CVE-2020-13166

Name: CVE-2020-13166
Creator: NVD / NIST
Published: 2020-05-19T20:15:10.087+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 77.64%

Last modified Jun 17, 2026

CVE-2020-13166 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The management tool in MyLittleAdmin 3.8 allows remote attackers to execute arbitrary code because machineKey is hardcoded (the same for all customers' installations) in web.config, and can be used to send serialized ASP code.. EPSS estimates a 77.64% chance of exploitation in the next 30 days.

Description

The management tool in MyLittleAdmin 3.8 allows remote attackers to execute arbitrary code because machineKey is hardcoded (the same for all customers' installations) in web.config, and can be used to send serialized ASP code.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

77.64%

99.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-798

Affected Software

Vendor	Product	Versions
Mylittletools	Mylittleadmin	3.8

References

http://packetstormsecurity.com/files/157808/Plesk-myLittleAdmin-ViewState-.NET-Deserialization.htmlExploit, Third Party Advisory, VDB Entry
https://ssd-disclosure.com/ssd-advisory-mylittleadmin-preauth-rce/Exploit, Third Party Advisory
http://packetstormsecurity.com/files/157808/Plesk-myLittleAdmin-ViewState-.NET-Deserialization.htmlExploit, Third Party Advisory, VDB Entry
https://ssd-disclosure.com/ssd-advisory-mylittleadmin-preauth-rce/Exploit, Third Party Advisory

Timeline

Published: May 19, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-13166?

How severe is CVE-2020-13166?

CVE-2020-13166 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 77.64% probability of exploitation in the next 30 days.

How do I fix CVE-2020-13166?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-13166?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST