{"cve":"CVE-2021-3578","nvd":{"published":"2022-02-16T19:15:08.507","modified":"2026-06-17T04:05:22.607","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-704"],"references":["http://www.openwall.com/lists/oss-security/2021/06/07/1","https://bugzilla.redhat.com/show_bug.cgi?id=1961710","https://bugzilla.redhat.com/show_bug.cgi?id=1967397","https://github.blog/2021-06-10-privilege-escalation-polkit-root-on-linux-with-bug/","https://lists.debian.org/debian-lts-announce/2022/07/msg00001.html"],"products":["debian:debian_linux","fedoraproject:fedora","isync_project:isync"],"source":"nvd","synced_at":"2026-10-19T21:28:04.509275555+00:00"},"epss":{"cve":"CVE-2021-3578","score":0.01037,"percentile":0.63928,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}