# CVE-2021-25254: Yandex Browser Lite for Android before 21.1.0 allows remote attackers to spoof the address bar.

> Remote attackers can spoof the address bar in Yandex Browser Lite for Android, potentially misleading users about the current site.

- **Severity:** High 8.2 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 21 May 2025
- **Updated:** 21 May 2025
- **Also known as:** GHSA-mjcq-3whq-7xjh

## What is CVE-2021-25254?

CVE-2021-25254 is a high-severity vulnerability in Yandex Browser Lite, published on 21 May 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Yandex Browser Lite for Android before 21.1.0 allows remote attackers to spoof the address bar.

Weakness: CWE-116 (Improper Encoding or Escaping of Output)

## Which versions are affected by CVE-2021-25254?

It affects 1 product.


Products: Yandex Yandex Browser.

## How do I fix CVE-2021-25254?

No fix has been published for CVE-2021-25254 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-25254 being exploited?

There is no known exploitation of CVE-2021-25254 in the wild and no public exploit code.

## Other vulnerabilities in Yandex Browser Lite

- [CVE-2024-6473](https://insights.sbomify.com/CVE-2024-6473/): DLL Hijacking in Yandex Browser (high 8.4)
- [CVE-2021-25255](https://insights.sbomify.com/CVE-2021-25255/): Yandex Browser Lite for Android prior to version 21.1.0 allows remote attackers to cause a denial of service. (high 8.3)
- [CVE-2021-25261](https://insights.sbomify.com/CVE-2021-25261/): Privilege escalation in Yandex Browser (Desktop) (high 7.8)
- [CVE-2022-28225](https://insights.sbomify.com/CVE-2022-28225/): Privilege escalation in Yandex Browser (Desktop) (high 7.8)
- [CVE-2022-28226](https://insights.sbomify.com/CVE-2022-28226/): Privilege escalation in Yandex Browser (Desktop) (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-25254 and fix it if it is affected.

What it is: CVE-2021-25254 is a high-severity vulnerability in Yandex Browser Lite, published on 21 May 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-25254 in the wild and no public exploit code.

Affected product: Yandex Browser Lite. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-25254/ (Markdown: https://insights.sbomify.com/CVE-2021-25254/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-25254
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-25254
- OSV: https://osv.dev/vulnerability/CVE-2021-25254

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-25254/
Summaries are generated and may contain mistakes; the official description above is the record.