What is CVE-2021-25255?

CVE-2021-25255 is a high-severity vulnerability in Yandex Browser Lite, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2025-05-21.

How severe is CVE-2021-25255?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-25255 known to be exploited?

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

Improper input validation in Yandex Browser Lite

CVE-2021-25255

Yandex Browser Lite for Android prior to version 21.1.0 allows remote attackers to cause a denial of service.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.007 (48.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Yandex Browser Lite — versions 21.1.0
Yandex Yandex_browser

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

KirtiRamchandani/KirtiRamchandani

References

browser-security@yandex-team.ru (Vendor Advisory)

Frequently asked questions

What is CVE-2021-25255?: CVE-2021-25255 is a high-severity vulnerability in Yandex Browser Lite, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2025-05-21.
How severe is CVE-2021-25255?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-25255 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.