How severe is CVE-2020-13166?

CVE-2020-13166 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-13166 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 78% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-13166?

CVE-2020-13166 affects Mylittletools Mylittleadmin. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-13166?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-13166 published?

CVE-2020-13166 was published on 2020-05-19 and last updated on 2026-06-17.

CVE-2020-13166

CVE-2020-13166 is a critical-severity vulnerability in Mylittletools Mylittleadmin with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 78% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-798.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 78% (100th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-798
Affected product: Mylittletools Mylittleadmin
Published: 2020-05-19
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-13166?: 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.
How severe is CVE-2020-13166?: CVE-2020-13166 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-13166 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 78% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-13166?: CVE-2020-13166 affects Mylittletools Mylittleadmin. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-13166?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-13166 published?: CVE-2020-13166 was published on 2020-05-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mylittletools:mylittleadmin:3.8:*:*:*:*:*:*:*

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