{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2020-27720 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2020-27720 yet. Limit exposure of the affected software until one is available.","what":"CVE-2020-27720 is a high-severity denial of service vulnerability in F5 Big-Ip Carrier-Grade Nat, published on 24 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2020-27720 and fix it if it is affected.\n\nWhat it is: CVE-2020-27720 is a high-severity denial of service vulnerability in F5 Big-Ip Carrier-Grade Nat, published on 24 Dec 2020. 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-2020-27720 in the wild and no public exploit code.\n\nAffected product: F5 Big-Ip Carrier-Grade Nat. 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-2020-27720/ (Markdown: https://insights.sbomify.com/CVE-2020-27720/index.md)","id":"CVE-2020-27720","markdown":"https://insights.sbomify.com/CVE-2020-27720/index.md","name":"CVE-2020-27720","record":{"aliases":["GHSA-hp39-4vrr-9cjg"],"analysis":{"component_type":"network_device","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"BIG-IP LTM/CGNAT","requires_auth":"none","summary":"An attacker can cause a denial of service by sending specific traffic to BIG-IP LTM/CGNAT devices configured with non-default NAT66 settings.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"f5","cpe":[{"product":"big-ip_carrier-grade_nat","vendor":"f5"},{"product":"big-ip_local_traffic_manager","vendor":"f5"}],"cvss":{"score":7.5,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[],"description":"On BIG-IP LTM/CGNAT version 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.3, and 13.1.0-13.1.3.5, when processing NAT66 traffic with Port Block Allocation (PBA) mode and SP-DAG enabled, and dag-ipv6-prefix-len configured with a value less than the default of 128, an undisclosed traffic pattern may cause the Traffic Management Microkernel (TMM) to restart.","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":"Denial of service in BIG-IP LTM/CGNAT","id":"CVE-2020-27720","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"f5:big-ip_carrier-grade_nat","products":["f5:big-ip_carrier-grade_nat","f5:big-ip_local_traffic_manager"],"type":"denial_of_service","year":"2020"},"n_packages":0,"n_references":1,"next":{"headline":"Denial of service in BIG-IP GTM \u0026 DNS","id":"CVE-2020-27721"},"packages":[],"prev":{"headline":"Cross-site scripting in BIG-IP","id":"CVE-2020-27719"},"products":["BIG-IP LTM/CGNAT"],"published":"2020-12-24","related":[],"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":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["n/a"]},"summary":"An attacker can cause a denial of service by sending specific traffic to BIG-IP LTM/CGNAT devices configured with non-default NAT66 settings.","url":"https://insights.sbomify.com/CVE-2020-27720/"}