{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-20196 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-20196 is a medium-severity vulnerability in Debian Debian Linux, published on 26 May 2021. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-20196 and fix it if it is affected.\n\nWhat it is: CVE-2021-20196 is a medium-severity vulnerability in Debian Debian Linux, published on 26 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-20196 in the wild and no public exploit code.\n\nAffected product: Debian Debian Linux. 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-2021-20196/ (Markdown: https://insights.sbomify.com/CVE-2021-20196/index.md)","id":"CVE-2021-20196","markdown":"https://insights.sbomify.com/CVE-2021-20196/index.md","name":"CVE-2021-20196","record":{"aliases":["DEBIAN-CVE-2021-20196","GHSA-ggpp-fxg5-wp87","RHSA-2022:0325","SUSE-SU-2022:0177-1","UBUNTU-CVE-2021-20196","openSUSE-SU-2022:0177-1"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"QEMU emulator","requires_auth":"low_privilege","summary":"A privileged guest user can crash the QEMU host process via a null pointer dereference in the floppy disk emulator, causing denial of service.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"qemu","vendor":"qemu"}],"cvss":{"score":6.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"A NULL pointer dereference flaw was found in the floppy disk emulator of QEMU. This issue occurs while processing read/write ioport commands if the selected floppy drive is not initialized with a block device. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.","ecosystems":["Red Hat:advanced_virtualization:8.4::el8","SUSE:Linux Enterprise Micro 5.1","SUSE:Linux Enterprise Module for Basesystem 15 SP3","SUSE:Linux Enterprise Module for Server Applications 15 SP3","openSUSE:Leap 15.3"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Null dereference in qemu","id":"CVE-2021-20196","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"debian:debian_linux","products":["debian:debian_linux","qemu:qemu"],"type":"null_dereference","year":"2021"},"n_packages":240,"n_references":5,"next":{"headline":"Race condition in binutils","id":"CVE-2021-20197"},"packages":[{"ecosystem":"Red Hat:advanced_virtualization:8.4::el8","fixed":["0:20200717-1.gite18ddad8.module+el8.4.0+8855+a9e237a9"],"introduced":["0"],"last_affected":[],"package":"SLOF","purl":"pkg:rpm/redhat/SLOF","source":"RHSA-2022:0325"},{"ecosystem":"Red Hat:advanced_virtualization:8.4::el8","fixed":["0:1.3.18-21.module+el8.4.0+11609+2eba841a"],"introduced":["0"],"last_affected":[],"package":"hivex","purl":"pkg:rpm/redhat/hivex","source":"RHSA-2022:0325"},{"ecosystem":"Red Hat:advanced_virtualization:8.4::el8","fixed":["0:1.3.18-21.module+el8.4.0+11609+2eba841a"],"introduced":["0"],"last_affected":[],"package":"hivex-debuginfo","purl":"pkg:rpm/redhat/hivex-debuginfo","source":"RHSA-2022:0325"},{"ecosystem":"Red Hat:advanced_virtualization:8.4::el8","fixed":["0:1.3.18-21.module+el8.4.0+11609+2eba841a"],"introduced":["0"],"last_affected":[],"package":"hivex-debugsource","purl":"pkg:rpm/redhat/hivex-debugsource","source":"RHSA-2022:0325"},{"ecosystem":"Red Hat:advanced_virtualization:8.4::el8","fixed":["0:1.3.18-21.module+el8.4.0+11609+2eba841a"],"introduced":["0"],"last_affected":[],"package":"hivex-devel","purl":"pkg:rpm/redhat/hivex-devel","source":"RHSA-2022:0325"},{"ecosystem":"Red Hat:advanced_virtualization:8.4::el8","fixed":["1:1.44.0-2.module+el8.4.0+10146+75917d2f"],"introduced":["0"],"last_affected":[],"package":"libguestfs","purl":"pkg:rpm/redhat/libguestfs","source":"RHSA-2022:0325"},{"ecosystem":"Red Hat:advanced_virtualization:8.4::el8","fixed":["1:1.44.0-2.module+el8.4.0+10146+75917d2f"],"introduced":["0"],"last_affected":[],"package":"libguestfs-bash-completion","purl":"pkg:rpm/redhat/libguestfs-bash-completion","source":"RHSA-2022:0325"},{"ecosystem":"Red Hat:advanced_virtualization:8.4::el8","fixed":["1:1.44.0-2.module+el8.4.0+10146+75917d2f"],"introduced":["0"],"last_affected":[],"package":"libguestfs-debuginfo","purl":"pkg:rpm/redhat/libguestfs-debuginfo","source":"RHSA-2022:0325"},{"ecosystem":"Red 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Hat:advanced_virtualization:8.4::el8","fixed":["1:1.44.0-2.module+el8.4.0+10146+75917d2f"],"introduced":["0"],"last_affected":[],"package":"libguestfs-rescue","purl":"pkg:rpm/redhat/libguestfs-rescue","source":"RHSA-2022:0325"},{"ecosystem":"Red Hat:advanced_virtualization:8.4::el8","fixed":["1:1.44.0-2.module+el8.4.0+10146+75917d2f"],"introduced":["0"],"last_affected":[],"package":"libguestfs-rsync","purl":"pkg:rpm/redhat/libguestfs-rsync","source":"RHSA-2022:0325"},{"ecosystem":"Red Hat:advanced_virtualization:8.4::el8","fixed":["1:1.44.0-2.module+el8.4.0+10146+75917d2f"],"introduced":["0"],"last_affected":[],"package":"libguestfs-tools","purl":"pkg:rpm/redhat/libguestfs-tools","source":"RHSA-2022:0325"},{"ecosystem":"Red Hat:advanced_virtualization:8.4::el8","fixed":["1:1.44.0-2.module+el8.4.0+10146+75917d2f"],"introduced":["0"],"last_affected":[],"package":"libguestfs-tools-c","purl":"pkg:rpm/redhat/libguestfs-tools-c","source":"RHSA-2022:0325"},{"ecosystem":"Red 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Control","id":"CVE-2015-3306","kev_date_added":"2026-10-08","published":"2015-05-18"},{"cvss_score":9.9,"headline":"RoundCube Webmail Deserialization of Untrusted Data","id":"CVE-2025-49113","kev_date_added":"2026-02-20","published":"2025-06-02"},{"cvss_score":9.8,"headline":"GNU InetUtils Argument Injection","id":"CVE-2026-24061","kev_date_added":"2026-01-26","published":"2026-01-21"},{"cvss_score":9.8,"headline":"Linux Kernel Improper Check for Unusual or Exceptional Conditions","id":"CVE-2025-39682","kev_date_added":"2026-09-18","published":"2025-09-05"},{"cvss_score":9.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2024-9680","kev_date_added":"2024-10-15","published":"2024-10-09"},{"cvss_score":9.8,"headline":"RARLAB UnRAR Directory Traversal","id":"CVE-2022-30333","kev_date_added":"2022-08-09","published":"2022-05-09"},{"cvss_score":9.8,"headline":"Roundcube Webmail SQL Injection","id":"CVE-2021-44026","kev_date_added":"2023-06-22","published":"2021-11-19"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["n/a"]},"summary":"A privileged guest user can crash the QEMU host process via a null pointer dereference in the floppy disk emulator, causing denial of service.","url":"https://insights.sbomify.com/CVE-2021-20196/"}