{"answers":{"affected":"It affects 8 products.","exploited":"There is no known exploitation of CVE-2020-36478 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2020-36478 is a high-severity vulnerability in Arm Mbed Tls, published on 23 Aug 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-2020-36478 and fix it if it is affected.\n\nWhat it is: CVE-2020-36478 is a high-severity vulnerability in Arm Mbed Tls, published on 23 Aug 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-2020-36478 in the wild and no public exploit code.\n\nAffected product: Arm Mbed Tls. 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-2020-36478/ (Markdown: https://insights.sbomify.com/CVE-2020-36478/index.md)","id":"CVE-2020-36478","markdown":"https://insights.sbomify.com/CVE-2020-36478/index.md","name":"CVE-2020-36478","record":{"aliases":["DEBIAN-CVE-2020-36478","GHSA-8xrj-2854-7x44","JLSEC-2025-213","UBUNTU-CVE-2020-36478"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Mbed TLS library","requires_auth":"none","summary":"Attackers can bypass certificate validation in Mbed TLS by exploiting NULL algorithm parameter handling, allowing invalid certificates to be accepted.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"mbed_tls","vendor":"arm"},{"product":"debian_linux","vendor":"debian"},{"product":"logo\\!_cmr2020_firmware","vendor":"siemens"},{"product":"logo\\!_cmr2040_firmware","vendor":"siemens"},{"product":"simatic_rtu3000c_firmware","vendor":"siemens"},{"product":"simatic_rtu3030c_firmware","vendor":"siemens"},{"product":"simatic_rtu3031c_firmware","vendor":"siemens"},{"product":"simatic_rtu3041c_firmware","vendor":"siemens"}],"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:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-295","name":"Improper Certificate Validation"}],"description":"An issue was discovered in Mbed TLS before 2.25.0 (and before 2.16.9 LTS and before 2.7.18 LTS). A NULL algorithm parameters entry looks identical to an array of REAL (size zero) and thus the certificate is considered valid. However, if the parameters do not match in any way, then the certificate should be considered invalid.","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":"Security feature bypass in n/a","id":"CVE-2020-36478","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"arm:mbed_tls","products":["arm:mbed_tls","debian:debian_linux"],"type":"security_feature_bypass","year":"2020"},"n_packages":0,"n_references":7,"next":{"headline":"File upload in n/a","id":"CVE-2020-36485"},"packages":[],"prev":{"headline":"Security feature bypass in n/a","id":"CVE-2020-36477"},"products":["n/a"],"published":"2021-08-23","related":[{"cvss_score":9.8,"headline":"Deserialization in n/a","id":"CVE-2026-34877","kev_date_added":null,"published":"2026-04-02"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2022-46393","kev_date_added":null,"published":"2022-12-15"},{"cvss_score":9.8,"headline":"Use after free in n/a","id":"CVE-2021-44732","kev_date_added":null,"published":"2021-12-20"},{"cvss_score":9.8,"headline":"Integer overflow in n/a","id":"CVE-2017-18187","kev_date_added":null,"published":"2018-02-14"},{"cvss_score":9.8,"headline":"Memory corruption in ARM mbed TLS before 1.3.22, before 2.1.10, and before 2.7.0","id":"CVE-2018-0487","kev_date_added":null,"published":"2018-02-13"},{"cvss_score":9.8,"headline":"Memory corruption in ARM mbed TLS before 1.3.22, before 2.1.10, and before 2.7.0","id":"CVE-2018-0488","kev_date_added":null,"published":"2018-02-13"},{"cvss_score":9.1,"headline":"Weak cryptography in n/a","id":"CVE-2026-34872","kev_date_added":null,"published":"2026-04-01"}],"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":"Attackers can bypass certificate validation in Mbed TLS by exploiting NULL algorithm parameter handling, allowing invalid certificates to be accepted.","url":"https://insights.sbomify.com/CVE-2020-36478/"}