{"answers":{"affected":"It affects 3 products.","exploited":"There is no known exploitation of CVE-2021-34781 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-34781 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-34781 is a high-severity denial of service vulnerability in Cisco Secure Firewall Threat Defense, published on 27 Oct 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-2021-34781 and fix it if it is affected.\n\nWhat it is: CVE-2021-34781 is a high-severity denial of service vulnerability in Cisco Secure Firewall Threat Defense, published on 27 Oct 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-2021-34781 in the wild and no public exploit code.\n\nAffected product: Cisco Secure Firewall Threat Defense. 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-2021-34781/ (Markdown: https://insights.sbomify.com/CVE-2021-34781/index.md)","id":"CVE-2021-34781","markdown":"https://insights.sbomify.com/CVE-2021-34781/index.md","name":"CVE-2021-34781","record":{"aliases":["GHSA-cg69-5r4f-47q5"],"analysis":{"component_type":"network_device","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"Cisco FTD Software","requires_auth":"none","summary":"Unauthenticated remote attackers can cause denial of service on Cisco FTD devices by exhausting resources via crafted SSH connections in multi-instance deployments.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"cisco","cpe":[{"product":"firepower_management_center_virtual_appliance","vendor":"cisco"},{"product":"secure_firewall_threat_defense","vendor":"cisco"},{"product":"sourcefire_defense_center","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-119","name":"Improper Restriction of Operations within the Bounds of a Memory Buffer"}],"description":"A vulnerability in the processing of SSH connections for multi-instance deployments of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on the affected device. This vulnerability is due to a lack of proper error handling when an SSH session fails to be established. An attacker could exploit this vulnerability by sending a high rate of crafted SSH connections to the instance. A successful exploit could allow the attacker to cause resource exhaustion, which causes a DoS condition on the affected device. The device must be manually reloaded to recover.","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 Firepower Threat Defense Software SSH Connections Denial of Service Vulnerability","id":"CVE-2021-34781","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"cisco:secure_firewall_threat_defense","products":["cisco:secure_firewall_threat_defense"],"type":"denial_of_service","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Cisco DNA Center Information Disclosure Vulnerability","id":"CVE-2021-34782"},"packages":[],"prev":{"headline":"Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabilities","id":"CVE-2021-34780"},"products":["Cisco Adaptive Security Appliance (ASA) Software"],"published":"2021-10-27","related":[{"cvss_score":8.1,"headline":"Cisco Firepower Management Center Software Authenticated Directory Traversal Vulnerability","id":"CVE-2021-34762","kev_date_added":null,"published":"2021-10-27"},{"cvss_score":6.7,"headline":"Cisco Firepower Threat Defense Software Command Injection Vulnerabilities","id":"CVE-2021-34755","kev_date_added":null,"published":"2021-10-27"},{"cvss_score":6.7,"headline":"Cisco Firepower Threat Defense Software Command Injection Vulnerabilities","id":"CVE-2021-34756","kev_date_added":null,"published":"2021-10-27"},{"cvss_score":4.8,"headline":"Cisco Firepower Management Center Software Cross-Site Scripting and Open Redirect Vulnerabilities","id":"CVE-2021-34763","kev_date_added":null,"published":"2021-10-27"},{"cvss_score":4.8,"headline":"Cisco Firepower Management Center Software Cross-Site Scripting and Open Redirect Vulnerabilities","id":"CVE-2021-34764","kev_date_added":null,"published":"2021-10-27"},{"cvss_score":4.4,"headline":"Cisco Firepower Threat Defense Software CLI Arbitrary File Write Vulnerability","id":"CVE-2021-34761","kev_date_added":null,"published":"2021-10-27"}],"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 denial of service on Cisco FTD devices by exhausting resources via crafted SSH connections in multi-instance deployments.","url":"https://insights.sbomify.com/CVE-2021-34781/"}