{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-20221 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-20221 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-20221 is a medium-severity vulnerability in Cisco Cyber Vision, published on 21 Oct 2026."},"fix_prompt":"Check this codebase for CVE-2026-20221 and fix it if it is affected.\n\nWhat it is: CVE-2026-20221 is a medium-severity vulnerability in Cisco Cyber Vision, published on 21 Oct 2026. \nExploitation: There is no known exploitation of CVE-2026-20221 in the wild and no public exploit code.\n\nAffected product: Cisco Cyber Vision. 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-2026-20221/ (Markdown: https://insights.sbomify.com/CVE-2026-20221/index.md)","id":"CVE-2026-20221","markdown":"https://insights.sbomify.com/CVE-2026-20221/index.md","name":"CVE-2026-20221","record":{"aliases":["GHSA-vm6m-qmxg-cg2c"],"analysis":null,"analysis_generated_by":null,"assigner":"cisco","cpe":[],"cvss":{"score":5.8,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"Multiple Cisco products are affected by a vulnerability in the generic routing encapsulation (GRE) tunnel decapsulation feature of the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause an unexpected restart of the Snort 3 Detection Engine.\r\n\r\nThis vulnerability is due to improper handling of nested GRE traffic. An attacker could exploit this vulnerability by sending a crafted GRE payload through an affected device. A successful exploit could allow the attacker to trigger an unexpected reload of the Snort 3 Detection Engine, resulting in either a bypass or denial of service (DoS) condition, depending on device configuration. For more information, see the  section of this advisory. The Snort 3 Detection Engine will restart automatically. No manual intervention is required.","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":"Multiple Cisco Products Snort 3 Generic Routing Encapsulation Denial of Service Vulnerabilities","id":"CVE-2026-20221","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Denial of service in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software","id":"CVE-2026-20222"},"packages":[],"prev":{"headline":"Cisco Crosswork Network Controller Remote Code Execution Vulnerability","id":"CVE-2026-20220"},"products":["Cisco Cyber Vision","Cisco Open Source Snort3","Cisco Secure Firewall Threat Defense (FTD) Software","Cisco UTD SNORT IPS Engine Software","Cisco Umbrella Insights Virtual Appliance"],"published":"2026-10-21","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-10-22","vendors":["Cisco"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-20221/"}