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CVE-2021-21206

Google Chromium Blink Use-After-Free

8.8 HIGHActively exploited (CISA KEV)EPSS 9.31%
  1. Published26 Apr 2021
  2. Added to CISA KEV3 Nov 2021
  3. Remediation due17 Nov 2021
Actively exploited (CISA KEV)

Google Chromium Blink contains a use-after-free vulnerability that allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.

Added to KEV: 3 Nov 2021Federal remediation due: 17 Nov 2021

Description

Use after free in Blink in Google Chrome prior to 89.0.4389.128 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Google Chrome< 89.0.4389.128
Fedoraproject Fedora32 · 33 · 34

Remediation

Fixed in
Google Chrome≥ 89.0.4389.128

References

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Frequently asked

Is CVE-2021-21206 being actively exploited?

Yes. CVE-2021-21206 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Nov 2021.

How severe is CVE-2021-21206?

CVE-2021-21206 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 9.31% probability of exploitation.

Which products are affected by CVE-2021-21206?

Affected products include Google Chrome, Fedoraproject Fedora.

How do I fix CVE-2021-21206?

Upgrade affected software to a fixed version, for example Google Chrome 89.0.4389.128 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-21206 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.