Is CVE-2020-16017 exploited in the wild?

Yes. CVE-2020-16017 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

How severe is CVE-2020-16017?

Critical severity, with a CVSS score of 9.6, published 27 November 2020.

Which products and versions are affected?

CefSharp.Common (NuGet) ECOSYSTEM:introduced=0,fixed=86.0.241; CefSharp.WinForms (NuGet) ECOSYSTEM:introduced=0,fixed=86.0.241; CefSharp.Wpf (NuGet) ECOSYSTEM:introduced=0,fixed=86.0.241; CefSharp.Wpf.HwndHost (NuGet) ECOSYSTEM:introduced=0,fixed=86.0.241.

Is there a fix for CVE-2020-16017?

Yes. CefSharp.Common (NuGet): upgrade to 86.0.241 or later; CefSharp.WinForms (NuGet): upgrade to 86.0.241 or later; CefSharp.Wpf (NuGet): upgrade to 86.0.241 or later; CefSharp.Wpf.HwndHost (NuGet): upgrade to 86.0.241 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2020-16017 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2020-16017?

Check whether you run Google Chrome, CefSharp.Common (NuGet), CefSharp.WinForms (NuGet) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2020-16017: Use after free in CefSharp

CVE-2020-16017 · Severity: critical · CVSS 9.6 · Exploited in the wild · Published 2020-11-27

A use-after-free vulnerability in site isolation in Google Chrome allows a remote attacker who has already compromised the renderer process to perform a sandbox escape. Exploitation is achieved via a specially crafted HTML page and requires user interaction.

Technologies: Google Chrome, CefSharp.Common (NuGet), CefSharp.WinForms (NuGet), CefSharp.Wpf (NuGet), CefSharp.Wpf.HwndHost (NuGet). Vendors: Google, NuGet.

Quick answers

Is CVE-2020-16017 exploited in the wild?: Yes. CVE-2020-16017 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2020-16017?: Critical severity, with a CVSS score of 9.6, published 27 November 2020.
Which products and versions are affected?: CefSharp.Common (NuGet) ECOSYSTEM:introduced=0,fixed=86.0.241; CefSharp.WinForms (NuGet) ECOSYSTEM:introduced=0,fixed=86.0.241; CefSharp.Wpf (NuGet) ECOSYSTEM:introduced=0,fixed=86.0.241; CefSharp.Wpf.HwndHost (NuGet) ECOSYSTEM:introduced=0,fixed=86.0.241.
Is there a fix for CVE-2020-16017?: Yes. CefSharp.Common (NuGet): upgrade to 86.0.241 or later; CefSharp.WinForms (NuGet): upgrade to 86.0.241 or later; CefSharp.Wpf (NuGet): upgrade to 86.0.241 or later; CefSharp.Wpf.HwndHost (NuGet): upgrade to 86.0.241 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2020-16017 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2020-16017?: Check whether you run Google Chrome, CefSharp.Common (NuGet), CefSharp.WinForms (NuGet) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

CefSharp.Common (NuGet): upgrade to 86.0.241 or later

dotnet add package CefSharp.Common --version 86.0.241

CefSharp.WinForms (NuGet): upgrade to 86.0.241 or later

dotnet add package CefSharp.WinForms --version 86.0.241

CefSharp.Wpf (NuGet): upgrade to 86.0.241 or later

dotnet add package CefSharp.Wpf --version 86.0.241

CefSharp.Wpf.HwndHost (NuGet): upgrade to 86.0.241 or later

dotnet add package CefSharp.Wpf.HwndHost --version 86.0.241

Affected products

Google Chrome < 86.0.4240.198

Identifiers

CVE-2020-16017
GHSA-gvqv-779r-4jgp

Timeline

2021-01-08: disclosed: NVD Published Date
2021-11-03: kev added: Date added to CISA Known Exploited Vulnerabilities Catalog
2021-11-03: advisory: CISA Advisory Publication

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