{"answers":{"affected":"It affects 8 products.","exploited":"Yes. Attackers have exploited CVE-2021-31955 in the wild since at least 3 Nov 2021.","fix":"No fix has been published for CVE-2021-31955 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Nov 2021.","what":"CVE-2021-31955 is a medium-severity vulnerability in Microsoft Windows 10 1809, published on 8 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-31955 and fix it if it is affected.\n\nWhat it is: CVE-2021-31955 is a medium-severity vulnerability in Microsoft Windows 10 1809, published on 8 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: Yes. Attackers have exploited CVE-2021-31955 in the wild since at least 3 Nov 2021.\n\nAffected product: Microsoft Windows 10 1809. 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-2021-31955/ (Markdown: https://insights.sbomify.com/CVE-2021-31955/index.md)","id":"CVE-2021-31955","markdown":"https://insights.sbomify.com/CVE-2021-31955/index.md","name":"CVE-2021-31955","record":{"aliases":["GHSA-4grg-84cr-6c2h"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["data_read"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Windows Kernel","requires_auth":"low_privilege","summary":"An attacker can exploit a flaw in the Windows Kernel to disclose sensitive information, potentially aiding further attacks.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"microsoft","cpe":[{"product":"windows_10_1809","vendor":"microsoft"},{"product":"windows_10_1909","vendor":"microsoft"},{"product":"windows_10_2004","vendor":"microsoft"},{"product":"windows_10_20h2","vendor":"microsoft"},{"product":"windows_10_21h1","vendor":"microsoft"},{"product":"windows_server_2004","vendor":"microsoft"},{"product":"windows_server_2019","vendor":"microsoft"},{"product":"windows_server_20h2","vendor":"microsoft"}],"cvss":{"score":5.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C","version":"3.1"},"cwes":[{"id":"CWE-497","name":"Exposure of Sensitive System Information to an Unauthorized Control Sphere"}],"description":"Windows Kernel Information Disclosure Vulnerability","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2021-06-26","github_poc":2,"max_poc_stars":12,"metasploit":0,"nuclei":0,"refs":[{"date":"2021-06-26T03:59:38Z","kind":"github_poc","ref":"https://github.com/freeide/CVE-2021-31955-POC","stars":12,"title":null},{"date":"2025-10-29T18:16:29Z","kind":"github_poc","ref":"https://github.com/ApexPredator-InfoSec/forti_shield","stars":2,"title":"A combined POC for CVE-2021-31955,  CVE-2015-4077, and CVE-2015-5736"}],"tier":"exploited"},"has_fix":null,"headline":"Microsoft Windows Kernel Information Disclosure","id":"CVE-2021-31955","indexable":true,"kev":{"dateAdded":"2021-11-03","dueDate":"2021-11-17","knownRansomwareCampaignUse":"Unknown","product":"Windows","requiredAction":"Apply updates per vendor instructions.","vendorProject":"Microsoft","vulnerabilityName":"Microsoft Windows Kernel Information Disclosure Vulnerability"},"kind":"cve","links":{"ecosystem":null,"product":"microsoft:windows_10_1809","products":["microsoft:windows_10_1809","microsoft:windows_10_20h2","microsoft:windows_10_21h1","microsoft:windows_server_2019","microsoft:windows_server_20h2"],"type":"information_disclosure","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Microsoft Windows NTFS Privilege Escalation","id":"CVE-2021-31956"},"packages":[],"prev":{"headline":"Windows Common Log File System Driver Elevation of Privilege Vulnerability","id":"CVE-2021-31954"},"products":["Windows 10 Version 1809","Windows 10 Version 1909","Windows 10 Version 2004","Windows 10 Version 20H2","Windows 10 Version 21H1","Windows Server 2019","Windows Server 2019 (Server Core installation)","Windows Server version 2004","Windows Server version 20H2"],"published":"2021-06-08","related":[{"cvss_score":8.8,"headline":"Microsoft SmartScreen Prompt Security Feature Bypass","id":"CVE-2024-29988","kev_date_added":"2024-04-30","published":"2024-04-09"},{"cvss_score":8.1,"headline":"Microsoft Windows Internet Shortcut Files Security Feature Bypass","id":"CVE-2024-21412","kev_date_added":"2024-02-13","published":"2024-02-13"},{"cvss_score":7.8,"headline":"Microsoft Windows Use After Free","id":"CVE-2025-62221","kev_date_added":"2025-12-09","published":"2025-12-09"},{"cvss_score":7.8,"headline":"Microsoft Windows DWM Core Library Use-After-Free","id":"CVE-2025-30400","kev_date_added":"2025-05-13","published":"2025-05-13"},{"cvss_score":7.8,"headline":"Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control","id":"CVE-2024-21338","kev_date_added":"2024-03-04","published":"2024-02-13"},{"cvss_score":7.8,"headline":"Microsoft Windows Desktop Window Manager (DWM) Core Library Privilege Escalation","id":"CVE-2023-36033","kev_date_added":"2023-11-14","published":"2023-11-14"},{"cvss_score":7.8,"headline":"Microsoft Streaming Service Proxy Privilege Escalation","id":"CVE-2023-36802","kev_date_added":"2023-09-12","published":"2023-09-12"}],"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":"open","licence":"CC0 1.0","name":"CISA KEV"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"active","technical_impact":"partial"},"state":"PUBLISHED","updated":"2025-10-21","vendors":["Microsoft"]},"summary":"An attacker can exploit a flaw in the Windows Kernel to disclose sensitive information, potentially aiding further attacks.","url":"https://insights.sbomify.com/CVE-2021-31955/"}