What is CVE-2021-30940?

CVE-2021-30940 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.5/10. Published 2021-08-24.

How severe is CVE-2021-30940?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Apple iOS And Ipados

CVE-2021-30940

A buffer overflow issue was addressed with improved memory handling. This issue is fixed in macOS Monterey 12.1, iOS 15.2 and iPadOS 15.2, macOS Big Sur 11.6.2, Security Update 2021-008 Catalina. Processing a maliciously crafted USD file may disclose memory contents.

Vulnerability class: Buffer Overflow

Published 2021-08-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (60.0th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 60.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Apple iOS And Ipados — versions unspecified
Apple Ipados
Apple Iphone OS
Apple macOS — versions unspecified
Apple Mac OS X — versions 10.15.7

Weakness classification (CWE)

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

References

Frequently asked questions

What is CVE-2021-30940?: CVE-2021-30940 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.5/10. Published 2021-08-24.
How severe is CVE-2021-30940?: Medium severity. CVSS v3 base score is 5.5 out of 10.