What is CVE-2021-39633?

CVE-2021-39633 is a medium-severity vulnerability in Google Android, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.5/10. Published 2022-01-14.

How severe is CVE-2021-39633?

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

Buffer overflow in Google Android

CVE-2021-39633

In gre_handle_offloads of ip_gre.c, there is a possible page fault due to an invalid memory access. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-150694665References: Upstream kernel

Vulnerability class: Buffer Overflow

Published 2022-01-14 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.002 (6.9th percentile), scored 2026-10-06.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 6.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Google Android
Android — versions Android kernel

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

source.android.com/security/bulletin/2022-01-01 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-39633?: CVE-2021-39633 is a medium-severity vulnerability in Google Android, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.5/10. Published 2022-01-14.
How severe is CVE-2021-39633?: Medium severity. CVSS v3 base score is 5.5 out of 10.