Arbitrary file upload in Google Chrome
CVE-2021-21131
Insufficient policy enforcement in File System API in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to bypass filesystem restrictions via a crafted HTML page.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.076 (94.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 94.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.076 · newest: 0.076 · change: 0.000
Affected products
- Google Chrome — versions unspecified
- Microsoft Edge Chromium
Weakness classification (CWE)
Public proof-of-concept exploits
References
- chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop_19.html (Release Notes, Vendor Advisory)
- crbug.com/1140417 (Permissions Required, Third Party Advisory)
- msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-21131 (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-21131?
- CVE-2021-21131 is a medium-severity vulnerability in Google Chrome, classified under Improper Link Resolution Before File Access. CVSS score: 6.5/10. Published 2021-02-09.
- How severe is CVE-2021-21131?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2021-21131 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.