CVE-2021-21125
Insufficient policy enforcement in File System API in Google Chrome on Windows prior to 88.0.4324.96 allowed a remote attacker to bypass filesystem restrictions via a crafted HTML page.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (8.08%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Insufficient policy enforcement in File System API in Google Chrome on Windows prior to 88.0.4324.96 allowed a remote attacker to bypass filesystem restrictions via a crafted HTML page.
- CVSS 3.1
- 8.1 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
- EPSS
- 8.08% probability · 95th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-59
- Affected
- google/chrome · microsoft/edge chromium
- Source
- chrome-cve-admin@google.com
EPSS 8.1% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop_19.htmlRelease Notes, Vendor Advisory
- https://crbug.com/1152327Permissions Required, Third Party Advisory
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-21125Third Party Advisory
- https://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop_19.htmlRelease Notes, Vendor Advisory
- https://crbug.com/1152327Permissions Required, Third Party Advisory
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-21125Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.