LiveActive security incident?Get immediate response
CVE Record

CVE-2021-30507: Inappropriate implementation in Offline in Google Chrome on Android prior to 90.0.4430.212 allowed a remote...

Inappropriate implementation in Offline in Google Chrome on Android prior to 90.0.4430.212 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This Chrome on Android flaw could let an attacker bypass site isolation after they already compromised the browser renderer. That makes it a follow-on weakness, not a standalone entry point. The main business action is ensuring Android Chrome is no longer below 90.0.4430.212.

Executive priority

Treat this as a browser hygiene priority, especially for managed Android fleets. It is not listed as known exploited in the supplied sources, but site isolation bypasses can increase impact when chained with other browser flaws.

Technical view

CVE-2021-30507 is an inappropriate implementation issue in Chrome Offline on Android before 90.0.4430.212. A remote attacker with an already compromised renderer process could use crafted HTML to bypass site isolation. The provided sources do not include CVSS, CWE, or detailed root-cause information.

Likely exposure

Exposure is most relevant to Android endpoints running Google Chrome earlier than 90.0.4430.212. The bundle also cites Gentoo and Fedora advisories, so vulnerability managers should check whether their Chromium packages referenced this CVE before declaring non-Android exposure.

Exploitation context

The source bundle does not show CISA KEV listing or other evidence of active exploitation. The stated attack condition requires a compromised renderer process, so this is likely part of a browser exploit chain rather than an initial compromise vector.

Researcher notes

Evidence is limited to the CVE description and advisory references. The bug tracker link is cited but the bundle provides no technical details. Avoid assuming exploitability beyond the stated renderer-compromise prerequisite and crafted HTML condition.

Mitigation direction

  • Update Chrome on Android to 90.0.4430.212 or later.
  • Enforce managed browser updates through MDM where available.
  • Review Gentoo and Fedora advisories for applicable Chromium package updates.
  • Check Google guidance before applying product-specific compensating controls.

Validation and detection

  • Inventory Android Chrome versions and flag anything below 90.0.4430.212.
  • Confirm managed devices received the updated Chrome build.
  • Review package advisory coverage for any maintained Chromium deployments.
  • Document exceptions where unsupported devices cannot receive browser updates.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · low confidence lookup

CVE-2021-30507 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
GoogleChromeunspecifiedListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.