CVE-2021-25263
7.8 · HIGHOverview
CVE-2021-25263 is a high-severity vulnerability affecting yandex yandex_browser. It was published on August 17, 2021 and has a CVSS 3.1 base score of 7.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from yandex. Update yandex_browser to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| yandex | yandex_browser | >= 0, < 21.9.0.390 | Affected |
Frequently Asked Questions
What is CVE-2021-25263?
CVE-2021-25263 is a high-severity vulnerability affecting yandex yandex_browser. It was published on August 17, 2021 and has a CVSS 3.1 base score of 7.8 (HIGH).
How severe is CVE-2021-25263?
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2021-25263?
Check the references section for vendor advisories and patches from yandex. Update yandex_browser to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-25263?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-25263 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
AI-driven PR review catches vulnerable dependencies before they ship.
Browser-based exploitation validates findings with real proof-of-concept.
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