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ExploitedIn CISA KEVFix available

CVE-2021-30533

Exploitation confirmed. First attested on 2022-06-27 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2021-06-07
  • WeaknessCWE-863

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 policy enforcement in PopupBlocker in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass navigation restrictions via a crafted iframe.

Timeline

dates in UTC
  1. 2021-06-0720:15CVE publishedNVD
  2. 2022-06-27Added to the CISA KEV catalogCISA KEV
  3. 2022-06-27Listed as exploited by GCVEGCVE
  4. 2022-06-27Exploitation first reportedCISA KEV
  5. 2025-02-0415:04SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 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-2021-30533?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-30533?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
33.x= 33no fix published
34.x= 34no fix published
Google chrome
BranchAffectedFixed in
91.0< 91.0.4472.7791.0.4472.77

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
    • < 91.0.4472.77fixed in 91.0.4472.77custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2021-07-18

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 SP3all versions · fixed in 91.0.4472.77-bp153.2.3.1
  • chromiumopenSUSE:Tumbleweedall versions · fixed in 93.0.4577.82-1.1
  • chromiumopenSUSE:Tumbleweedall versions · fixed in 113.0.5672.92-1.1
  • chromiumopenSUSE:Leap 15.3all versions · fixed in 91.0.4472.77-bp153.2.3.1
  • chromiumopenSUSE:Leap 15.2all versions · fixed in 91.0.4472.77-lp152.2.98.1
  • chromiumDebian:14all versions · fixed in 93.0.4577.82-1
  • chromiumDebian:13all versions · fixed in 93.0.4577.82-1
  • chromiumDebian:12all versions · fixed in 93.0.4577.82-1

24 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-30533 Red Hat Product Security

    chromium-browser: Insufficient policy enforcement in PopupBlocker

Full record on NVD

Fix

  1. CISA’s required action: Apply updates per vendor instructions.due 2022-07-18

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-06-27
Patch Due Date
2022-07-18
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:N/I:H/A:N
Published
2021-06-07
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-83cg-29pr-h246

Frequently asked questions

What is CVE-2021-30533?

Insufficient policy enforcement in PopupBlocker in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass navigation restrictions via a crafted iframe.

Is CVE-2021-30533 actively exploited?

Yes. CVE-2021-30533 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 2022-07-18.

What is the CVSS score for CVE-2021-30533?

CVE-2021-30533 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

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Sources for this record