Remote code execution in Mozilla Thunderbird

Published: 2021-01-12 | Updated: 2021-07-01
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-16044
Exploitation vector Network
Public exploit N/A
Vulnerable software
Mozilla Thunderbird
Client/Desktop applications / Messaging software

Vendor Mozilla

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Use-after-free

EUVDB-ID: #VU49300

Risk: High


CVE-ID: CVE-2020-16044

CWE-ID: CWE-416 - Use After Free

Exploit availability: No


The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when processing COOKIE-ECHO chunk in a SCTP packet. A remote attacker can pass specially crafted data to the browser, trigger a use-after-free error and execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.


Install update from vendor's website.

Vulnerable software versions

Mozilla Thunderbird: 78.0 - 78.6.0, 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?