Information disclosure in Mozilla Thunderbird

Published: 2021-04-20
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-29950
Exploitation vector Local
Public exploit N/A
Vulnerable software
Mozilla Thunderbird
Client/Desktop applications / Messaging software

Vendor Mozilla

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Cleartext storage of sensitive information

EUVDB-ID: #VU52375

Risk: Low


CVE-ID: CVE-2021-29950

CWE-ID: CWE-312 - Cleartext Storage of Sensitive Information

Exploit availability: No


The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to the way Thunderbird handles secret OpenPGP keys. The application unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import task. If the task runs into a failure, the secret key may remain in memory in its unprotected state. A local user or malicious application can read the key and use it to decrypt email messages.


Install updates from vendor's website.

Vulnerable software versions

Mozilla Thunderbird: 78.0 - 78.9.0, 68.0 - 68.12.1, 60.0 - 60.9.1

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?