CVE-2020-13166

highpriority · attend · 76OT risk · highEPSS 0.776 · 100 %ileexploit · weaponizedEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

2 exploits · weaponized

Likely / severe?

77.6% (100th) EPSS

CVSS 7.5 · high

Is it mine?

2 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-24

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

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-798USprimary

exploits (2)

Public proof-of-concept and weaponised exploit code.

exploit/windows/http/plesk_mylittleadmin_viewstatePlesk/myLittleAdmin ViewState .NET Deserializationweaponized · metasploit
EDB-48513Plesk/myLittleAdmin - ViewState .NET Deserialization (Metasploit)functional · exploit_db

affected products (2)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
mylittletools mylittleadmin= 3.8nvdUScpe:2.3:a:mylittletools:mylittleadmin:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2020-05-19modified 2026-06-17

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+2274 more

references (9)

External citations — patches, advisories, analysis.

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