# CVE-2021-30858

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.

- Page: https://www.vulneraibility.com/cve/CVE-2021-30858
- CVSS: 8.8
- Known exploited: yes, in CISA KEV since 2021-11-03; CISA due date 2021-11-17
- EPSS: 13.38% (percentile 96.5)
- Unvetted proof-of-concept code on GitHub: 2 GitHub proofs of concept (first 2021-10-14)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2025-01-29)
- Weakness: CWE-416
- Published: 2021-08-24

## Affected versions

- Apple iOS: affected < 14.8
- Apple macOS: affected < 11.6

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://support.apple.com/en-us/HT212804
- [other] https://support.apple.com/en-us/HT212807
- [other] http://seclists.org/fulldisclosure/2021/Sep/27
- [other] http://seclists.org/fulldisclosure/2021/Sep/25
- [other] http://seclists.org/fulldisclosure/2021/Sep/29
- [other] http://www.openwall.com/lists/oss-security/2021/09/20/1
- [advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO6DMTHZR57JDBOXPSNR2MKDMCRWV265/
- [other] http://seclists.org/fulldisclosure/2021/Sep/38
- [other] http://seclists.org/fulldisclosure/2021/Sep/39
- [advisory] https://www.debian.org/security/2021/dsa-4975
- [advisory] https://www.debian.org/security/2021/dsa-4976
- [other] https://support.apple.com/kb/HT212824
- [other] http://seclists.org/fulldisclosure/2021/Sep/50
- [advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XYNV7ASK4LQVAUMJXNXBS3Z7RVDQ2N3W/
- [other] http://www.openwall.com/lists/oss-security/2021/10/26/9
- [other] http://www.openwall.com/lists/oss-security/2021/10/27/1
- [other] http://www.openwall.com/lists/oss-security/2021/10/27/2
- [other] http://www.openwall.com/lists/oss-security/2021/10/27/4
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30858

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.