CVE catalog

CVE-2021-44143

isync: CVE-2021-44143

[CVE catalog]

Severity
Critical · CVSS 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
Source
[NVD] · [CVE record]
EPSS
3.78% · Oct 25, 2026

A flaw was found in mbsync in isync 1.4.0 through 1.4.3. Due to an unchecked condition, a malicious or compromised IMAP server could use a crafted mail message that lacks headers (i.e., one that starts with an empty line) to provoke a heap overflow, which could conceivably be exploited for remote code execution.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debianisyncsid1.5.1-2fixed
Debianisyncforky1.5.1-2fixed
Debianisynctrixie1.5.1-1fixed
Debianisyncbookworm1.4.4-5fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianisyncsourcesid1.4.4-1not yet assignedNot reported[999804]
Debianisyncsourceforky1.4.4-1not yet assignedNot reported[999804]
Debianisyncsourcetrixie1.4.4-1not yet assignedNot reported[999804]
Debianisyncsourcebookworm1.4.4-1not yet assignedNot reported[999804]

[Debian bug #999804]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [isync]Fixed
    Details (2)

    • 1.4.4-5 · amd64 · bookworm

      Fixed · Fixed: 1.4.4-1

      dsa · isync · debian · bookworm; dsa · isync · debian · 12

    • 1.4.4-5 · arm64 · bookworm

      Fixed · Fixed: 1.4.4-1

      dsa · isync · debian · bookworm; dsa · isync · debian · 12

[Debian 13 (Trixie)]

  • [isync]Fixed
    Details (2)

    • 1.5.1-1 · amd64 · trixie

      Fixed · Fixed: 1.4.4-1

      dsa · isync · debian · 13

    • 1.5.1-1 · arm64 · trixie

      Fixed · Fixed: 1.4.4-1

      dsa · isync · debian · 13

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]