Is CVE-2021-30858 being actively exploited?

Yes. CVE-2021-30858 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added on November 3, 2021.

What is the CVSS score for CVE-2021-30858?

CVE-2021-30858 has a CVSS 3.1 base score of 8.8 (HIGH).

CVE-2021-30858

HIGH · CVSS 8.8CISA KEV: actively exploitedEPSS 13.4%EU EUVD: exploited

A use after free issue was addressed with improved memory management. This issue is fixed in iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

Key facts

CVSS score: 8.8 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
EPSS score: 13.4% (96th percentile)
In CISA KEV: Yes, added November 3, 2021
In EU EUVD: Yes (EUVD-2021-17775)
Published: August 24, 2021
NVD last modified: June 17, 2026
Status: Analyzed

CISA Known Exploited Vulnerability

Apple iOS, iPadOS, macOS Use-After-Free Vulnerability

Added to the KEV catalog on November 3, 2021; federal remediation due November 17, 2021.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2021-17775 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on October 21, 2025.

View on the EU Vulnerability Database

Affected products

apple / ipados
apple / iphone os
apple / macos
debian / debian linux
debian / debian linux
fedoraproject / fedora
fedoraproject / fedora

Certified products that may be affected

6 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Strong Customer Authentication pour Apple Pay, sur MacBook Air 2020 avec M1 exécutant macOS Big Sur 11.3.1 - Apple Inc. - Common Criteria ANSSI-CC-2022/44 - active
Strong Customer Authentication pour Apple Pay sur iPhone SE (de seconde génération) exécutant iOS 14.5.1 Version 18E212 - Apple Inc. - Common Criteria ANSSI-CC-2022/05 - active
Strong Customer Authentication pour Apple Pay sur iPhone (SoC A12 Bionic) exécutant iOS 14.5.1 Version 18E212 - Apple Inc. - Common Criteria ANSSI-CC-2022/04 - active
Apple macOS 11 Big Sur: Contacts - Apple Inc. - Common Criteria CCEVS-VR-VID-11243-2022 - archived
Apple FileVault 2 on T2 systems running macOS Catalina 10.15 - Apple Inc. - Common Criteria CCEVS-VR-VID-11078-2021 - archived

See all 6 in the Security Certifications Explorer.

References

http://seclists.org/fulldisclosure/2021/Sep/25(Mailing List, Third Party Advisory)
http://seclists.org/fulldisclosure/2021/Sep/27(Mailing List, Third Party Advisory)
http://seclists.org/fulldisclosure/2021/Sep/29(Mailing List, Third Party Advisory)
http://seclists.org/fulldisclosure/2021/Sep/38(Mailing List, Third Party Advisory)
http://seclists.org/fulldisclosure/2021/Sep/39(Mailing List, Third Party Advisory)
http://seclists.org/fulldisclosure/2021/Sep/50(Mailing List, Third Party Advisory)
http://www.openwall.com/lists/oss-security/2021/09/20/1(Mailing List)
http://www.openwall.com/lists/oss-security/2021/10/26/9(Mailing List)
http://www.openwall.com/lists/oss-security/2021/10/27/1(Mailing List)
http://www.openwall.com/lists/oss-security/2021/10/27/2(Mailing List)
http://www.openwall.com/lists/oss-security/2021/10/27/4(Mailing List)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO6DMTHZR57JDBOXPSNR2MKDMCRWV265/(Release Notes)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XYNV7ASK4LQVAUMJXNXBS3Z7RVDQ2N3W/(Release Notes)
https://support.apple.com/en-us/HT212804(Third Party Advisory)
https://support.apple.com/en-us/HT212807(Third Party Advisory)
https://support.apple.com/kb/HT212824(Third Party Advisory)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30858(US Government Resource)
https://www.debian.org/security/2021/dsa-4975(Mailing List, Third Party Advisory)
https://www.debian.org/security/2021/dsa-4976(Mailing List, Third Party Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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