Known exploited vulnerability
CVE-2021-37973
The short answer
CVE-2021-37973 affects Google Chrome and is rated critical (CVSS 9.6). CISA added it to the Known Exploited Vulnerabilities catalog on 2021-11-03: attackers are using it, so patch it first. The vendor has linked a patch.
What it is
Use after free in Portals in Google Chrome prior to 94.0.4606.61 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.
Weakness: CWE-416.
Severity
9.6 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Nov 3, 2021
Federal due date Nov 17, 2021
EPSS, next 30 days
12%
Higher than 96% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply updates per vendor instructions.
Affected products
Chrome. NVD's record lists the exact affected versions.
References
- chromereleases.googleblog.com/2021/09/stable-channel-update-for-desktop_24.html Release Notes
- crbug.com/1251727 Issue TrackingPatchVendor Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4DDW7HAHTS3SDVXBQUY4SURELO5D4X7R/ Release Notes
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PM7MOYYHJSWLIFZ4TPJTD7MSA3HSSLV2/ Release Notes
- www.debian.org/security/2022/dsa-5046 Mailing ListThird Party Advisory
- chromereleases.googleblog.com/2021/09/stable-channel-update-for-desktop_24.html Release Notes
- crbug.com/1251727 Issue TrackingPatchVendor Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4DDW7HAHTS3SDVXBQUY4SURELO5D4X7R/ Release Notes
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PM7MOYYHJSWLIFZ4TPJTD7MSA3HSSLV2/ Release Notes
- www.debian.org/security/2022/dsa-5046 Mailing ListThird Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-37973 US Government Resource
Questions
Is CVE-2021-37973 being exploited?
Yes. CISA added CVE-2021-37973 to its Known Exploited Vulnerabilities catalog on 2021-11-03, with a federal remediation due date of 2021-11-17.
How do I fix CVE-2021-37973?
CISA's required action: Apply updates per vendor instructions.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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