mp_firmware","vendor":"cisco"},{"product":"sf302-08mpp_firmware","vendor":"cisco"},{"product":"sf302-08p_firmware","vendor":"cisco"},{"product":"sf302-08pp_firmware","vendor":"cisco"},{"product":"sf500-24_firmware","vendor":"cisco"},{"product":"sf500-24mp_firmware","vendor":"cisco"},{"product":"sf500-24p_firmware","vendor":"cisco"},{"product":"sf500-48_firmware","vendor":"cisco"},{"product":"sf500-48mp_firmware","vendor":"cisco"},{"product":"sf500-48p_firmware","vendor":"cisco"},{"product":"sg200-08_firmware","vendor":"cisco"},{"product":"sg200-08p_firmware","vendor":"cisco"},{"product":"sg200-10fp_firmware","vendor":"cisco"},{"product":"sg200-18_firmware","vendor":"cisco"},{"product":"sg200-26_firmware","vendor":"cisco"},{"product":"sg200-26fp_firmware","vendor":"cisco"},{"product":"sg200-26p_firmware","vendor":"cisco"},{"product":"sg200-50_firmware","vendor":"cisco"},{"product":"sg200-50fp_firmware","vendor":"cisco"},{"product":"sg200-50p_firmware","vendor":"cisco"},{"product":"sg300-10_firmware","vendor":"cisco"},{"product":"sg300-10mp_firmware","vendor":"cisco"},{"product":"sg300-10mpp_firmware","vendor":"cisco"},{"product":"sg300-10p_firmware","vendor":"cisco"},{"product":"sg300-10pp_firmware","vendor":"cisco"},{"product":"sg300-20_firmware","vendor":"cisco"},{"product":"sg300-28_firmware","vendor":"cisco"},{"product":"sg300-28mp_firmware","vendor":"cisco"},{"product":"sg300-28p_firmware","vendor":"cisco"},{"product":"sg300-28pp_firmware","vendor":"cisco"},{"product":"sg300-28sfp_firmware","vendor":"cisco"},{"product":"sg300-52_firmware","vendor":"cisco"},{"product":"sg300-52mp_firmware","vendor":"cisco"},{"product":"sg300-52p_firmware","vendor":"cisco"},{"product":"sg300-sfp_firmware","vendor":"cisco"},{"product":"sg500-28_firmware","vendor":"cisco"},{"product":"sg500-28mpp_firmware","vendor":"cisco"},{"product":"sg500-28p_firmware","vendor":"cisco"},{"product":"sg500-52_firmware","vendor":"cisco"},{"product":"sg500-52mp_firmware","vendor":"cisco"},{"product":"sg500-52p_firmware","vendor":"cisco"},{"product":"sg500x-24_firmware","vendor":"cisco"},{"product":"sg500x-24mpp_firmware","vendor":"cisco"},{"product":"sg500x-24p_firmware","vendor":"cisco"},{"product":"sg500x-48_firmware","vendor":"cisco"},{"product":"sg500x-48mpp_firmware","vendor":"cisco"},{"product":"sg500x-48p_firmware","vendor":"cisco"},{"product":"sg500xg-8f8t_firmware","vendor":"cisco"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-20","name":"Improper Input Validation"}],"description":"A vulnerability in the web-based management interface of Cisco Small Business 200 Series Smart Switches, Cisco Small Business 300 Series Managed Switches, and Cisco Small Business 500 Series Stackable Managed Switches could allow an unauthenticated, remote attacker to render the web-based management interface unusable, resulting in a denial of service (DoS) condition. This vulnerability is due to improper validation of HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to cause a permanent invalid redirect for requests sent to the web-based management interface of the device, 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 Small Business 200, 300, and 500 Series Switches Web-Based Management Interface Denial of Service Vulnerability","id":"CVE-2021-40127","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 Webex Meetings Email Content Injection Vulnerability","id":"CVE-2021-40128"},"packages":[],"prev":{"headline":"Cisco Umbrella Email Enumeration Vulnerability","id":"CVE-2021-40126"},"products":["Cisco Small Business Smart and Managed Switches"],"published":"2021-11-04","related":[{"cvss_score":9.8,"headline":"Cisco Small Business Switches Privileged Access Vulnerability","id":"CVE-2018-15439","kev_date_added":null,"published":"2018-11-08"},{"cvss_score":8.6,"headline":"Cisco Small Business Smart and Managed Switches Denial of Service Vulnerability","id":"CVE-2020-3363","kev_date_added":null,"published":"2020-08-17"},{"cvss_score":8.1,"headline":"Cisco Small Business Smart and Managed Switches Session Management Vulnerability","id":"CVE-2020-3297","kev_date_added":null,"published":"2020-07-02"},{"cvss_score":8.1,"headline":"Cisco Small Business Smart and Managed Switches Cross-Site Request Forgery Vulnerability","id":"CVE-2019-12636","kev_date_added":null,"published":"2019-10-16"},{"cvss_score":7.5,"headline":"Cisco Small Business Switches Information Disclosure Vulnerability","id":"CVE-2019-15993","kev_date_added":null,"published":"2020-09-23"},{"cvss_score":7.2,"headline":"Cisco Small Business Switches Secure Shell Certificate Authentication Bypass Vulnerability","id":"CVE-2019-1859","kev_date_added":null,"published":"2019-05-03"},{"cvss_score":6.1,"headline":"Cisco Small Business Smart and Managed Switches Cross-Site Scripting Vulnerability","id":"CVE-2019-12718","kev_date_added":null,"published":"2019-10-16"}],"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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2024-11-07","vendors":["Cisco"]},"summary":"Unauthenticated remote attackers can cause a permanent denial of service on the web management interface of Cisco Small Business switches via crafted HTTP requests.","url":"https://insights.sbomify.com/CVE-2021-40127/"}