THREATPORT/VULNERABILITY/CVE-2021-44143
CRITICAL SEVERITY

CVE-2021-44143

Isync vulnerability

CVSS
9.8
EPSS
3.7%
EPSS pct
88th
Exploited
No known
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 vendor
Isync Project
Affected product
Isync
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
Published
2021-11-22

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 3.7% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-2021-44143

  • Confirm whether Isync Project Isync is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-44143.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-44143

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-44143 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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