CVE-2021-1861
MEDIUMCVSS 4.3/10EPSS 0.84%
Last modified
CVE-2021-1861 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. An issue existed in determining cache occupancy. The issue was addressed through improved logic. EPSS estimates a 0.84% chance of exploitation in the next 30 days.
Description
An issue existed in determining cache occupancy. The issue was addressed through improved logic. This issue is fixed in macOS Big Sur 11.3. A malicious website may be able to track users by setting state in a cache.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/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-2021-1861?
An issue existed in determining cache occupancy. The issue was addressed through improved logic. This issue is fixed in macOS Big Sur 11.3. A malicious website may be able to track users by setting state in a cache.
How severe is CVE-2021-1861?
CVE-2021-1861 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.84% probability of exploitation in the next 30 days.
How do I fix CVE-2021-1861?
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.
Are you affected by CVE-2021-1861?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST