CVE-2020-13166
The management tool in MyLittleAdmin 3.8 allows remote attackers to execute arbitrary code because machineKey is hardcoded (the same for…
- 9.8CriticalCVSS base score
- 77.6%Exploitation in 30 daysEPSS · top 0.4% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- 2Public exploitsMetasploit, Nuclei and Exploit-DB
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list a Metasploit module and an Exploit-DB entry for it.
Show the exploits2
Metasploit modules1 module
- Plesk/myLittleAdmin ViewState .NET Deserialization (Metasploit module) (opens in a new tab)
exploit/windows/http/plesk_mylittleadmin_viewstateRank excellentdisclosed 15 May 2020
Exploit-DB1 entry
- Plesk/myLittleAdmin - ViewState .NET Deserialization (Metasploit) (Exploit-DB entry) (opens in a new tab)
EDB-ID 48513remote, windowspublished 25 May 2020Verified
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By mitre
Published
- 4 years later
· 4 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 77.6% · top 0.4% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
n/a
- affected n/a
References
References2
- https://ssd-disclosure.com/ssd-advisory-mylittleadmin-preauth-rce/ (opens in a new tab)x_refsource_MISCx_transferred
- http://packetstormsecurity.com/files/157808/Plesk-myLittleAdmin-ViewState-.NET-Deserialization.html (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2020-5438 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2020-13166)Record last updated .