Medium severity5.9NVD Advisory· Published Aug 5, 2021· Updated Jun 17, 2026
CVE-2021-29969
CVE-2021-29969
Description
If Thunderbird was configured to use STARTTLS for an IMAP connection, and an attacker injected IMAP server responses prior to the completion of the STARTTLS handshake, then Thunderbird didn't ignore the injected data. This could have resulted in Thunderbird showing incorrect information, for example the attacker could have tricked Thunderbird to show folders that didn't exist on the IMAP server. This vulnerability affects Thunderbird < 78.12.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
8cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*range: <78.12
- (no CPE)range: <78.12
- (no CPE)range: unspecified
- osv-coords5 versionspkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweedpkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP2pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP3
< 78.12.0-lp152.2.48.2+ 4 more
- (no CPE)range: < 78.12.0-lp152.2.48.2
- (no CPE)range: < 78.12.0-8.33.1
- (no CPE)range: < 91.1.1-1.1
- (no CPE)range: < 78.12.0-8.33.1
- (no CPE)range: < 78.12.0-8.33.1
Patches
Vulnerability mechanics
References
3- bugzilla.mozilla.org/show_bug.cginvdIssue TrackingPermissions RequiredVendor Advisory
- security.gentoo.org/glsa/202208-14nvdThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2021-30/nvdVendor Advisory
News mentions
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