Is CVE-2021-30755 in the CISA KEV catalog?

No. CVE-2021-30755 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-30755?

CVE-2021-30755 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-30755?

CVE-2021-30755 has an EPSS score of 1.33% (68th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-30755?

Upgrade macos to 11.4 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-30755

MEDIUM

6.5

CVSS v3

NVD

Description

Processing a maliciously crafted font may result in the disclosure of process memory. This issue is fixed in macOS Big Sur 11.4, tvOS 14.6, watchOS 7.5. An out-of-bounds read was addressed with improved input validation.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

macosNVD

Affected:>= 11.0, < 11.4Fixed in:11.4CVE-2021-30755derived from NVD

tvosNVD

Affected:< 14.6Fixed in:14.6CVE-2021-30755derived from NVD

watchosNVD

Affected:< 7.5Fixed in:7.5CVE-2021-30755derived from NVD

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 InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.33%probability of exploitation in 30 days

68thpercentile

Moderate risk: more likely to be exploited than 68% of all known CVEs.

References

Vendor Advisory3

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix

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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.