Security readout for executives and security teams
CVE-2021-21148 is a serious Chrome browser flaw in V8, Chrome's JavaScript engine. A malicious web page could corrupt browser memory if a user visited it. CISA lists this CVE as known exploited, so old Chrome installations should be treated as an urgent endpoint risk. Exposure is most likely on endpoints running Google Chrome versions earlier than 88.0.4324.150. Linux distribution Chromium packages may also require attention where referenced by Fedora, Debian, or Gentoo advisories. Treat as high priority because it affects a widely deployed browser and is listed in CISA KEV. The main business risk is endpoint compromise through web browsing on unpatched systems. Mitigation focus: Upgrade Google Chrome to 88.0.4324.150 or later.; Apply relevant Fedora, Debian, or Gentoo browser package updates where applicable.; Use enterprise browser management to enforce minimum approved versions..
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
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2021-21148 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://crbug.com/1170176CVE reference · x_refsource_MISC
- https://chromereleases.googleblog.com/2021/02/stable-channel-update-for-desktop_4.htmlCVE reference · x_refsource_MISC
- FEDORA-2021-05afa65d39CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-7fb30b9381CVE reference · vendor-advisory, x_refsource_FEDORA
- DSA-4858CVE reference · vendor-advisory, x_refsource_DEBIAN
- GLSA-202104-08CVE reference · vendor-advisory, x_refsource_GENTOO
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21148CVE 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.