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CVE-2021-23993 Detail

Current Description

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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  6.5 MEDIUM
Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1666360 Issue Tracking  Permissions Required  Vendor Advisory 
https://www.mozilla.org/security/advisories/mfsa2021-13/ Release Notes  Vendor Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-327 Use of a Broken or Risky Cryptographic Algorithm cwe source acceptance level NIST  

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Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-23993
NVD Published Date:
06/24/2021
NVD Last Modified:
07/06/2021
Source:
Mozilla Corporation