High severity7.4NVD Advisory· Published Feb 23, 2021· Updated Jun 17, 2026
CVE-2021-20247
CVE-2021-20247
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
5- mbsync/mbsyncdescription
- osv-coords3 versionspkg:rpm/opensuse/isync&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/isync&distro=openSUSE%20Tumbleweedpkg:rpm/suse/isync&distro=SUSE%20Package%20Hub%2015%20SP2
< 1.3.5-lp152.4.3.1+ 2 more
- (no CPE)range: < 1.3.5-lp152.4.3.1
- (no CPE)range: < 1.4.3-1.2
- (no CPE)range: < 1.3.5-bp152.4.3.1
Patches
Vulnerability mechanics
References
6- www.openwall.com/lists/oss-security/2021/02/22/1nvdExploitMailing ListThird Party Advisory
- bugzilla.redhat.com/show_bug.cginvdIssue TrackingThird Party Advisory
- lists.debian.org/debian-lts-announce/2022/07/msg00001.htmlnvdMailing ListThird Party Advisory
- security.gentoo.org/glsa/202208-15nvdThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CAXQLCK35QGRCRENRTGKJO4VVZGUXUJJ/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GVDEBZQJMWDW5JFK4NTHH6DAFNAZTESW/nvd
News mentions
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