{"answers":{"affected":"It affects 3 products.","exploited":"There is no known exploitation of CVE-2021-43255 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-43255 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-43255 is a medium-severity vulnerability in Microsoft 365 Apps, published on 15 Dec 2021. 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-2021-43255 and fix it if it is affected.\n\nWhat it is: CVE-2021-43255 is a medium-severity vulnerability in Microsoft 365 Apps, published on 15 Dec 2021. 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: There is no known exploitation of CVE-2021-43255 in the wild and no public exploit code.\n\nAffected product: Microsoft 365 Apps. 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-2021-43255/ (Markdown: https://insights.sbomify.com/CVE-2021-43255/index.md)","id":"CVE-2021-43255","markdown":"https://insights.sbomify.com/CVE-2021-43255/index.md","name":"CVE-2021-43255","record":{"aliases":["GHSA-x5f4-jxc9-j6mv"],"analysis":{"component_type":"desktop_application","fix_type":"patch","impacts":["security_bypass"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Microsoft Office","requires_auth":"none","summary":"Attackers can spoof the Microsoft Office Trust Center to bypass security warnings, potentially tricking users into opening malicious files.","user_interaction":"required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"microsoft","cpe":[{"product":"365_apps","vendor":"microsoft"},{"product":"office","vendor":"microsoft"},{"product":"office_long_term_servicing_channel","vendor":"microsoft"}],"cvss":{"score":5.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C","version":"3.1"},"cwes":[],"description":"Microsoft Office Trust Center Spoofing Vulnerability","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Microsoft Office Trust Center Spoofing Vulnerability","id":"CVE-2021-43255","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"microsoft:365_apps","products":["microsoft:365_apps","microsoft:office","microsoft:office_long_term_servicing_channel"],"type":"security_feature_bypass","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Microsoft Excel Remote Code Execution Vulnerability","id":"CVE-2021-43256"},"packages":[],"prev":{"headline":"Windows Digital Media Receiver Elevation of Privilege Vulnerability","id":"CVE-2021-43248"},"products":["Microsoft 365 Apps for Enterprise","Microsoft Office 2013 Service Pack 1","Microsoft Office 2016","Microsoft Office 2019","Microsoft Office LTSC 2021"],"published":"2021-12-15","related":[{"cvss_score":9.8,"headline":"Microsoft Outlook Improper Input Validation","id":"CVE-2024-21413","kev_date_added":"2025-02-06","published":"2024-02-13"},{"cvss_score":9.8,"headline":"Microsoft Office Outlook Privilege Escalation","id":"CVE-2023-23397","kev_date_added":"2023-03-14","published":"2023-03-14"},{"cvss_score":8.8,"headline":"Microsoft Project Remote Code Execution Vulnerability","id":"CVE-2024-38189","kev_date_added":"2024-08-13","published":"2024-08-13"},{"cvss_score":8.8,"headline":"Microsoft Outlook Security Feature Bypass","id":"CVE-2023-35311","kev_date_added":"2023-07-11","published":"2023-07-11"},{"cvss_score":7.8,"headline":"Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision","id":"CVE-2026-21514","kev_date_added":"2026-02-10","published":"2026-02-10"},{"cvss_score":7.8,"headline":"Microsoft Office Security Feature Bypass","id":"CVE-2026-21509","kev_date_added":"2026-01-26","published":"2026-01-26"},{"cvss_score":7.8,"headline":"Microsoft Excel Security Feature Bypass","id":"CVE-2021-42292","kev_date_added":"2021-11-17","published":"2021-11-10"}],"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":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2024-08-04","vendors":["Microsoft"]},"summary":"Attackers can spoof the Microsoft Office Trust Center to bypass security warnings, potentially tricking users into opening malicious files.","url":"https://insights.sbomify.com/CVE-2021-43255/"}