CVE-2021-30737

Name: CVE-2021-30737
Creator: NVD / NIST
Published: 2021-09-08T14:15:09.337+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.45%

Last modified Jun 17, 2026

CVE-2021-30737 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 1.45% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

1.45%

70.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 14.6
Apple	Iphone Os	< 12.5.4
Apple	Iphone Os	>= 13.0, < 14.6
Apple	Mac Os X	>= 10.14.0, <= 10.14.5
Apple	Mac Os X	>= 10.15, <= 10.15.5
Apple	Mac Os X	10.14.6
Apple	Mac Os X	10.15.6
Apple	Mac Os X	10.15.7
Apple	Macos	>= 11.0.1, < 11.4
Apple	Tvos	< 14.6
Apple	Watchos	< 7.5

References

https://support.apple.com/en-us/HT212528Vendor Advisory
https://support.apple.com/en-us/HT212529Vendor Advisory
https://support.apple.com/en-us/HT212530Vendor Advisory
https://support.apple.com/en-us/HT212531Vendor Advisory
https://support.apple.com/en-us/HT212532Vendor Advisory
https://support.apple.com/en-us/HT212533Vendor Advisory
https://support.apple.com/en-us/HT212548Vendor Advisory
https://support.apple.com/en-us/HT212528Vendor Advisory
https://support.apple.com/en-us/HT212529Vendor Advisory
https://support.apple.com/en-us/HT212530Vendor Advisory
https://support.apple.com/en-us/HT212531Vendor Advisory
https://support.apple.com/en-us/HT212532Vendor Advisory
https://support.apple.com/en-us/HT212533Vendor Advisory
https://support.apple.com/en-us/HT212548Vendor Advisory

Timeline

Published: Sep 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-30737?

How severe is CVE-2021-30737?

CVE-2021-30737 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.45% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30737?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-30737?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST