CVE-2021-20225

A flaw was found in grub2 in versions prior to 2.06. The option parser allows an attacker to write past the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

• CWE-787
• CWE-787

• https://bugzilla.redhat.com/show_bug.cgi?id=1924696Issue Tracking, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
• https://security.gentoo.org/glsa/202104-05Third Party Advisory
• https://security.netapp.com/advisory/ntap-20220325-0001/Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1924696Issue Tracking, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
• https://security.gentoo.org/glsa/202104-05Third Party Advisory
• https://security.netapp.com/advisory/ntap-20220325-0001/Third Party Advisory

Published

Mar 3, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2021-2022Vulnerability in the MySQL Server product of Oracle MySQL (c…4.4
• CVE-2021-20220A flaw was found in Undertow. A regression in the fix for CV…4.8
• CVE-2021-20221An out-of-bounds heap buffer access issue was found in the A…6
• CVE-2021-20222A flaw was found in keycloak. The new account console in key…7.5
• CVE-2021-20223Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultID…
• CVE-2021-20224An integer overflow issue was discovered in ImageMagick's Ex…5.5
• CVE-2021-20226A use-after-free flaw was found in the io_uring in Linux ker…7.8
• CVE-2021-20227A flaw was found in SQLite's SELECT query functionality (src…5.5
• CVE-2021-20228A flaw was found in the Ansible Engine 2.9.18, where sensiti…7.5
• CVE-2021-20229A flaw was found in PostgreSQL in versions before 13.2. This…4.3
• CVE-2021-2023Vulnerability in the Oracle Installed Base product of Oracle…4.7
• CVE-2021-20230A flaw was found in stunnel before 5.57, where it improperly…7.5