{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-34813 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2021-34813 is a critical memory corruption vulnerability in n/a, published on 16 Jun 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-2021-34813 and fix it if it is affected.\n\nWhat it is: CVE-2021-34813 is a critical memory corruption vulnerability in n/a, published on 16 Jun 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-2021-34813 in the wild and no public exploit code.\n\nAffected product: n/a. 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-2021-34813/ (Markdown: https://insights.sbomify.com/CVE-2021-34813/index.md)","id":"CVE-2021-34813","markdown":"https://insights.sbomify.com/CVE-2021-34813/index.md","name":"CVE-2021-34813","record":{"aliases":["DEBIAN-CVE-2021-34813","GHSA-269w-9hm6-g22q","UBUNTU-CVE-2021-34813","USN-5194-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service","code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Matrix Olm library","requires_auth":"none","summary":"A malicious Matrix homeserver can crash clients via a stack-based buffer overflow in libolm, potentially enabling remote code execution in nonstandard builds.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"olm","vendor":"matrix"}],"cvss":{"score":9.8,"severity":"critical","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"}],"description":"Matrix libolm before 3.2.3 allows a malicious Matrix homeserver to crash a client (while it is attempting to retrieve an Olm encrypted room key backup from the homeserver) because olm_pk_decrypt has a stack-based buffer overflow. Remote code execution might be possible for some nonstandard build configurations.","ecosystems":[],"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":"Memory corruption in n/a","id":"CVE-2021-34813","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2021"},"n_packages":0,"n_references":3,"next":{"headline":"Security feature bypass in n/a","id":"CVE-2021-34814"},"packages":[],"prev":{"headline":"Hardcoded credentials in Synology Calendar","id":"CVE-2021-34812"},"products":["n/a"],"published":"2021-06-16","related":[{"cvss_score":5.3,"headline":"Information disclosure in n/a","id":"CVE-2024-45191","kev_date_added":null,"published":"2024-08-22"},{"cvss_score":5.3,"headline":"Information disclosure in n/a","id":"CVE-2024-45192","kev_date_added":null,"published":"2024-08-22"},{"cvss_score":4.3,"headline":"Weak cryptography in n/a","id":"CVE-2024-45193","kev_date_added":null,"published":"2024-08-22"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2024-08-04","vendors":["n/a"]},"summary":"A malicious Matrix homeserver can crash clients via a stack-based buffer overflow in libolm, potentially enabling remote code execution in nonstandard builds.","url":"https://insights.sbomify.com/CVE-2021-34813/"}