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Exploited vulnerability · CISA KEV

Is CVE-2021-30533 exploited? Yes: in CISA KEV since 27 Jun 2022

Gociux · Google Chromium PopupBlocker · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-30533, Google Chromium PopupBlocker Security Bypass Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 27 Jun 2022, 385 days after it was published. It affects Google Chromium PopupBlocker. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 27 Jun 2022
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity6.5CVSS 3.1 · medium
US federal due18 Jul 2022BOD 22-01 deadline

What it is

Google Chromium PopupBlocker contains an insufficient policy enforcement vulnerability that allows a remote attacker to bypass navigation restrictions via a crafted iframe. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.

VendorGoogle (77 exploited CVEs in KEV)
ProductChromium PopupBlocker
VulnerabilityGoogle Chromium PopupBlocker Security Bypass Vulnerability
WeaknessCWE-863
Published7 Jun 2021
Added to KEV27 Jun 2022
Reported by (CNA)Chrome

What to do

  1. Check whether you run it. Look for Chromium PopupBlocker in your asset inventory, including appliances and cloud images. Stack check lists every exploited Google CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 7 Jun 2021.
  4. Get told next time. Email alerts when CISA adds a CVE for Google.

References

Questions

Is CVE-2021-30533 being exploited?

Yes. CISA added CVE-2021-30533 to the Known Exploited Vulnerabilities catalog on 27 Jun 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-30533 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2021-30533?

Apply updates per vendor instructions. Check Google's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Chromium PopupBlocker and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in June 2022 · Google scorecard · act-now radar.

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