How severe is CVE-2020-9945?

CVE-2020-9945 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2020-9945 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-9945?

CVE-2020-9945 primarily affects Apple Safari. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-9945?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-9945 published?

CVE-2020-9945 was published on 2020-12-08 and last updated on 2026-06-17.

CVE-2020-9945

CVE-2020-9945 is a medium-severity vulnerability in Apple Safari with a CVSS 3.x base score of 4.3. 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-1021.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.3
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1021
Affected product: Apple Safari
Published: 2020-12-08
Last modified: 2026-06-17

Description

A spoofing issue existed in the handling of URLs. This issue was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.0.1, Safari 14.0.1. Visiting a malicious website may lead to address bar spoofing.

Frequently asked questions

What is CVE-2020-9945?: A spoofing issue existed in the handling of URLs. This issue was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.0.1, Safari 14.0.1. Visiting a malicious website may lead to address bar spoofing.
How severe is CVE-2020-9945?: CVE-2020-9945 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2020-9945 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-9945?: CVE-2020-9945 primarily affects Apple Safari. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-9945?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-9945 published?: CVE-2020-9945 was published on 2020-12-08 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*

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