{"answers":{"affected":"1 open source package ship an affected version, including dnsmasq.","exploited":"There is no known exploitation of OSV-2021-1807 in the wild and no public exploit code.","fix":"No fix has been published for OSV-2021-1807 yet. Limit exposure of the affected software until one is available.","what":"OSV-2021-1807 is an use after free vulnerability in dnsmasq, published on 13 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for OSV-2021-1807 and fix it if it is affected.\n\nWhat it is: OSV-2021-1807 is an use after free vulnerability in dnsmasq, published on 13 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of OSV-2021-1807 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- dnsmasq (OSS-Fuzz): affected all versions; no fix listed\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/OSV-2021-1807/ (Markdown: https://insights.sbomify.com/OSV-2021-1807/index.md)","id":"OSV-2021-1807","markdown":"https://insights.sbomify.com/OSV-2021-1807/index.md","name":"OSV-2021-1807","record":{"aliases":[],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"DHCPv6 server","requires_auth":"none","summary":"A heap-use-after-free vulnerability in the DHCPv6 relay handling allows remote attackers to execute arbitrary code or cause a denial of service.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=44573\n\n```\nCrash type: Heap-use-after-free WRITE 1\nCrash state:\ndhcp6_no_relay\ndhcp6_maybe_relay\ndhcp6_maybe_relay\n```","ecosystems":["OSS-Fuzz"],"exploits":{"exploitdb":null,"first_seen":null,"github_poc":null,"max_poc_stars":null,"metasploit":null,"nuclei":null,"refs":[],"tier":null},"has_fix":false,"headline":"Heap-use-after-free in dhcp6_no_relay","id":"OSV-2021-1807","indexable":true,"kev":null,"kind":"advisory","links":{"ecosystem":"OSS-Fuzz","product":null,"products":[],"type":"use_after_free","year":"2022"},"n_packages":1,"n_references":null,"packages":[{"ecosystem":"OSS-Fuzz","fixed":[],"introduced":[],"last_affected":[],"package":"dnsmasq","purl":"pkg:generic/dnsmasq","source":"OSV-2021-1807"}],"products":null,"published":"2022-02-13","related":[],"sources":[{"class":"attribution","licence":"CC BY 4.0","name":"OSS-Fuzz","prefix":"OSV"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":null,"updated":null,"vendors":null},"summary":"A heap-use-after-free vulnerability in the DHCPv6 relay handling allows remote attackers to execute arbitrary code or cause a denial of service.","url":"https://insights.sbomify.com/OSV-2021-1807/"}