CVE-2021-1855
MEDIUMCVSS 6.5/10EPSS 0.76%
Last modified
CVE-2021-1855 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A logic issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3. EPSS estimates a 0.76% chance of exploitation in the next 30 days.
Description
A logic issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3. A malicious website may be able to force unnecessary network connections to fetch its favicon.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Apple | Macos | >= 11.0, < 11.3 |
References
- https://support.apple.com/en-us/HT212325Vendor Advisory
- https://support.apple.com/en-us/HT212325Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-1855?
A logic issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3. A malicious website may be able to force unnecessary network connections to fetch its favicon.
How severe is CVE-2021-1855?
CVE-2021-1855 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.76% probability of exploitation in the next 30 days.
How do I fix CVE-2021-1855?
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.
Related CVEs from 2021
- CVE-2021-1848The issue was addressed with improved UI handling. This issu…5.5
- CVE-2021-1849An issue in code signature validation was addressed with imp…7.5
- CVE-2021-1851A logic issue was addressed with improved state management. …8.8
- CVE-2021-1852An out-of-bounds read was addressed with improved input vali…5.5
- CVE-2021-1853A logic issue was addressed with improved state management. …7.8
- CVE-2021-1854A call termination issue with was addressed with improved lo…4.3
- CVE-2021-1857A memory initialization issue was addressed with improved me…6.5
- CVE-2021-1858Processing a maliciously crafted image may lead to arbitrary…7.8
- CVE-2021-1859A logic issue was addressed with improved state management. …7.5
- CVE-2021-1860A memory initialization issue was addressed with improved me…6.5
- CVE-2021-1861An issue existed in determining cache occupancy. The issue w…4.3
- CVE-2021-1862Description: A person with physical access may be able to ac…2.4
Are you affected by CVE-2021-1855?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST