CVE-2021-20247
isync - security update
7.4
HIGH
CVSS 3.1
EPSS 1.7%
Description
A flaw was found in mbsync before v1.3.5 and v1.4.1. Validations of the mailbox names returned by IMAP LIST/LSUB do not occur allowing a malicious or compromised server to use specially crafted mailbox names containing '..' path components to access data outside the designated mailbox on the opposite end of the synchronization channel. The highest threat from this vulnerability is to data confidentiality and integrity.
How to fix CVE-2021-20247
To remediate CVE-2021-20247, upgrade the affected package to a fixed version below.
- —upgrade to 1.3.0-2.1 or later
- —upgrade to 1.2.1-2+deb9u1 or later
Is CVE-2021-20247 being exploited?
Low — EPSS is 1.7%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 1.3.0-2.1
- from 0, < 1.2.1-2+deb9u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |