Is CVE-2020-9991 in the CISA KEV catalog?

No. CVE-2020-9991 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-9991?

CVE-2020-9991 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-9991?

CVE-2020-9991 has an EPSS score of 2.79% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-9991?

Upgrade iCloud (Legacy) to 11.4 or later.

CVE & CISA-KEV Catalog

CVE-2020-9991

HIGHEPSS 85th pctl

7.5

CVSS v3

NVD

Description

This issue was addressed with improved checks. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.0, iOS 14.0 and iPadOS 14.0, iCloud for Windows 7.21, tvOS 14.0. A remote attacker may be able to cause a denial of service.

How to fix

Remediation Available

iCloud (Legacy)Windows application

Affected:11.0 11.4Fixed in:11.4Apple Inc.

Affected:7.21Fixed in:7.21Apple Inc.

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

2.79%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Vendor Advisory6

Third-Party Advisory1

seclists.org

Other references1

lists.apache.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.