CVE-2020-3843

A memory corruption issue was addressed with improved input validation. This issue is fixed in...

8.8 High

A memory corruption issue was addressed with improved input validation. This issue is fixed in iOS 12.4.7, watchOS 5.3.7. A remote attacker may be able to cause unexpected system termination or corrupt kernel memory.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

3.58%Up 3.5 points since Apr 14, 2021

What each source reports

NVD Score used 8.8

Record: CVE-2020-3843
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0: 9.3 HighAV:N/AC:M/Au:N/C:C/I:C/A:C
Weakness: CWE-787
Updated: 2026-11-02

CVE List No score

Record: CVE-2020-3843
Updated: 2026-11-02

EUVDEUVD-2020-25108 No score

Record: EUVD-2020-25108
Updated: 2026-11-03

GitHub AdvisoriesGHSA-p4qp-fw5j-87q5 8.8

A memory corruption issue was addressed with improved input validation. This issue is fixed in...

A memory corruption issue was addressed with improved input validation. This issue is fixed in macOS Catalina 10.15.3. A remote attacker may be able to cause unexpected system termination or corrupt kernel memory.

Record: GHSA-p4qp-fw5j-87q5
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-119, CWE-787
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-3843 is a high vulnerability (CVSS 8.8) in Apple Watchos, published February 27, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.58%, the 89th percentile. No source names a fixed version.

References

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