Known exploited vulnerability
CVE-2020-16017
The short answer
CVE-2020-16017 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. Fixed versions are published for CefSharp.Common (86.0.241) and CefSharp.Wpf (86.0.241).
What it is
Use after free in site isolation in Google Chrome prior to 86.0.4240.198 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 May 3, 2022
EPSS, next 30 days
2.7%
Higher than 86% 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 packages and fixed versions
| Package | Ecosystem | Fixed in | Advisory |
|---|---|---|---|
| CefSharp.Common | NuGet | 86.0.241 | GHSA-gvqv-779r-4jgp |
| CefSharp.Wpf | NuGet | 86.0.241 | GHSA-gvqv-779r-4jgp |
| CefSharp.WinForms | NuGet | 86.0.241 | GHSA-gvqv-779r-4jgp |
| CefSharp.Wpf.HwndHost | NuGet | 86.0.241 | GHSA-gvqv-779r-4jgp |
Is it in your code? Drop your lockfile into the free vulnerability check, or let vulnerability watch check your repository every day and open the upgrade as a pull request.
Affected products
Chrome. NVD's record lists the exact affected versions.
References
- chromereleases.googleblog.com/2020/11/stable-channel-update-for-desktop_11.html Release NotesVendor Advisory
- crbug.com/1146709 Permissions RequiredVendor Advisory
- chromereleases.googleblog.com/2020/11/stable-channel-update-for-desktop_11.html Release NotesVendor Advisory
- crbug.com/1146709 Permissions RequiredVendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-16017 US Government Resource
Questions
Is CVE-2020-16017 being exploited?
Yes. CISA added CVE-2020-16017 to its Known Exploited Vulnerabilities catalog on 2021-11-03, with a federal remediation due date of 2022-05-03.
How do I fix CVE-2020-16017?
Upgrade to a fixed version: CefSharp.Common (NuGet) 86.0.241; CefSharp.Wpf (NuGet) 86.0.241; CefSharp.WinForms (NuGet) 86.0.241; CefSharp.Wpf.HwndHost (NuGet) 86.0.241. 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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