Apple Multiple Buffer Overflow Vulnerability
Apple iOS, macOS, tvOS, watchOS, and visionOS contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow an attacker with memory write the capability to execute arbitrary code.
- Vendor
- Apple
- Product
- Multiple Products
- CVSS
- 7.8
- EPSS (exploit probability)
- 1.4%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2026-20700 being exploited?
Yes. CISA added CVE-2026-20700 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 1.4% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-21. Full cross-catalog view: /kev-comparison
What to do
CISA required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
US federal civilian agencies must remediate by (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Apple CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2026-86950 CoreGraphics memory confusion in Apple iOS 26, iPadOS, macOS 26, macOS 15write-up | [ HIGH ] | 8.8 | 1.2% | |
| CVE-2026-65400 Apple macOS Improper Authentication Vulnerability | [ CRITICAL ] | 9.8 | 1.7% | |
| CVE-2025-43520 Apple Multiple Products Classic Buffer Overflow Vulnerability | [ MEDIUM ] | 5.5 | 0.4% | |
| CVE-2025-43510 Apple Multiple Products Improper Locking Vulnerability | [ HIGH ] | 7.8 | 0.4% | |
| CVE-2025-31277 Apple Multiple Products Buffer Overflow Vulnerability | [ HIGH ] | 8.8 | 1.7% | |
| CVE-2023-43000 Apple Multiple products Use-After-Free Vulnerability | [ HIGH ] | 8.8 | 4.0% | |
| CVE-2023-41974 Apple iOS and iPadOS Use-After-Free Vulnerability | [ HIGH ] | 7.8 | 2.0% | |
| CVE-2021-30952 Apple Multiple Products Integer Overflow or Wraparound Vulnerability | [ HIGH ] | 7.8 | 7.0% |