UBUNTU-CVE-2021-29969

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    UBUNTU-CVE-2021-29969

    Published: 5 Aug 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-29969
    Aliases:
    USN-5058-1

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2021-29969, https://www.mozilla.org/en-US/security/advisories/mfsa2021-30/#CVE-2021-29969, https://ubuntu.com/security/notices/USN-5058-1, https://www.cve.org/CVERecord?id=CVE-2021-29969

    Affected packages

    Package

    Name: thunderbird

    Purl: pkg:deb/ubuntu/thunderbird@1:78.13.0+build1-0ubuntu0.18.04.1?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1:78.13.0+build1-0ubuntu0.18.04.1

    Affected versions

    1:52.4.0+build1-0ubuntu2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2021-29969 | CVE-DB