{"answers":{"affected":"It affects 15 products.","exploited":"There is no known exploitation of CVE-2021-25219 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2021-25219 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 27 Oct 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-2021-25219 and fix it if it is affected.\n\nWhat it is: CVE-2021-25219 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 27 Oct 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-2021-25219 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-2021-25219/ (Markdown: https://insights.sbomify.com/CVE-2021-25219/index.md)","id":"CVE-2021-25219","markdown":"https://insights.sbomify.com/CVE-2021-25219/index.md","name":"CVE-2021-25219","record":{"aliases":["ALPINE-CVE-2021-25219","ALSA-2022:2092","AZL-6327","CLSA-2021-1635957830","CLSA-2021-1637070791","CLSA-2021-1639681836","CLSA-2022-1654175851","CLSA-2022-1654511849","DEBIAN-CVE-2021-25219","DSA-4994-1","GHSA-x6vq-rxvf-3ggc","MGASA-2021-0560","OESA-2021-1459","RHSA-2022:2092","RLSA-2022:2092","SUSE-SU-2021:3657-1","SUSE-SU-2021:3773-1","SUSE-SU-2022:0151-1","UBUNTU-CVE-2021-25219","USN-5126-1","USN-5126-2","openSUSE-SU-2021:1502-1","openSUSE-SU-2021:3773-1","openSUSE-SU-2022:0151-1","openSUSE-SU-2024:11660-1"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"DNS resolver software","requires_auth":"none","summary":"Attackers can degrade BIND resolver performance by exploiting a flaw in lame cache data structures, causing significant delays in client query processing.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"isc","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"fedora","vendor":"fedoraproject"},{"product":"bind","vendor":"isc"},{"product":"cloud_backup","vendor":"netapp"},{"product":"h300e_firmware","vendor":"netapp"},{"product":"h300s_firmware","vendor":"netapp"},{"product":"h410c_firmware","vendor":"netapp"},{"product":"h410s_firmware","vendor":"netapp"},{"product":"h500e_firmware","vendor":"netapp"},{"product":"h500s_firmware","vendor":"netapp"},{"product":"h700e_firmware","vendor":"netapp"},{"product":"h700s_firmware","vendor":"netapp"},{"product":"http_server","vendor":"oracle"},{"product":"zfs_storage_appliance_kit","vendor":"oracle"},{"product":"sinec_infrastructure_network_services","vendor":"siemens"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[],"description":"In BIND 9.3.0 -\u003e 9.11.35, 9.12.0 -\u003e 9.16.21, and versions 9.9.3-S1 -\u003e 9.11.35-S1 and 9.16.8-S1 -\u003e 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.","ecosystems":["AlmaLinux:8","Red Hat:enterprise_linux:8::appstream","Red Hat:enterprise_linux:8::baseos","Rocky Linux:8","SUSE:Linux Enterprise Module for Basesystem 15 SP2","SUSE:Linux Enterprise Module for Basesystem 15 SP3","SUSE:Linux Enterprise Module for Server Applications 15 SP2","SUSE:Linux Enterprise Module for Server Applications 15 SP3","SUSE:Linux Enterprise Server 12 SP5","SUSE:Linux Enterprise Server for SAP Applications 12 SP5","SUSE:Linux Enterprise Software Development Kit 12 SP5","SUSE:Package Hub 15 SP3","openSUSE:Leap 15.2","openSUSE:Leap 15.3","openSUSE:Tumbleweed"],"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":"Lame cache can be abused to severely degrade resolver performance","id":"CVE-2021-25219","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"debian:debian_linux","products":["debian:debian_linux","fedoraproject:fedora","isc:bind","netapp:cloud_backup","netapp:h300e_firmware","netapp:h300s_firmware","netapp:h410c_firmware","netapp:h410s_firmware","netapp:h500e_firmware","netapp:h500s_firmware","netapp:h700e_firmware","netapp:h700s_firmware","oracle:http_server","oracle:zfs_storage_appliance_kit","siemens:sinec_infrastructure_network_services"],"type":"denial_of_service","year":"2021"},"n_packages":69,"n_references":10,"next":{"headline":"DNS forwarders - cache poisoning vulnerability","id":"CVE-2021-25220"},"packages":[{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind","purl":"pkg:rpm/almalinux/bind","source":"ALSA-2022:2092"},{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-chroot","purl":"pkg:rpm/almalinux/bind-chroot","source":"ALSA-2022:2092"},{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-devel","purl":"pkg:rpm/almalinux/bind-devel","source":"ALSA-2022:2092"},{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-export-devel","purl":"pkg:rpm/almalinux/bind-export-devel","source":"ALSA-2022:2092"},{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-export-libs","purl":"pkg:rpm/almalinux/bind-export-libs","source":"ALSA-2022:2092"},{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-libs","purl":"pkg:rpm/almalinux/bind-libs","source":"ALSA-2022:2092"},{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-libs-lite","purl":"pkg:rpm/almalinux/bind-libs-lite","source":"ALSA-2022:2092"},{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-license","purl":"pkg:rpm/almalinux/bind-license","source":"ALSA-2022:2092"},{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-lite-devel","purl":"pkg:rpm/almalinux/bind-lite-devel","source":"ALSA-2022:2092"},{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-pkcs11","purl":"pkg:rpm/almalinux/bind-pkcs11","source":"ALSA-2022:2092"},{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-pkcs11-devel","purl":"pkg:rpm/almalinux/bind-pkcs11-devel","source":"ALSA-2022:2092"},{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-pkcs11-libs","purl":"pkg:rpm/almalinux/bind-pkcs11-libs","source":"ALSA-2022:2092"},{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-pkcs11-utils","purl":"pkg:rpm/almalinux/bind-pkcs11-utils","source":"ALSA-2022:2092"},{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-sdb","purl":"pkg:rpm/almalinux/bind-sdb","source":"ALSA-2022:2092"},{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-sdb-chroot","purl":"pkg:rpm/almalinux/bind-sdb-chroot","source":"ALSA-2022:2092"},{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-utils","purl":"pkg:rpm/almalinux/bind-utils","source":"ALSA-2022:2092"},{"ecosystem":"AlmaLinux:8","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"python3-bind","purl":"pkg:rpm/almalinux/python3-bind","source":"ALSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind","purl":"pkg:rpm/redhat/bind","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-chroot","purl":"pkg:rpm/redhat/bind-chroot","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-debuginfo","purl":"pkg:rpm/redhat/bind-debuginfo","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-debugsource","purl":"pkg:rpm/redhat/bind-debugsource","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-devel","purl":"pkg:rpm/redhat/bind-devel","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-export-libs-debuginfo","purl":"pkg:rpm/redhat/bind-export-libs-debuginfo","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-libs","purl":"pkg:rpm/redhat/bind-libs","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-libs-debuginfo","purl":"pkg:rpm/redhat/bind-libs-debuginfo","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-libs-lite","purl":"pkg:rpm/redhat/bind-libs-lite","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-libs-lite-debuginfo","purl":"pkg:rpm/redhat/bind-libs-lite-debuginfo","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-license","purl":"pkg:rpm/redhat/bind-license","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-lite-devel","purl":"pkg:rpm/redhat/bind-lite-devel","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-pkcs11","purl":"pkg:rpm/redhat/bind-pkcs11","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-pkcs11-debuginfo","purl":"pkg:rpm/redhat/bind-pkcs11-debuginfo","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-pkcs11-devel","purl":"pkg:rpm/redhat/bind-pkcs11-devel","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-pkcs11-libs","purl":"pkg:rpm/redhat/bind-pkcs11-libs","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-pkcs11-libs-debuginfo","purl":"pkg:rpm/redhat/bind-pkcs11-libs-debuginfo","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-pkcs11-utils","purl":"pkg:rpm/redhat/bind-pkcs11-utils","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-pkcs11-utils-debuginfo","purl":"pkg:rpm/redhat/bind-pkcs11-utils-debuginfo","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-sdb","purl":"pkg:rpm/redhat/bind-sdb","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-sdb-chroot","purl":"pkg:rpm/redhat/bind-sdb-chroot","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-sdb-debuginfo","purl":"pkg:rpm/redhat/bind-sdb-debuginfo","source":"RHSA-2022:2092"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["32:9.11.36-3.el8"],"introduced":["0"],"last_affected":[],"package":"bind-utils","purl":"pkg:rpm/redhat/bind-utils","source":"RHSA-2022:2092"}],"prev":{"headline":"Denial of service in BIND9","id":"CVE-2021-25218"},"products":["BIND9"],"published":"2021-10-27","related":[{"cvss_score":10,"headline":"ProFTPD Improper Access 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":"MIT","name":"AlmaLinux","prefix":"ALSA"},{"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":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-09-16","vendors":["ISC"]},"summary":"Attackers can degrade BIND resolver performance by exploiting a flaw in lame cache data structures, causing significant delays in client query processing.","url":"https://insights.sbomify.com/CVE-2021-25219/"}