CVE-2021-3578

A flaw was found in mbsync before v1.3.6 and v1.4.2, where an unchecked pointer cast allows a malicious or compromised server to write an arbitrary integer value past the end of a heap-allocated structure by issuing an unexpected APPENDUID response. This could be plausibly exploited for remote code execution on the client.

• CWE-704
• CWE-704

• http://www.openwall.com/lists/oss-security/2021/06/07/1Mailing List, Patch, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1961710Not Applicable
• https://bugzilla.redhat.com/show_bug.cgi?id=1967397Issue Tracking, Patch, Third Party Advisory
• https://github.blog/2021-06-10-privilege-escalation-polkit-root-on-linux-with-bug/Not Applicable
• https://lists.debian.org/debian-lts-announce/2022/07/msg00001.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RPIDLIJKNRJHUVBCL7QGAPAAVPIHQGXK/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U75UFEWRAZYKVL5NHMPBUOLWN3WXTOEI/
• https://security.gentoo.org/glsa/202208-15Third Party Advisory
• https://www.openwall.com/lists/oss-security/2021/06/07/1Mailing List, Patch, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/06/07/1Mailing List, Patch, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1961710Not Applicable
• https://bugzilla.redhat.com/show_bug.cgi?id=1967397Issue Tracking, Patch, Third Party Advisory
• https://github.blog/2021-06-10-privilege-escalation-polkit-root-on-linux-with-bug/Not Applicable
• https://lists.debian.org/debian-lts-announce/2022/07/msg00001.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RPIDLIJKNRJHUVBCL7QGAPAAVPIHQGXK/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U75UFEWRAZYKVL5NHMPBUOLWN3WXTOEI/
• https://security.gentoo.org/glsa/202208-15Third Party Advisory
• https://www.openwall.com/lists/oss-security/2021/06/07/1Mailing List, Patch, Third Party Advisory

Published

Feb 16, 2022

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.
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