Vulnerability identifier: #VU57241

Vulnerability risk: Medium

CVSSv3.1: 6.2 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-38502

CWE-ID: CWE-319

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Mozilla Thunderbird
Client/Desktop applications / Messaging software

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to software ignores the configuration to require STARTTLS security for an SMTP connection. A remote attacker with ability to intercept network traffic can gain access to sensitive data.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Thunderbird: 91.0 - 91.1.2

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External links
http://www.mozilla.org/en-US/security/advisories/mfsa2021-47/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.