Exploited vulnerability · CISA KEV

Is CVE-2020-9859 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Apple Multiple Products · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-9859, Apple Multiple Products Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 516 days after it was published. It affects Apple Multiple Products. If you run it, CISA's required action is: Apply updates per vendor instructions.

What it is

Apple iOS, iPadOS, macOS, watchOS, and tvOS contain an unspecified vulnerability that may allow an application to execute code with kernel privileges.

What to do

1. Check whether you run it. Look for Multiple Products in your asset inventory, including appliances and cloud images. Stack check lists every exploited Apple CVE at once.
2. Apply the fix. Apply updates per vendor instructions.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 5 Jun 2020.
4. Get told next time. Email alerts when CISA adds a CVE for Apple.

Other exploited CVEs in Multiple Products

• CVE-2024-27834: Apple Multiple Products Improper Authentication Vulnerability (4 Nov 2026)
• CVE-2026-86950: Apple Multiple Products Out-of-Bounds Write Vulnerability (29 Sep 2026)
• CVE-2025-43510: Apple Multiple Products Improper Locking Vulnerability (20 Mar 2026)
• CVE-2025-43520: Apple Multiple Products Classic Buffer Overflow Vulnerability (20 Mar 2026)
• CVE-2025-31277: Apple Multiple Products Buffer Overflow Vulnerability (20 Mar 2026)
• CVE-2023-43000: Apple Multiple products Use-After-Free Vulnerability (5 Mar 2026)

References

• nvd.nist.gov/vuln/detail/CVE-2020-9859

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2021 · Apple scorecard · act-now radar.