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ExploitedIn CISA KEVFix available

CVE-2021-21220

Exploitation confirmed. First attested on 2021-11-03 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2021-04-26
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Insufficient validation of untrusted input in V8 in Google Chrome prior to 89.0.4389.128 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Timeline

dates in UTC
  1. 2021-04-2617:15CVE publishedNVD
  2. 2021-11-03Added to the CISA KEV catalogCISA KEV
  3. 2021-11-03Listed as exploited by GCVEGCVE
  4. 2021-11-03Exploitation first reportedCISA KEV
  5. 2024-02-0520:46SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-21220?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-21220?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Fedoraproject fedora
BranchAffectedFixed in
32.x= 32no fix published
33.x= 33no fix published
34.x= 34no fix published
Google chrome
BranchAffectedFixed in
89.0< 89.0.4389.12889.0.4389.128

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As Chrome, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Google Chrome
    Affected
    • < 89.0.4389.128fixed in 89.0.4389.128custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2023-12-14

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • chromiumSUSE:Package Hub 15 SP2all versions · fixed in 89.0.4389.128-bp152.2.71.1
  • chromiumopenSUSE:Tumbleweedall versions · fixed in 93.0.4577.82-1.1
  • chromiumopenSUSE:Tumbleweedall versions · fixed in 113.0.5672.92-1.1
  • chromiumopenSUSE:Leap 15.2all versions · fixed in 89.0.4389.128-lp152.2.86.1
  • chromiumDebian:14all versions · fixed in 90.0.4430.72-1
  • chromiumDebian:13all versions · fixed in 90.0.4430.72-1
  • chromiumDebian:12all versions · fixed in 90.0.4430.72-1
  • chromiumCleanStartall versions · fixed in 89.0.4389.128-r0

25 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-21220 Red Hat Product Security

    chromium-browser: Insufficient validation of untrusted input in V8 for x86_64

Full record on NVD

Fix

  1. CISA’s required action: Apply updates per vendor instructions.due 2021-11-17

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
4 repositories, unverifiedAmesianX/CVE-2021-21220JacobTaylor3/CVE-2021-21220JacobTaylor3/C2-and-Post-Exploitation-Frameworkborahll/CVE-2021-21220
PoC-in-GitHub
Metasploit modules
1 moduleexploit/multi/browser/chrome_cve_2021_21220_v8_insufficient_validationrank: manualModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2021-11-03
Patch Due Date
2021-11-17
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2021-04-26
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-5cw9-vvr5-jcwf

Frequently asked questions

What is CVE-2021-21220?

Insufficient validation of untrusted input in V8 in Google Chrome prior to 89.0.4389.128 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Is CVE-2021-21220 actively exploited?

Yes. CVE-2021-21220 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2021-11-17.

What is the CVSS score for CVE-2021-21220?

CVE-2021-21220 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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Sources for this record