CVE-2021-30858
Apple iOS, iPadOS, macOS Use-After-Free Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 17 November 2021). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
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.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 13.38% probability · 96th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 3 November 2021 · due 17 November 2021
- Weakness
- CWE-416
- Affected
- apple/ipados · apple/iphone os · apple/macos · fedoraproject/fedora · debian/debian linux
- Source
- product-security@apple.com
EPSS 13.4% since 30 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-30858
References
- http://seclists.org/fulldisclosure/2021/Sep/25Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Sep/27Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Sep/29Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Sep/38Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Sep/39Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Sep/50Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/09/20/1Mailing List
- http://www.openwall.com/lists/oss-security/2021/10/26/9Mailing List
- http://www.openwall.com/lists/oss-security/2021/10/27/1Mailing List
- http://www.openwall.com/lists/oss-security/2021/10/27/2Mailing List
- http://www.openwall.com/lists/oss-security/2021/10/27/4Mailing 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/HT212804Third Party Advisory
- https://support.apple.com/en-us/HT212807Third Party Advisory
- https://support.apple.com/kb/HT212824Third Party Advisory
- https://www.debian.org/security/2021/dsa-4975Mailing List, Third Party Advisory
- https://www.debian.org/security/2021/dsa-4976Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Sep/25Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Sep/27Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Sep/29Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Sep/38Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Sep/39Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Sep/50Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/09/20/1Mailing List
- http://www.openwall.com/lists/oss-security/2021/10/26/9Mailing List
- http://www.openwall.com/lists/oss-security/2021/10/27/1Mailing List
- http://www.openwall.com/lists/oss-security/2021/10/27/2Mailing List
- http://www.openwall.com/lists/oss-security/2021/10/27/4Mailing List
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO6DMTHZR57JDBOXPSNR2MKDMCRWV265/Release Notes
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.