Heap buffer overflow in CefSharp
CISA confirms exploitation of this vulnerability in real attacks. Prioritise checking whether your application is affected. CISA KEV · CC0 1.0
Impact
A memory corruption bug(Heap overflow) in the FreeType font rendering library.
This can be exploited by attackers to execute arbitrary code by using specially crafted fonts with embedded PNG images .
As per https://www.secpod.com/blog/chrome-zero-day-under-active-exploitation-patch-now/
Google is aware of reports that an exploit for CVE-2020-15999 exists in the wild.
Patches
Upgrade to 85.3.130 or higher
References
- https://www.secpod.com/blog/chrome-zero-day-under-active-exploitation-patch-now/
- https://www.zdnet.com/article/google-releases-chrome-security-update-to-patch-actively-exploited-zero-day/
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15999
- https://magpcss.org/ceforum/viewtopic.php?f=10&t=17942
To review the CEF/Chromium patch see https://bitbucket.org/chromiumembedded/cef/commits/cd6cbe008b127990036945fb75e7c2c1594ab10d
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | CefSharp.Common | < 85.3.130 | 85.3.130 |
| .NET (NuGet) | CefSharp.WinForms | < 85.3.130 | 85.3.130 |
| .NET (NuGet) | CefSharp.Wpf | < 85.3.130 | 85.3.130 |
| .NET (NuGet) | CefSharp.Wpf.HwndHost | < 85.3.130 | 85.3.130 |
References
- https://github.com/cefsharp/CefSharp/security/advisories/GHSA-pv36-h7jh-qm62
- https://nvd.nist.gov/vuln/detail/CVE-2020-15999
- https://www.nuget.org/packages/CefSharp.Wpf.HwndHost
- https://www.nuget.org/packages/CefSharp.Wpf
- https://www.nuget.org/packages/CefSharp.WinForms
- https://www.nuget.org/packages/CefSharp.Common
- https://www.debian.org/security/2021/dsa-4824
- https://security.netapp.com/advisory/ntap-20240812-0001
- https://security.gentoo.org/glsa/202401-19
- https://security.gentoo.org/glsa/202012-04
- https://security.gentoo.org/glsa/202011-12
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J3QVIGAAJ4D62YEJAJJWMCCBCOQ6TVL7
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J3QVIGAAJ4D62YEJAJJWMCCBCOQ6TVL7
- https://googleprojectzero.blogspot.com/p/rca-cve-2020-15999.html
- https://github.com/cefsharp/CefSharp
- https://crbug.com/1139963
- https://chromereleases.googleblog.com/2020/10/stable-channel-update-for-desktop_20.html
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00016.html
- http://seclists.org/fulldisclosure/2020/Nov/33
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-119, CWE-787- Platform
- .NET (NuGet)
- Package
CefSharp.Common, CefSharp.WinForms, CefSharp.Wpf- Disclosed
- 27.10.2020
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-pv36-h7jh-qm62 - CC BY 4.0
Vulnerability history: CefSharp.Wpf
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 10.2020 04.2025
- Without a fix
- 0
- Exploited in attacks
- 5
Severity breakdown
- High 5
- Medium 1
Disclosures per year
- 2020: 4
- 2021: 0
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 1
- 2026: 0
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