CVE-2021-30858
HIGHCVSS 8.8/10Actively ExploitedEPSS 13.49%
Last modified
CVE-2021-30858 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 13.49% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploitation Status
This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Apple | Ipados | >= 13.1, < 14.8 |
| Apple | Iphone Os | < 12.5.5 |
| Apple | Iphone Os | >= 13.0, < 14.8 |
| Apple | Macos | < 11.6 |
| Fedoraproject | Fedora | 33 |
| Fedoraproject | Fedora | 34 |
| Debian | Debian Linux | 10.0 |
| Debian | Debian Linux | 11.0 |
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
- 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
- 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
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30858US Government Resource
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is 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.
How severe is CVE-2021-30858?
CVE-2021-30858 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 13.49% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.
How do I fix CVE-2021-30858?
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-30858?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST