{"answers":{"affected":"It affects 6 products.","exploited":"There is no known exploitation of CVE-2021-44538 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2021-44538 is a critical memory corruption vulnerability in Debian Debian Linux, published on 14 Dec 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-2021-44538 and fix it if it is affected.\n\nWhat it is: CVE-2021-44538 is a critical memory corruption vulnerability in Debian Debian Linux, published on 14 Dec 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-2021-44538 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-2021-44538/ (Markdown: https://insights.sbomify.com/CVE-2021-44538/index.md)","id":"CVE-2021-44538","markdown":"https://insights.sbomify.com/CVE-2021-44538/index.md","name":"CVE-2021-44538","record":{"aliases":["DEBIAN-CVE-2021-44538","GHSA-q7f4-j236-f4hc","MGASA-2021-0571","UBUNTU-CVE-2021-44538"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Matrix libolm library","requires_auth":"none","summary":"A buffer overflow in libolm allows remote attackers to potentially execute code or cause denial of service via crafted messages.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"cinny","vendor":"cinny_project"},{"product":"debian_linux","vendor":"debian"},{"product":"element","vendor":"matrix"},{"product":"javascript_sdk","vendor":"matrix"},{"product":"olm","vendor":"matrix"},{"product":"schildichat","vendor":"schildi"}],"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-119","name":"Improper Restriction of Operations within the Bounds of a Memory Buffer"}],"description":"The olm_session_describe function in Matrix libolm before 3.2.7 is vulnerable to a buffer overflow. The Olm session object represents a cryptographic channel between two parties. Therefore, its state is partially controllable by the remote party of the channel. Attackers can construct a crafted sequence of messages to manipulate the state of the receiver's session in such a way that, for some buffer sizes, a buffer overflow happens on a call to olm_session_describe. Furthermore, safe buffer sizes were undocumented. The overflow content is partially controllable by the attacker and limited to ASCII spaces and digits. The known affected products are Element Web And SchildiChat Web.","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-2021-44538","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"debian:debian_linux","products":["debian:debian_linux"],"type":"memory_corruption","year":"2021"},"n_packages":0,"n_references":4,"next":{"headline":"Denial of service in Privoxy","id":"CVE-2021-44540"},"packages":[],"prev":{"headline":"Code injection in n/a","id":"CVE-2021-44537"},"products":["n/a"],"published":"2021-12-14","related":[],"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 buffer overflow in libolm allows remote attackers to potentially execute code or cause denial of service via crafted messages.","url":"https://insights.sbomify.com/CVE-2021-44538/"}