Vulnerability in Yandex Browser

CVE-2021-25263

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (33.2th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-25263: held from 0.003 to 0.004.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001

Affected products

  • Yandex Browser
  • Yandex Browser (Desktop) — versions All versions prior to version 21.9.0.390

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2021-25263?
CVE-2021-25263 is a high-severity vulnerability in Yandex Browser, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 7.8/10. Published 2021-08-17.
How severe is CVE-2021-25263?
High severity. CVSS v3 base score is 7.8 out of 10.