How severe is CVE-2020-9858?

CVE-2020-9858 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-9858 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-9858?

CVE-2020-9858 affects Apple Windows Migration Assistant. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-9858?

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

When was CVE-2020-9858 published?

CVE-2020-9858 was published on 2020-06-09 and last updated on 2026-06-17.

CVE-2020-9858

CVE-2020-9858 is a high-severity vulnerability in Apple Windows Migration Assistant with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-427.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 4.4
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-427
Affected product: Apple Windows Migration Assistant
Published: 2020-06-09
Last modified: 2026-06-17

Description

A dynamic library loading issue was addressed with improved path searching. This issue is fixed in Windows Migration Assistant 2.2.0.0 (v. 1A11). Running the installer in an untrusted directory may result in arbitrary code execution.

Frequently asked questions

What is CVE-2020-9858?: A dynamic library loading issue was addressed with improved path searching. This issue is fixed in Windows Migration Assistant 2.2.0.0 (v. 1A11). Running the installer in an untrusted directory may result in arbitrary code execution.
How severe is CVE-2020-9858?: CVE-2020-9858 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-9858 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-9858?: CVE-2020-9858 affects Apple Windows Migration Assistant. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-9858?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-9858 published?: CVE-2020-9858 was published on 2020-06-09 and last updated on 2026-06-17.

References

https://support.apple.com/HT211186

Affected products (1)

cpe:2.3:a:apple:windows_migration_assistant:*:*:*:*:*:*:*:*

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