{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-24040 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2021-24040 is a critical unsafe deserialization vulnerability in Facebook ParlAI, published on 10 Sep 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-2021-24040 and fix it if it is affected.\n\nWhat it is: CVE-2021-24040 is a critical unsafe deserialization vulnerability in Facebook ParlAI, published on 10 Sep 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-2021-24040 in the wild and no public exploit code.\n\nAffected product: Facebook ParlAI. 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-2021-24040/ (Markdown: https://insights.sbomify.com/CVE-2021-24040/index.md)","id":"CVE-2021-24040","markdown":"https://insights.sbomify.com/CVE-2021-24040/index.md","name":"CVE-2021-24040","record":{"aliases":[],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"ParlAI library","requires_auth":"none","summary":"An attacker with local file write access can achieve remote code execution via unsafe YAML deserialization in the ParlAI library.","user_interaction":"not_required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"facebook","cpe":[{"product":"parlai","vendor":"facebook"}],"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-502","name":"Deserialization of Untrusted Data"}],"description":"Due to use of unsafe YAML deserialization logic, an attacker with the ability to modify local YAML configuration files could provide malicious input, resulting in remote code execution or similar risks. This issue affects ParlAI prior to v1.1.0.","ecosystems":[],"exploits":{"exploitdb":1,"first_seen":"2021-09-13","github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[{"date":"2021-09-13","kind":"exploitdb","ref":"50289","stars":null,"title":"Facebook ParlAI 1.0.0 -  Deserialization of Untrusted Data in parlai"}],"tier":"poc_unverified"},"has_fix":true,"headline":"Deserialization in ParlAI","id":"CVE-2021-24040","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"deserialization","year":"2021"},"n_packages":0,"n_references":3,"next":{"headline":"Memory corruption in WhatsApp Business for Android","id":"CVE-2021-24041"},"packages":[],"prev":{"headline":"Privilege escalation in Oculus Desktop","id":"CVE-2021-24038"},"products":["ParlAI"],"published":"2021-09-10","related":[{"cvss_score":8.4,"headline":"Deserialization of Untrusted Data in parlai","id":"CVE-2021-39207","kev_date_added":null,"published":"2021-09-10"}],"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)"},{"class":"attribution","licence":"GPL-2.0-or-later","name":"Exploit-DB"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["Facebook"]},"summary":"An attacker with local file write access can achieve remote code execution via unsafe YAML deserialization in the ParlAI library.","url":"https://insights.sbomify.com/CVE-2021-24040/"}