Is CVE-2021-30737 in the CISA KEV catalog?

No. CVE-2021-30737 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-30737?

CVE-2021-30737 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-30737?

CVE-2021-30737 has an EPSS score of 1.50% (71th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-30737?

Upgrade ipados to 14.6 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2021-30737

HIGHEPSS 71th pctl

8.8

CVSS v3

NVD

Description

A memory corruption issue in the ASN.1 decoder was addressed by removing the vulnerable code. This issue is fixed in tvOS 14.6, Security Update 2021-004 Mojave, iOS 14.6 and iPadOS 14.6, iOS 12.5.4, Security Update 2021-003 Catalina, macOS Big Sur 11.4, watchOS 7.5. Processing a maliciously crafted certificate may lead to arbitrary code execution.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

ipadosNVD

Affected:< 14.6Fixed in:14.6CVE-2021-30737derived from NVD

iphone osNVD

Affected:>= 13.0, < 14.6Fixed in:14.6CVE-2021-30737derived from NVD

macosNVD

Affected:>= 11.0.1, < 11.4Fixed in:11.4CVE-2021-30737derived from NVD

tvosNVD

Affected:< 14.6Fixed in:14.6CVE-2021-30737derived from NVD

watchosNVD

Affected:< 7.5Fixed in:7.5CVE-2021-30737derived 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

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.50%probability of exploitation in 30 days

71stpercentile

Elevated risk: more likely to be exploited than 71% of all known CVEs.

References

Vendor Advisory7

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	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.