Use of a Broken or Risky Cryptographic Algorithm The advisory has been revoked - it doesn't affect any version of package thunderbird  (opens in a new tab)


Threat Intelligence

EPSS
0.05% (18th percentile)

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  • Snyk IDSNYK-UBUNTU2004-THUNDERBIRD-1245187
  • published6 May 2021
  • disclosed24 Jun 2021

Introduced: 6 May 2021

CVE-2021-23993  (opens in a new tab)
CWE-327  (opens in a new tab)

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:20.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream thunderbird package and not the thunderbird package as distributed by Ubuntu.

An attacker may perform a DoS attack to prevent a user from sending encrypted email to a correspondent. If an attacker creates a crafted OpenPGP key with a subkey that has an invalid self signature, and the Thunderbird user imports the crafted key, then Thunderbird may try to use the invalid subkey, but the RNP library rejects it from being used, causing encryption to fail. This vulnerability affects Thunderbird < 78.9.1.