An out-of-bounds read was addressed with improved input validation.

published 2020-04-01 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-25112

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.7%; EPSS 2.7% chance of exploitation in 30 days, percentile 85%
public exploits: 0; none known

An out-of-bounds read was addressed with improved input validation. This issue is fixed in macOS Catalina 10.15.3. A remote attacker may be able to leak memory.

Patch / fix

fixed in 1

Apple macOS macOS Catalina 10.15.3

Exploit prediction

2.66% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	10.0	AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

Apple macOS

Classification

Weakness

CWE-20 Improper Input Validation
CWE-125 Out-of-bounds Read

References

support.apple.com /HT210919
release-notes, vendor-advisory

Sources

CVE List CVE-2020-3847
NVD CVE-2020-3847

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary