Security readout for executives and security teams
Plain-English summary
CVE-2021-21200 is a low-severity Google Chrome memory-read issue fixed in Chrome 89.0.4389.72. A crafted HTML page could trigger an out-of-bounds read in WebUI Settings. Business urgency is mainly browser hygiene: legacy Chrome versions should be removed from managed fleets.
Executive priority
Treat this as routine patch governance, not an emergency, unless the organization still has legacy Chrome installations in production.
Technical view
Google describes an out-of-bounds read in Chrome WebUI Settings before 89.0.4389.72. The stated attack vector is a crafted HTML page by a remote attacker. The source bundle provides no CVSS, CWE, proof of exploitation, or detailed bug mechanics.
Likely exposure
Exposure is likely limited to endpoints running Google Chrome versions earlier than 89.0.4389.72. Current auto-updated Chrome installations should not be exposed based on the provided version boundary.
Exploitation context
The bundle does not indicate active exploitation, and the CVE is not marked KEV. Public details are sparse; the description only supports remote triggering through a crafted HTML page.
Researcher notes
The strongest evidence is the CVE description and Chrome release reference. The bundle lacks CVSS, CWE, and detailed Chromium bug context, so deeper root-cause analysis cannot be source-grounded here.
Mitigation direction
- Update Google Chrome to 89.0.4389.72 or later.
- Prioritize managed browser fleet updates through endpoint management.
- Remove unsupported Chrome versions from production endpoints.
- Check Google release notes and bug tracker for vendor guidance.
Validation and detection
- Inventory Chrome versions across managed endpoints.
- Flag any Chrome installation earlier than 89.0.4389.72.
- Confirm auto-update is enabled and succeeding.
- Verify no exception groups remain on vulnerable builds.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-21200 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://chromereleases.googleblog.com/2021/03/stable-channel-update-for-desktop.htmlCVE reference
- https://crbug.com/1164816CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.