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MitM attack in Mutt

Published: 2020-07-01
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-14954
Exploitation vector Network
Public exploit N/A
Vulnerable software
Client/Desktop applications / Office applications


Security Advisory

This security advisory describes one medium risk vulnerability.

1) Code injection

Severity: Medium

CVSSv3: 5.7 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-14954

CWE-ID: CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Exploit availability: No


The vulnerability allows a remote attacker to perform a spoofing attack.

The vulnerability exists due to insecure implementation of the STARTTLS buffering for IMAP, SMTP, and POP3 protocols. A remote attacker can inject arbitrary data into the TLS context during MitM attack, e.g. perform a response injection attack.


Install updates from vendor's website.

Vulnerable software versions

Mutt: 1.14, 1.14.1, 1.14.2, 1.14.3

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open an attachment in an e-mail message.

Is there known malware, which exploits this vulnerability?

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