Security readout for executives and security teams
Plain-English summary
This is a Chrome browser flaw in V8, Chrome's JavaScript engine. A malicious web page could corrupt memory after a user visits it. Because CISA lists CVE-2021-30632 as known exploited, organizations should treat old Chrome installations as urgent exposure, especially on user workstations used for web browsing and email links.
Executive priority
Treat as urgent browser patching debt. The issue is old, but KEV status means exploitation was observed and unpatched endpoints remain high-value targets through normal browsing activity.
Technical view
CVE-2021-30632 is a CWE-787 out-of-bounds write in V8 affecting Google Chrome before 93.0.4577.82. The CVSS 3.1 score is 8.8 with network attack vector, low complexity, no privileges required, and user interaction required. The described impact is potential heap corruption through crafted HTML.
Likely exposure
Exposure is most likely on endpoints running Google Chrome prior to 93.0.4577.82. Fedora advisories indicate relevant packaged browser updates for affected Fedora systems. The source bundle does not prove exposure for every Chromium-derived browser, so validate against vendor-specific advisories.
Exploitation context
CISA KEV status supports that this vulnerability has been exploited in the wild. The CVE description requires a crafted HTML page and user interaction, making web browsing, malicious links, and compromised sites the primary risk context. Public technical material exists, but the bundle does not establish current exploit volume.
Researcher notes
The bundle supports Chrome before 93.0.4577.82, CWE-787, V8 heap corruption via crafted HTML, CVSS 8.8, and KEV inclusion. It does not provide complete bug details from crbug, current exploitation metrics, or evidence for products beyond Chrome and referenced Fedora packages.
Mitigation direction
- Update Google Chrome to 93.0.4577.82 or later.
- Apply Fedora browser package updates where those advisories are relevant.
- Prioritize managed browser patch compliance on user workstations.
- Check vendor guidance for unsupported or legacy browser deployments.
Validation and detection
- Inventory Chrome versions across managed endpoints.
- Flag any Chrome version older than 93.0.4577.82.
- Check Linux package versions against applicable Fedora advisories.
- Confirm browser update policy enforcement and successful rollout telemetry.
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.
CWE-787: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-30632 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
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://chromereleases.googleblog.com/2021/09/stable-channel-update-for-desktop.htmlCVE reference
- https://crbug.com/1247763CVE reference
- FEDORA-2021-ab09a05562CVE reference · vendor-advisory
- FEDORA-2021-591b3a2af0CVE reference · vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30632CVE reference · government-resource
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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.