{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-34741 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-34741 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-34741 is a high-severity denial of service vulnerability in Cisco Asyncos, 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-2021-34741 and fix it if it is affected.\n\nWhat it is: CVE-2021-34741 is a high-severity denial of service vulnerability in Cisco Asyncos, 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-2021-34741 in the wild and no public exploit code.\n\nAffected product: Cisco Asyncos. 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-2021-34741/ (Markdown: https://insights.sbomify.com/CVE-2021-34741/index.md)","id":"CVE-2021-34741","markdown":"https://insights.sbomify.com/CVE-2021-34741/index.md","name":"CVE-2021-34741","record":{"aliases":["GHSA-mcrm-m53h-jvp2"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Cisco Email Security Appliance","requires_auth":"none","summary":"Unauthenticated remote attackers can cause a denial of service on Cisco Email Security Appliances by sending crafted emails that exhaust CPU resources.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"cisco","cpe":[{"product":"asyncos","vendor":"cisco"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"}],"description":"A vulnerability in the email scanning algorithm of Cisco AsyncOS software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to perform a denial of service (DoS) attack against an affected device. This vulnerability is due to insufficient input validation of incoming emails. An attacker could exploit this vulnerability by sending a crafted email through Cisco ESA. A successful exploit could allow the attacker to exhaust all the available CPU resources on an affected device for an extended period of time, preventing other emails from being processed and 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 Email Security Appliance Denial of Service Vulnerability","id":"CVE-2021-34741","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"cisco:asyncos","products":["cisco:asyncos"],"type":"denial_of_service","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Cisco Vision Dynamic Signage Director Reflected Cross-Site Scripting Vulnerability","id":"CVE-2021-34742"},"packages":[],"prev":{"headline":"Cisco Aironet Access Points WLAN Control Protocol Packet Buffer Leak Denial of Service Vulnerability","id":"CVE-2021-34740"},"products":["Cisco Email Security Appliance (ESA)"],"published":"2021-11-04","related":[{"cvss_score":10,"headline":"Cisco Multiple Products Improper Input Validation","id":"CVE-2025-20393","kev_date_added":"2025-12-17","published":"2025-12-17"},{"cvss_score":9.8,"headline":"Cisco Secure Email Gateway Relative Path Traversal","id":"CVE-2026-76519","kev_date_added":"2026-10-14","published":"2026-10-14"},{"cvss_score":9.8,"headline":"Cisco Secure Email Gateway SQL Injection","id":"CVE-2026-76461","kev_date_added":"2026-09-14","published":"2026-09-14"},{"cvss_score":8.8,"headline":"Command injection in Cisco Secure Web Appliance","id":"CVE-2024-20435","kev_date_added":null,"published":"2024-07-17"},{"cvss_score":8.8,"headline":"Cisco Web Security Appliance Unauthorized Device Reset Vulnerability","id":"CVE-2019-15956","kev_date_added":null,"published":"2019-11-26"},{"cvss_score":8.6,"headline":"Cisco Web Security Appliance Proxy Service Denial of Service Vulnerability","id":"CVE-2021-34698","kev_date_added":null,"published":"2021-10-06"},{"cvss_score":8.6,"headline":"Cisco Email Security Appliance Denial of Service Vulnerability","id":"CVE-2019-1947","kev_date_added":null,"published":"2020-09-23"}],"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 denial of service on Cisco Email Security Appliances by sending crafted emails that exhaust CPU resources.","url":"https://insights.sbomify.com/CVE-2021-34741/"}