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Yandex BrowserApplication · Yandex

CVE-2021-25262

MEDIUM · 5.4 CVSS v3.1 Published 2025-05-21
Fix available
A fix is available. Upgrade to 21.3.0 or later.
See remediation →
61/100
Remediation priority · Elevated
Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

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

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Yandex Browser for Android prior to version 21.3.0 contains an IDN (Internationalized Domain Name) homograph attack vulnerability. Attackers can register domains using visually similar characters from different scripts (e.g., Cyrillic letters that appear identical to Latin letters) to impersonate legitimate websites and conduct phishing attacks.

MitigationUpdate Yandex Browser for Android to version 21.3.0 or later, which includes proper IDN homograph attack protection.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Yandex BrowserApplication
Affected:< 21.3.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm Yandex Browser is installed
    Open Android Settings > Apps > find Yandex Browser in the app list, or check the Play Store for Yandex Browser
    Affected if Yandex Browser is present on the device
  2. Find the installed version number
    In Settings > Apps > Yandex Browser > App info, or open Play Store app page and scroll to version information
    Affected if Version number cannot be determined or is not visible
  3. Compare version to affected range
    Compare your installed version to version 21.3.0 - if the installed version is a lower number (e.g., 21.2.5, 20.x, etc.), you are running an affected version
    Affected if Installed version is less than 21.3.0 (e.g., 21.2.x, 21.1.x, 20.x, etc.)

You are affected if Yandex Browser for Android is installed and its version number is below 21.3.0

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 21.3.0 or later
Fixed in 21.3.0
Interim mitigation

Update Yandex Browser for Android to version 21.3.0 or later, which includes proper IDN homograph attack protection.

Recommended fix High confidence

Yandex Browser for Android 21.3.0 or later

  1. Open Google Play Store on your Android device
  2. Search for Yandex Browser
  3. Ensure you are running version 21.3.0 or later
  4. If an update is available, tap Update to install the latest version
  5. Alternatively, navigate to your device's Settings > Apps > Yandex Browser > Update if auto-update is configured

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Yandex Browser Scoped from the published advisory
  • Consultation1.0 h
  • Implementation0.5 h
  • Testing1.0 h
  • Review / QA0.5 h
3.0 hours of engineering $750
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-25262 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data