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Man-in-the-middle attack in em-imap

Published: 2020-05-22
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-13163
Exploitation vector Network
Public exploit N/A
Vulnerable software
Other software / Other software solutions

Vendor Conrad Irwin

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Improper Certificate Validation

Severity: Medium

CVSSv3: 6.4 [CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-13163

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: No


The vulnerability allows a remote attacker to perform a man-in-the-middle (MitM) attack.

The vulnerability exists due to the affected software uses the library eventmachine in an insecure way when the hostname in a TLS server certificate is not verified. A remote attacker can perform a MitM attack against users of the library.


Install updates from vendor's website.

Vulnerable software versions

em-imap: 0.5

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.

Is there known malware, which exploits this vulnerability?

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