What is CVE-2021-25480?

CVE-2021-25480 is a medium-severity vulnerability in Google Android, classified under Authentication Bypass by Capture-replay. CVSS score: 4.4/10. Published 2021-10-06.

How severe is CVE-2021-25480?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Vulnerability in Google Android

CVE-2021-25480

A lack of replay attack protection in GUTI REALLOCATION COMMAND message process in Qualcomm modem prior to SMR Oct-2021 Release 1 can lead to remote denial of service on mobile network connection.

Published 2021-10-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.005 (38.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Google Android — versions 8.0, 8.1, 9.0
Qualcomm
Samsung Mobile Devices — versions O(8.1), P(9.0), Q(10.0), R(11.0)

Weakness classification (CWE)

CWE-294 — Authentication Bypass by Capture-replay

References

security.samsungmobile.com/securityUpdate.smsb (Vendor Advisory)

Frequently asked questions

What is CVE-2021-25480?: CVE-2021-25480 is a medium-severity vulnerability in Google Android, classified under Authentication Bypass by Capture-replay. CVSS score: 4.4/10. Published 2021-10-06.
How severe is CVE-2021-25480?: Medium severity. CVSS v3 base score is 4.4 out of 10.