How severe is CVE-2021-30800?

CVE-2021-30800 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-30800 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-30800?

CVE-2021-30800 affects Apple Iphone Os. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-30800?

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-2021-30800 published?

CVE-2021-30800 was published on 2021-09-08 and last updated on 2026-06-17.

CVE-2021-30800

CVE-2021-30800 is a high-severity vulnerability in Apple Iphone Os with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 5.8
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Apple Iphone Os
Published: 2021-09-08
Last modified: 2026-06-17

Description

This issue was addressed with improved checks. This issue is fixed in iOS 14.7. Joining a malicious Wi-Fi network may result in a denial of service or arbitrary code execution.

Frequently asked questions

What is CVE-2021-30800?: This issue was addressed with improved checks. This issue is fixed in iOS 14.7. Joining a malicious Wi-Fi network may result in a denial of service or arbitrary code execution.
How severe is CVE-2021-30800?: CVE-2021-30800 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-30800 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-30800?: CVE-2021-30800 affects Apple Iphone Os. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-30800?: 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-2021-30800 published?: CVE-2021-30800 was published on 2021-09-08 and last updated on 2026-06-17.

References

https://support.apple.com/en-us/HT212601

Affected products (1)

cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*

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