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CVE-2020-13166

86
FAUCET Score

CVE-2020-13166 is a critical vulnerability affecting MyLittleAdmin 3.8, allowing remote attackers to execute arbitrary code. The flaw stems from a hardcoded machineKey in the web.config file, enabling the submission of serialized ASP code. With a CVSS score of 9.8 (CRITICAL) and an EPSS score indicating high exploitability, this vulnerability poses a significant risk of complete compromise (confidentiality, integrity, availability). While not on the KEV catalog, exploit code is publicly available via Metasploit and ExploitDB, and the vulnerability has garnered substantial community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
3.8CPE matchmatch criteria
cpe:2.3:a:mylittletools:mylittleadmin:3.8:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
77.64%
Probability of exploitation in next 30 days
EPSS Percentile
99.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Metasploit: Plesk/myLittleAdmin ViewState .NET Deserialization · May 15, 2020
ExploitDB: EDB-48513 · May 25, 2020
This CVE's current EPSS score of 0.7763 is in the 98th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

packetstormsecurity.com / files/157808/Plesk-myLittleAdmin-ViewState-.NET-Deserialization.html
ExploitThird Party AdvisoryVDB Entry
ssd-disclosure.com / ssd-advisory-mylittleadmin-preauth-rce
ExploitThird Party Advisory