CVE-2021-1837

Name: CVE-2021-1837
Creator: NVD / NIST
Published: 2021-09-08T15:15:10.703+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.48%

Last modified Jun 17, 2026

CVE-2021-1837 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A certificate validation issue was addressed. This issue is fixed in iOS 14.5 and iPadOS 14.5. EPSS estimates a 0.48% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

0.48%

37.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 14.5
Apple	Iphone Os	< 14.5

References

https://support.apple.com/en-us/HT212317Vendor Advisory
https://support.apple.com/en-us/HT212317Vendor Advisory

Timeline

Published: Sep 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-1837?

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.

How severe is CVE-2021-1837?

CVE-2021-1837 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.48% probability of exploitation in the next 30 days.

How do I fix CVE-2021-1837?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-1837?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST