Improper Verification of Cryptographic Signature Affecting thunderbird package, versions <1:78.10.0-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.43% (34th percentile)

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  • Snyk IDSNYK-ECHOLATEST-THUNDERBIRD-18319185
  • published26 Jul 2026
  • disclosed24 Jun 2021

Introduced: 24 Jun 2021

CVE-2021-23993  (opens in a new tab)
CWE-347  (opens in a new tab)

How to fix?

Upgrade Echo:latest thunderbird to version 1:78.10.0-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream thunderbird package and not the thunderbird package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1