{"answers":{"affected":"It affects 5 products.","exploited":"There is no known exploitation of CVE-2021-4209 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-4209 is a medium-severity vulnerability in Gnu Gnutls, published on 24 Aug 2022. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-4209 and fix it if it is affected.\n\nWhat it is: CVE-2021-4209 is a medium-severity vulnerability in Gnu Gnutls, published on 24 Aug 2022. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-4209 in the wild and no public exploit code.\n\nAffected product: Gnu Gnutls. 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-2021-4209/ (Markdown: https://insights.sbomify.com/CVE-2021-4209/index.md)","id":"CVE-2021-4209","markdown":"https://insights.sbomify.com/CVE-2021-4209/index.md","name":"CVE-2021-4209","record":{"aliases":["DEBIAN-CVE-2021-4209","GHSA-xj78-h3gx-cm6v","JLSEC-2026-522","MGASA-2022-0098","OESA-2022-1889","SUSE-SU-2022:0677-1","SUSE-SU-2022:0678-1","SUSE-SU-2022:0717-1","UBUNTU-CVE-2021-4209","USN-5750-1","openSUSE-SU-2022:0717-1"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"GnuTLS library","requires_auth":"low_privilege","summary":"An authenticated attacker can cause a denial of service in GnuTLS by providing zero-length input to hash update functions.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"gnutls","vendor":"gnu"},{"product":"active_iq_unified_manager","vendor":"netapp"},{"product":"hci_bootstrap_os","vendor":"netapp"},{"product":"solidfire_\\\u0026_hci_management_node","vendor":"netapp"},{"product":"enterprise_linux","vendor":"redhat"}],"cvss":{"score":6.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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 GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances.","ecosystems":["SUSE:Linux Enterprise Micro 5.0","SUSE:Linux Enterprise Micro 5.1","SUSE:Linux Enterprise Module for Basesystem 15 SP3","SUSE:Linux Enterprise Real Time 15 SP2","SUSE:Linux Enterprise Server 12 SP5","SUSE:Linux Enterprise Server for SAP Applications 12 SP5","SUSE:Linux Enterprise Software Development Kit 12 SP5","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 GnuTLS","id":"CVE-2021-4209","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"gnu:gnutls","products":["gnu:gnutls","netapp:active_iq_unified_manager","netapp:solidfire_\\\u0026_hci_management_node","redhat:enterprise_linux"],"type":"null_dereference","year":"2021"},"n_packages":10,"n_references":6,"next":{"headline":"Code injection in BIOS","id":"CVE-2021-4210"},"packages":[{"ecosystem":"SUSE:Linux Enterprise Micro 5.0","fixed":["3.6.7-14.16.1"],"introduced":["0"],"last_affected":[],"package":"gnutls","purl":"pkg:rpm/suse/gnutls\u0026distro=SUSE%20Linux%20Enterprise%20Micro%205.0","source":"SUSE-SU-2022:0717-1"},{"ecosystem":"SUSE:Linux Enterprise Micro 5.1","fixed":["3.6.7-14.16.1"],"introduced":["0"],"last_affected":[],"package":"gnutls","purl":"pkg:rpm/suse/gnutls\u0026distro=SUSE%20Linux%20Enterprise%20Micro%205.1","source":"SUSE-SU-2022:0717-1"},{"ecosystem":"SUSE:Linux Enterprise Module for Basesystem 15 SP3","fixed":["3.6.7-14.16.1"],"introduced":["0"],"last_affected":[],"package":"gnutls","purl":"pkg:rpm/suse/gnutls\u0026distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3","source":"SUSE-SU-2022:0717-1"},{"ecosystem":"SUSE:Linux Enterprise Real Time 15 SP2","fixed":["3.6.7-14.16.1"],"introduced":["0"],"last_affected":[],"package":"gnutls","purl":"pkg:rpm/suse/gnutls\u0026distro=SUSE%20Linux%20Enterprise%20Real%20Time%2015%20SP2","source":"SUSE-SU-2022:0717-1"},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP5","fixed":["3.3.27-3.6.1"],"introduced":["0"],"last_affected":[],"package":"gnutls","purl":"pkg:rpm/suse/gnutls\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5","source":"SUSE-SU-2022:0677-1"},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP5","fixed":["3.4.17-8.11.1"],"introduced":["0"],"last_affected":[],"package":"gnutls","purl":"pkg:rpm/suse/gnutls\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5","source":"SUSE-SU-2022:0678-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 SP5","fixed":["3.3.27-3.6.1"],"introduced":["0"],"last_affected":[],"package":"gnutls","purl":"pkg:rpm/suse/gnutls\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5","source":"SUSE-SU-2022:0677-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 SP5","fixed":["3.4.17-8.11.1"],"introduced":["0"],"last_affected":[],"package":"gnutls","purl":"pkg:rpm/suse/gnutls\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5","source":"SUSE-SU-2022:0678-1"},{"ecosystem":"SUSE:Linux Enterprise Software Development Kit 12 SP5","fixed":["3.3.27-3.6.1"],"introduced":["0"],"last_affected":[],"package":"gnutls","purl":"pkg:rpm/suse/gnutls\u0026distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5","source":"SUSE-SU-2022:0677-1"},{"ecosystem":"openSUSE:Leap 15.3","fixed":["3.6.7-14.16.1"],"introduced":["0"],"last_affected":[],"package":"gnutls","purl":"pkg:rpm/opensuse/gnutls\u0026distro=openSUSE%20Leap%2015.3","source":"openSUSE-SU-2022:0717-1"}],"prev":{"headline":"ExportFeed \u003c= 2.0.1.0 - Admin+ SQL Injection","id":"CVE-2021-4208"},"products":["GnuTLS"],"published":"2022-08-24","related":[{"cvss_score":10,"headline":"Memory corruption in n/a","id":"CVE-2008-1948","kev_date_added":null,"published":"2008-05-21"},{"cvss_score":9.8,"headline":"Use after free in n/a","id":"CVE-2017-5334","kev_date_added":null,"published":"2017-03-24"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2017-5336","kev_date_added":null,"published":"2017-03-24"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2017-5337","kev_date_added":null,"published":"2017-03-24"},{"cvss_score":9.3,"headline":"Null dereference in n/a","id":"CVE-2008-1949","kev_date_added":null,"published":"2008-05-21"},{"cvss_score":7.8,"headline":"Denial of service in n/a","id":"CVE-2004-2531","kev_date_added":null,"published":"2005-10-25"},{"cvss_score":7.6,"headline":"Use after free in n/a","id":"CVE-2008-2377","kev_date_added":null,"published":"2008-08-08"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"SUSE"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"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":"2026-10-14","vendors":["n/a"]},"summary":"An authenticated attacker can cause a denial of service in GnuTLS by providing zero-length input to hash update functions.","url":"https://insights.sbomify.com/CVE-2021-4209/"}