CVE-2020-13166

CRITICALNVD 9.89.8—Weaponized

9.8

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.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 99.0%
KEV: Not listed

Published

May 19, 2020

Last Modified

November 21, 2024

References (4)

cve@mitrehttp://packetstormsecurity.com/files/157808/Plesk-myLittleAdmin-ViewState-.NET-Deserialization.html
cve@mitrehttps://ssd-disclosure.com/ssd-advisory-mylittleadmin-preauth-rce/
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/157808/Plesk-myLittleAdmin-ViewState-.NET-Deserialization.html
af854a3a-2127-422b-91ae-364da2661108https://ssd-disclosure.com/ssd-advisory-mylittleadmin-preauth-rce/

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 9× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-01 13:50 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 03:29 UTCEG score recompute
2026-05-27 03:29 UTCGHSA enrichment

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 Metasploit module) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-48513✓ verified
First seen May 25, 2020
Plesk/myLittleAdmin - ViewState .NET Deserialization (Metasploit)
Open source ↗
Metasploitexploit/windows/http/plesk_mylittleadmin_viewstate✓ verified
First seen May 15, 2020
Plesk/myLittleAdmin ViewState .NET Deserialization
Open source ↗

Frequently asked(5)

What is CVE-2020-13166?

CVE-2020-13166 is a critical vulnerability published on May 19, 2020. 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.

When was CVE-2020-13166 disclosed?

CVE-2020-13166 was first published in the National Vulnerability Database on May 19, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-13166 actively exploited?

CVE-2020-13166 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-13166?

CVE-2020-13166 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2020-13166?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-13166, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2020-13166

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(2)

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-13166?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)