How severe is GHSA-x7fx-mcc9-27j7?

No CVSS score has been assigned to GHSA-x7fx-mcc9-27j7 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-x7fx-mcc9-27j7?

GHSA-x7fx-mcc9-27j7 affects the following packages: CefSharp.Common (NuGet), CefSharp.Wpf (NuGet), CefSharp.WinForms (NuGet), CefSharp.Wpf.HwndHost (NuGet). Ecosystems affected: NuGet.

How do I fix GHSA-x7fx-mcc9-27j7?

Update CefSharp.Common to version 86.0.241 or later. Run your dependency manager's update command and verify no transitive dependencies pin the vulnerable version. Use O3 Security's SCA scanner to confirm the fix is applied across your entire dependency tree.

Is GHSA-x7fx-mcc9-27j7 actively exploited in the wild?

Yes. There are 3 known exploit references for GHSA-x7fx-mcc9-27j7, including 3 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for GHSA-x7fx-mcc9-27j7?

GHSA-x7fx-mcc9-27j7 has an EPSS (Exploit Prediction Scoring System) score of 26.1%, placing it in the 96th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score warrants monitoring and prompt remediation.

Is GHSA-x7fx-mcc9-27j7 in the CISA Known Exploited Vulnerabilities catalog?

Yes. GHSA-x7fx-mcc9-27j7 (Google Chromium V8 Incorrect Implementation Vulnerabililty) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-05-03. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is GHSA-x7fx-mcc9-27j7?

GHSA-x7fx-mcc9-27j7 is classified as Out-of-bounds Write (CWE-787). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-x7fx-mcc9-27j7 published, and has it been updated?

GHSA-x7fx-mcc9-27j7 was published on November 27, 2020 and was last updated on December 2, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2021-11-03 — agencies required to remediate by 2022-05-03

.NET NuGet

GHSA-x7fx-mcc9-27j7

Inappropriate implementation in V8 in CefSharp

Also known asCVE-2020-16013

Published

Nov 27, 2020

Updated

Dec 2, 2024

Affected

4 pkgs

Patched

4 / 4

Exploits

3 known

EPSS Exploitation Probability

via FIRST.org ↗

26.1%probability of exploitation in next 30 days

Moderate Risk96th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

4 pkgs affected

.NETCefSharp.Common.NETCefSharp.Wpf.NETCefSharp.WinForms.NETCefSharp.Wpf.HwndHost

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.

Description

High CVE-2020-16013: Inappropriate implementation in V8.

Google is aware of reports that exploits for CVE-2020-16013 and CVE-2020-16017 exist in the wild.

There is currently little to no public information on the issue other than it has been flagged as High severity.

Affected Packages

4 total 4 fixed

Ecosystem	Package	Vulnerable range	Fix
.NETNuGet	`CefSharp.Common`	all versions	86.0.241
.NETNuGet	`CefSharp.Wpf`	all versions	86.0.241
.NETNuGet	`CefSharp.WinForms`	all versions	86.0.241
.NETNuGet	`CefSharp.Wpf.HwndHost`	all versions	86.0.241

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Inappropriate implementation in V8 in Google Chrome prior to 86.0.4240.1…

chromereleases.googleblog.comChromeNov 2020

Inappropriate implementation in V8 in Google Chrome prior to 86.0.4240.1…

chromereleases.googleblog.comGoogle-sheetNov 2020

Inappropriate implementation in V8 in Google Chrome prior to 86.0.4240.1…

cisa.govCISAJul 2021

Frequently Asked Questions

High CVE-2020-16013: Inappropriate implementation in V8. - https://chromereleases.googleblog.com/2020/11/stable-channel-update-for-desktop_11.html - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-16013 Google is aware of reports that exploits for CVE-2020-16013 and CVE-2020-16017 exist in the wild. There is currently little to no public information on the issue other than it has been flagged as `High` severity.

O3 Security · Impact-Aware SCA

Is GHSA-x7fx-mcc9-27j7 in your stack?

O3 detects GHSA-x7fx-mcc9-27j7 across NuGet dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works