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Vulnerability · Published Nov 22, 2021 · Assigned by mitre

CVE-2021-44143

Critical 9.8

In plain English

A critical-severity security flaw in the isync package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.8% (higher than 90% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)3.8%top 10.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20isync1.4.4-r0ALPINE-CVE-2021-44143
Alpine:v3.21isync1.4.4-r0ALPINE-CVE-2021-44143
Alpine:v3.22isync1.4.4-r0ALPINE-CVE-2021-44143
Alpine:v3.23isync1.4.4-r0ALPINE-CVE-2021-44143
Alpine:v3.24isync1.4.4-r0ALPINE-CVE-2021-44143
Debian:12isync1.4.4-1DEBIAN-CVE-2021-44143
Debian:13isync1.4.4-1DEBIAN-CVE-2021-44143
Debian:14isync1.4.4-1DEBIAN-CVE-2021-44143
Ubuntu:22.04:LTSisyncno fix listedUBUNTU-CVE-2021-44143
Ubuntu:24.04:LTSisyncno fix listedUBUNTU-CVE-2021-44143
Ubuntu:25.10isyncno fix listedUBUNTU-CVE-2021-44143
Ubuntu:26.04:LTSisyncno fix listedUBUNTU-CVE-2021-44143
Ubuntu:26.10isyncno fix listedUBUNTU-CVE-2021-44143

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References