{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-37124 exists.","fix":"No fix has been published for CVE-2020-37124 yet. Limit exposure of the affected software until one is available.","what":"CVE-2020-37124 is a high-severity memory corruption vulnerability in 4Mhz B64dec, published on 5 Feb 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2020-37124 and fix it if it is affected.\n\nWhat it is: CVE-2020-37124 is a high-severity memory corruption vulnerability in 4Mhz B64dec, published on 5 Feb 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-37124 exists.\n\nAffected product: 4Mhz B64dec. 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-2020-37124/ (Markdown: https://insights.sbomify.com/CVE-2020-37124/index.md)","id":"CVE-2020-37124","markdown":"https://insights.sbomify.com/CVE-2020-37124/index.md","name":"CVE-2020-37124","record":{"aliases":["GHSA-vh82-45mm-g28j"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Base64 decoding library","requires_auth":"none","summary":"Attackers can execute arbitrary code via a buffer overflow in the B64dec library during base64 decoding using SEH overwrite techniques.","user_interaction":"required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.4,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-121","name":"Stack-based Buffer Overflow"}],"description":"B64dec 1.1.2 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting Structured Exception Handler (SEH) with crafted input. Attackers can leverage an egg hunter technique and carefully constructed payload to inject and execute malicious code during base64 decoding process.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":null,"headline":"B64dec 1.1.2 - Buffer Overflow (SEH Overflow + Egg Hunter)","id":"CVE-2020-37124","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2020"},"n_packages":0,"n_references":3,"next":{"headline":"Edimax Technology EW-7438RPn-v3 Mini 1.27 - Remote Code Execution","id":"CVE-2020-37125"},"packages":[],"prev":{"headline":"Pinger 1.0 - Remote Code Execution","id":"CVE-2020-37123"},"products":["B64dec"],"published":"2026-02-05","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-02-06","vendors":["4Mhz"]},"summary":"Attackers can execute arbitrary code via a buffer overflow in the B64dec library during base64 decoding using SEH overwrite techniques.","url":"https://insights.sbomify.com/CVE-2020-37124/"}