{"id":"CVE-2021-28693","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-28693","generatedAt":"2026-10-27T20:19:40.155Z","title":"To ensure sensitive data is not leaked from the modules, Xen must \"scrub\" them before handing the page over to the allocator.","description":"xen/arm: Boot modules are not scrubbed The bootloader will load boot modules (e.g. kernel, initramfs...) in a temporary area before they are copied by Xen to each domain memory. To ensure sensitive data is not leaked from the modules, Xen must \"scrub\" them before handing the page over to the allocator. Unfortunately, it was discovered that modules will not be scrubbed on Arm.","published":"2021-06-30T11:15:08.000Z","lastModified":"2026-06-17T03:46:49.000Z","status":"Modified","sourceIdentifier":"security@xen.org","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"},"cwe":[],"affected":["xen/xen"],"epss":{"score":0.00321,"percentile":0.2494,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.32%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://security.gentoo.org/glsa/202107-30","tags":["Third Party Advisory"],"source":"security@xen.org"},{"url":"https://xenbits.xenproject.org/xsa/advisory-372.txt","tags":["Vendor Advisory"],"source":"security@xen.org"},{"url":"https://security.gentoo.org/glsa/202107-30","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://xenbits.xenproject.org/xsa/advisory-372.txt","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-28693","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}