HOMEVULNERABILITIESCVE-2020-13166
CRITICALPOC

CVE-2020-13166

CWE-798Published: May 19, 2020· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2020-13166 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

A proof-of-concept (PoC) exploit exists for CVE-2020-13166. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

mylittletools1 product(s)
mylittleadmin
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://packetstormsecurity.com/files/157808/Plesk-myLittleAdmin-ViewState-.NET-Deserialization.html
ADVISORYhttps://ssd-disclosure.com/ssd-advisory-mylittleadmin-preauth-rce/
ADVISORYhttp://packetstormsecurity.com/files/157808/Plesk-myLittleAdmin-ViewState-.NET-Deserialization.html
ADVISORYhttps://ssd-disclosure.com/ssd-advisory-mylittleadmin-preauth-rce/

All References (4)

→
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

Quick Facts

CVE IDCVE-2020-13166
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-798
CISA KEVNo
ExploitPOC
Affected1 vendor(s)
PublishedMay 19, 2020

Related CVEs (CWE-798)

CVE-2026-22769
KEV10.0
CVE-2026-8983
10.0
CVE-2023-1748
10.0
CVE-2026-8982
10.0
CVE-2026-45631
10.0
CVE-2021-40422
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-13166 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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