CVE Feed

    Dashboard / CVE / CVE-2021-23992

    CVE-2021-23992

    Thunderbird did not check if the user ID associated with an OpenPGP key has a valid self signature. An attacker may create a crafted version of an OpenPGP key, by either replacing the original user ID, or by adding another user ID. If Thunderbird imports and accepts the crafted key, the Thunderbird user may falsely conclude that the false user ID belongs to the correspondent. This vulnerability affects Thunderbird < 78.9.1.

    Published:Apr 8, 2021
    Last Modified:Nov 21, 2024
    EPS:Jun 24, 2021
    EPSS Score:0.00087
    CVSS Score:4.3

    Affected Products

    Vendor
    Mozilla
    Product
    Thunderbird
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Eus

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

    Related CVEs

    CVE-2026-84642 (CVSS 7.5) — The values of the mail.allowed_attachment_hostnames advanced config setting were used in a regular expression …
    CVE-2026-84641 (CVSS 7.5) — A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID response…
    CVE-2026-84640 (CVSS 7.5) — A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerabili…
    CVE-2026-84639 (CVSS 9.1) — Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnera…
    CVE-2026-84637 (CVSS 9.8) — Malicious calendar invitations could use file URI attachments to launch local or network-hosted executables on…
    CVE-2026-84144 (CVSS 7.5) — Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1. Some of these bugs showed evidence…
    CVE-2026-84143 (CVSS 9.8) — Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of th…
    CVE-2026-84142 (CVSS 9.8) — Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or a…
    CVE-2026-84141 (CVSS 9.8) — Integer overflow in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 155, Firefox ESR…
    CVE-2026-84140 (CVSS 9.8) — Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ES…

    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