{"answers":{"affected":"6 open source packages ship an affected version, including io.netty:netty, io.netty:netty-codec and org.jboss.netty:netty. It affects 19 products.","exploited":"There is no known exploitation of CVE-2021-37136 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2021-37136 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 19 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-2021-37136 and fix it if it is affected.\n\nWhat it is: CVE-2021-37136 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 19 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-2021-37136 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- io.netty:netty (Maven): affected all versions; no fix listed\n- io.netty:netty (Maven): affected all versions; no fix listed\n- io.netty:netty-codec (Maven): affected all versions; fixed in 4.1.68.Final\n- io.netty:netty-codec (Maven): affected all versions; fixed in 4.1.68.Final\n- org.jboss.netty:netty (Maven): affected all versions; no fix listed\n- org.jboss.netty:netty (Maven): 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/CVE-2021-37136/ (Markdown: https://insights.sbomify.com/CVE-2021-37136/index.md)","id":"CVE-2021-37136","markdown":"https://insights.sbomify.com/CVE-2021-37136/index.md","name":"CVE-2021-37136","record":{"aliases":["CLEANSTART-2026-AS77854","CLEANSTART-2026-MT03413","CLSA-2025-1756771562","DEBIAN-CVE-2021-37136","GHSA-grg4-wf29-r9vv","MINI-364f-wpwc-r47v","MINI-5q59-5hmv-w53g","UBUNTU-CVE-2021-37136"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Netty Java library","requires_auth":"none","summary":"Attackers can cause a denial of service via OutOfMemoryError in Netty's Bzip2 decoder by providing malicious input without size restrictions.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"JFROG","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"oncommand_insight","vendor":"netapp"},{"product":"netty","vendor":"netty"},{"product":"banking_apis","vendor":"oracle"},{"product":"banking_digital_experience","vendor":"oracle"},{"product":"coherence","vendor":"oracle"},{"product":"commerce_guided_search","vendor":"oracle"},{"product":"communications_brm_-_elastic_charging_engine","vendor":"oracle"},{"product":"communications_cloud_native_core_binding_support_function","vendor":"oracle"},{"product":"communications_cloud_native_core_network_slice_selection_function","vendor":"oracle"},{"product":"communications_cloud_native_core_policy","vendor":"oracle"},{"product":"communications_cloud_native_core_security_edge_protection_proxy","vendor":"oracle"},{"product":"communications_cloud_native_core_unified_data_repository","vendor":"oracle"},{"product":"communications_diameter_signaling_router","vendor":"oracle"},{"product":"communications_instant_messaging_server","vendor":"oracle"},{"product":"helidon","vendor":"oracle"},{"product":"peoplesoft_enterprise_peopletools","vendor":"oracle"},{"product":"webcenter_portal","vendor":"oracle"},{"product":"quarkus","vendor":"quarkus"}],"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":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"The Bzip2 decompression decoder function doesn't allow setting size restrictions on the decompressed output data (which affects the allocation size used during decompression). All users of Bzip2Decoder are affected. The malicious input can trigger an OOME and so a DoS attack","ecosystems":["Maven"],"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":"Bzip2Decoder doesn't allow setting size restrictions for decompressed data","id":"CVE-2021-37136","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":"debian:debian_linux","products":["debian:debian_linux","netapp:oncommand_insight","netty:netty","oracle:coherence","oracle:commerce_guided_search","oracle:communications_cloud_native_core_binding_support_function","oracle:communications_cloud_native_core_policy","oracle:communications_diameter_signaling_router","oracle:communications_instant_messaging_server","oracle:helidon","oracle:peoplesoft_enterprise_peopletools","oracle:webcenter_portal"],"type":"denial_of_service","year":"2021"},"n_packages":6,"n_references":13,"next":{"headline":"SnappyFrameDecoder doesn't restrict chunk length any may buffer skippable chunks in an unnecessary way","id":"CVE-2021-37137"},"packages":[{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":[],"package":"io.netty:netty","purl":null,"source":"GHSA-grg4-wf29-r9vv"},{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":[],"package":"io.netty:netty","purl":"pkg:maven/io.netty/netty","source":"GHSA-grg4-wf29-r9vv"},{"ecosystem":"Maven","fixed":["4.1.68.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-codec","purl":null,"source":"GHSA-grg4-wf29-r9vv"},{"ecosystem":"Maven","fixed":["4.1.68.Final"],"introduced":["0"],"last_affected":[],"package":"io.netty:netty-codec","purl":"pkg:maven/io.netty/netty-codec","source":"GHSA-grg4-wf29-r9vv"},{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":[],"package":"org.jboss.netty:netty","purl":null,"source":"GHSA-grg4-wf29-r9vv"},{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":[],"package":"org.jboss.netty:netty","purl":"pkg:maven/org.jboss.netty/netty","source":"GHSA-grg4-wf29-r9vv"}],"prev":{"headline":"Race condition in HarmonyOS","id":"CVE-2021-37134"},"products":["Netty"],"published":"2021-10-19","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":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-08","vendors":["The Netty project"]},"summary":"Attackers can cause a denial of service via OutOfMemoryError in Netty's Bzip2 decoder by providing malicious input without size restrictions.","url":"https://insights.sbomify.com/CVE-2021-37136/"}