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5.3

A certificate validation issue was addressed. This issue is fixed in iOS 14.5 and iPadOS 14.5. An attacker in a privileged network position may be able to alter network traffic.

CVE-2021-1837 · published 5 years ago
Summary

A certificate validation issue was addressed. This issue is fixed in iOS 14.5 and iPadOS 14.5. An attacker in a privileged network position may be able to alter network traffic.

What to do
  • Update apple ipados to version 14.5 or later.
  • Update apple iphone_os to version 14.5 or later.
Affected software
VendorProductAffected versions
apple ipados < 14.5
cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
apple iphone_os < 14.5
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
Original advisory text
A certificate validation issue was addressed. This issue is fixed in iOS 14.5 and iPadOS 14.5. An attacker in a privileged network position may be able to alter network traffic.
A certificate validation issue was addressed. This issue is fixed in iOS 14.5 and iPadOS 14.5. An attacker in a privileged network position may be able to alter network traffic.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
5.3 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-295Improper Certificate Validation
Timeline
Published8 Sep 2021
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2021-1837 · NVD
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