CVE-2021-25254
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 · uneditedYandex Browser Lite for Android before 21.1.0 allows remote attackers to spoof the address bar.
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 confidenceThis is an address bar spoofing vulnerability in Yandex Browser Lite for Android versions prior to 21.1.0. Attackers can manipulate the browser to display a fraudulent URL in the address bar while actually rendering malicious content, enabling phishing attacks. The CVSS 5.3 indicates low attack complexity with no authentication required but limited impact scope.
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< 21.1.0CVSS 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
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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 checksWork through these to decide whether this CVE applies to you.
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Identify if Yandex Browser Lite is installedCheck the device or mobile device management (MDM) inventory for applications named 'Yandex Browser Lite' or 'Яндекс.Браузер Лайт' on Android devicesAffected if Yandex Browser Lite for Android is present on any device in the organization
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Locate the installed version numberOn Android, go to Settings > Apps > Yandex Browser Lite > App info, or query via ADB: 'adb shell dumpsys package com.yandex.browser.lite'Affected if Unable to retrieve version information or version field shows unknown
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Compare installed version against affected rangeCheck if the installed version is less than 21.1.0. Version format is typically major.minor.patch (e.g., 21.0.3, 20.9.5)Affected if Installed version is below 21.1.0 (e.g., 21.0.x, 20.x.x, or any version number less than 21.1.0)
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Verify the browser handles URL displayManual test: navigate to a known website and observe if the address bar correctly displays the URL being loaded. The vulnerability allows spoofed URLs to appear in the address barAffected if The address bar displays a different URL than the one actually being loaded in the page content
A user is affected if Yandex Browser Lite for Android is installed with a version number less than 21.1.0, as this version range contains the address bar spoofing vulnerability.
Generated from the published advisory. Verify against your own configuration.
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 · scoped21.1.0
Update Yandex Browser Lite for Android to version 21.1.0 or later. If updates are not immediately possible, advise users to avoid entering sensitive information while using the affected browser and implement browser deployment controls to restrict usage of unpatched versions.
21.1.0 or later
- Open the Google Play Store or Yandex's official app distribution channel
- Check the current version of Yandex Browser Lite for Android installed on the device
- Update Yandex Browser Lite for Android to version 21.1.0 or later
- Verify the update was successful by checking the app version after updating
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation1.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-25254 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-25254 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- 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