What’s Vulnerable › Vulnerabilities

CVE-2021-25263

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-17 · updated 2026-06-17
• Weakness: CWE-732

Description

Local privilege vulnerability in Yandex Browser for Windows prior to 21.9.0.390 allows a local, low privileged, attacker to execute arbitary code with the SYSTEM privileges through manipulating files in directory with insecure permissions during Yandex Browser update process.

Affected products

• Yandex N.V. Yandex Browser for desktop: before 21.9.0.390 — fixed in 21.9.0.390

How to fix

Upgrade to a fixed version: Yandex N.V. Yandex Browser for desktop 21.9.0.390. Check the vendor advisory for mitigations.

References

• https://yandex.com/bugbounty/i/hall-of-fame-browser/
• https://yandex.com/bugbounty/i/hall-of-fame-browser/

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