CVE-2021-30855
MEDIUMCVSS 5.5/10EPSS 2.40%
Last modified
CVE-2021-30855 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks. EPSS estimates a 2.40% chance of exploitation in the next 30 days.
Description
A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks. This issue is fixed in Security Update 2021-005 Catalina, iOS 14.8 and iPadOS 14.8, iOS 15 and iPadOS 15, watchOS 8, macOS Big Sur 11.6. An application may be able to access restricted files.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Apple | Ipados | < 14.8 |
| Apple | Iphone Os | < 14.8 |
| Apple | Mac Os X | < 10.15.7 |
| Apple | Mac Os X | 10.15.7 |
| Apple | Macos | < 11.6 |
| Apple | Tvos | < 15.0 |
| Apple | Watchos | < 8.0 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-30855?
A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks. This issue is fixed in Security Update 2021-005 Catalina, iOS 14.8 and iPadOS 14.8, iOS 15 and iPadOS 15, watchOS 8, macOS Big Sur 11.6. An application may be able to access restricted files.
How severe is CVE-2021-30855?
CVE-2021-30855 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 2.40% probability of exploitation in the next 30 days.
How do I fix CVE-2021-30855?
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-2021-30855?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST