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Fencer Intel
high 7.8

CVE-2020-3878 json

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

published 6y ago modified 4mo ago also EUVD-2020-25143

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
9.1%
EPSS 9.1% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

An out-of-bounds read was addressed with improved input validation. This issue is fixed in iOS 13.5 and iPadOS 13.5, macOS Catalina 10.15.5, tvOS 13.4.5, watchOS 6.2.5, iTunes 12.10.7 for Windows, iCloud for Windows 11.2, iCloud for Windows 7.19. Processing a maliciously crafted image may lead to arbitrary code execution.

Patch / fix

  • Apple iOS iOS 13.5 and iPadOS 13.5
  • Apple macOS macOS Catalina 10.15.5
  • Apple tvOS tvOS 13.4.5
  • Apple watchOS watchOS 6.2.5
  • Apple iTunes for Windows iTunes 12.10.7 for Windows
  • Apple iCloud for Windows iCloud for Windows 11.2
  • Apple iCloud for Windows (Legacy) iCloud for Windows 7.19

Is CVE-2020-3878 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

9.13% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Apple iOS
  • Apple macOS
  • Apple tvOS
  • Apple watchOS
  • Apple iTunes for Windows
  • Apple iCloud for Windows
  • Apple iCloud for Windows (Legacy)

Classification

Weakness

References

Sources

Fencer Intel 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.