What is CVE-2021-25262?

CVE-2021-25262 is a medium-severity vulnerability in Google Android, classified under Improper Encoding or Escaping of Output. CVSS score: 5.4/10. Published 2025-05-21.

How severe is CVE-2021-25262?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2021-25262 known to be exploited?

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

Vulnerability in Google Android

CVE-2021-25262

Yandex Browser for Android prior to version 21.3.0 allows remote attackers to perform IDN homograph attack.

Published 2025-05-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (35.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-116 — Improper Encoding or Escaping of Output

Public proof-of-concept exploits

KirtiRamchandani/KirtiRamchandani

References

yandex.com/bugbounty/i/hall-of-fame-browser/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-25262?: CVE-2021-25262 is a medium-severity vulnerability in Google Android, classified under Improper Encoding or Escaping of Output. CVSS score: 5.4/10. Published 2025-05-21.
How severe is CVE-2021-25262?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2021-25262 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.