What is CVE-2021-34423?

CVE-2021-34423 is a critical-severity vulnerability in Apple Iphone_os, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-11-24.

How severe is CVE-2021-34423?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-34423 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Apple Iphone_os

CVE-2021-34423

A buffer overflow vulnerability was discovered in Zoom Client for Meetings (for Android, iOS, Linux, macOS, and Windows) before version 5.8.4, Zoom Client for Meetings for Blackberry (for Android and iOS) before version 5.8.1, Zoom Client…

Vulnerability class: Buffer Overflow

EPSS: 0.032 (86.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

References

security@zoom.us (x_refsource_MISC, Vendor Advisory)
security@zoom.us (VDB Entry, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-34423?: CVE-2021-34423 is a critical-severity vulnerability in Apple Iphone_os, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-11-24.
How severe is CVE-2021-34423?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-34423 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.