CVE-2020-15999: CefSharp.Common Heap Buffer Overflow Vulnerability

Q: What is CVE-2020-15999?

CVE-2020-15999 is a security vulnerability in CefSharp.Common involving Heap buffer overflow in CefSharp under CWE-787: Out-of-bounds Write.

Q: Which CefSharp.Common versions are affected?

Affected versions include releases prior to 85.3.130 across affected packages: CefSharp.Common, CefSharp.Wpf, CefSharp.WinForms, CefSharp.Wpf.HwndHost.

Q: What version fixes CVE-2020-15999?

Upgrading to 85.3.130 (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is CefSharp.Common affected?

Yes, CefSharp.Common is affected in releases prior to 85.3.130. Upgrade your dependency to 85.3.130 or later.

Q: Is CefSharp.Wpf affected?

Yes, CefSharp.Wpf is affected in releases prior to 85.3.130. Upgrade your dependency to 85.3.130 or later.

Q: What is the CVSS score of CVE-2020-15999?

CVE-2020-15999 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Q: What CWE is associated with CVE-2020-15999?

CVE-2020-15999 is classified under CWE-787: Out-of-bounds Write (The product writes data past the end, or before the beginning, of the intended buffer.).

Q: How can I check NuGet dependencies for CVE-2020-15999?

Run the dependency tree command: 'inspect dependencies for CefSharp.Common'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

MODERATE

Advisory Identifier: GHSA-pv36-h7jh-qm62

CVSS 6.5

CWE-787 CWE-119

Published 2020-10-27

Advisory Summary

CVE-2020-15999 is a MODERATE (CVSS 6.5) heap buffer overflow vulnerability (CWE-787: Out-of-bounds Write) affecting CefSharp.Common libraries in the NuGet ecosystem. The issue involves heap buffer overflow in cefsharp. Remediation is available by upgrading affected packages to version 85.3.130.

CVE-2020-15999 at a Glance

CVE Identifier CVE-2020-15999

GHSA Identifier GHSA-pv36-h7jh-qm62

Severity MODERATE

CVSS v3.1 Base Score 6.5

CWE Classification CWE-787: Out-of-bounds Write

Affected Product CefSharp.Common

Package Ecosystem NuGet

Published Date 2020-10-27

Last Updated 2025-02-03

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required None (PR:N)

User Interaction Required (UI:R)

Scope Unchanged (S:U)

Confidentiality None (C:N)

Integrity None (I:N)

Availability High (A:H)

How to Fix CVE-2020-15999

To remediate this vulnerability, upgrade all affected CefSharp.Common dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

CefSharp.Common fixed: 85.3.130

Upgrade CefSharp.Common to 85.3.130

CefSharp.Wpf fixed: 85.3.130

Upgrade CefSharp.Wpf to 85.3.130

CefSharp.WinForms fixed: 85.3.130

Upgrade CefSharp.WinForms to 85.3.130

CefSharp.Wpf.HwndHost fixed: 85.3.130

Upgrade CefSharp.Wpf.HwndHost to 85.3.130

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

inspect dependencies for CefSharp.Common

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-15999, inspect your project dependencies for CefSharp.Common:

inspect dependencies for CefSharp.Common

Analyze the terminal output to locate any version of CefSharp.Common in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 85.3.130), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-787: Out-of-bounds Write, where the product writes data past the end, or before the beginning, of the intended buffer. In CefSharp.Common, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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

CVE-2020-15999 Affected CefSharp.Common Versions

4 component(s)

Fixed Versions:

85.3.130

Product / Package	Ecosystem	Affected Versions	Fixed Version
CefSharp.Common nuget/CefSharp.Common	NuGet	< 85.3.130	85.3.130
CefSharp.Wpf nuget/CefSharp.Wpf	NuGet	< 85.3.130	85.3.130
CefSharp.WinForms nuget/CefSharp.WinForms	NuGet	< 85.3.130	85.3.130
CefSharp.Wpf.HwndHost nuget/CefSharp.Wpf.HwndHost	NuGet	< 85.3.130	85.3.130

References

CefSharp.Common Security Information SECURITY

https://security.gentoo.org/glsa/202012-04

CefSharp.Common Security Information SECURITY

https://security.gentoo.org/glsa/202011-12

lists.fedoraproject.org/archives/list/packa... WEB

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J3QVIGAAJ4D62YEJAJJWMCCBCOQ6TVL7

lists.fedoraproject.org/archives/list/packa... WEB

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J3QVIGAAJ4D62YEJAJJWMCCBCOQ6TVL7

googleprojectzero.blogspot.com/p/rca-cve-2020-1599... WEB

https://googleprojectzero.blogspot.com/p/rca-cve-2020-15999.html

GitHub Advisory / Wiki ADVISORY

https://github.com/cefsharp/CefSharp/security/advisories/GHSA-pv36-h7jh-qm62

NVD — CVE-2020-15999 NVD

https://nvd.nist.gov/vuln/detail/CVE-2020-15999

www.nuget.org/packages/cefsharp.w... WEB

https://www.nuget.org/packages/CefSharp.Wpf.HwndHost

www.nuget.org/packages/cefsharp.w... WEB

https://www.nuget.org/packages/CefSharp.Wpf

www.nuget.org/packages/cefsharp.w... WEB

https://www.nuget.org/packages/CefSharp.WinForms

www.nuget.org/packages/cefsharp.c... WEB

https://www.nuget.org/packages/CefSharp.Common

CefSharp.Common Security Information SECURITY

https://www.debian.org/security/2021/dsa-4824

CefSharp.Common Security Information SECURITY

https://security.netapp.com/advisory/ntap-20240812-0001

CefSharp.Common Security Information SECURITY

https://security.gentoo.org/glsa/202401-19

CefSharp.Common Source Repository REPOSITORY

https://github.com/cefsharp/CefSharp

crbug.com/1139963 WEB

https://crbug.com/1139963

chromereleases.googleblog.com/2020/10/stable-chan... WEB

https://chromereleases.googleblog.com/2020/10/stable-channel-update-for-desktop_20.html

CefSharp.Common Security Information SECURITY

http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00016.html

seclists.org/fulldisclosure/2020... WEB

http://seclists.org/fulldisclosure/2020/Nov/33

Frequently Asked Questions

What is CVE-2020-15999?

CVE-2020-15999 is a security vulnerability in CefSharp.Common involving Heap buffer overflow in CefSharp under CWE-787: Out-of-bounds Write.

Which CefSharp.Common versions are affected?

Affected versions include releases prior to 85.3.130 across affected packages: CefSharp.Common, CefSharp.Wpf, CefSharp.WinForms, CefSharp.Wpf.HwndHost.

What version fixes CVE-2020-15999?

Upgrading to 85.3.130 (or the latest patched release for your respective branch) resolves the vulnerability.

Is CefSharp.Common affected?

Yes, CefSharp.Common is affected in releases prior to 85.3.130. Upgrade your dependency to 85.3.130 or later.

Is CefSharp.Wpf affected?

Yes, CefSharp.Wpf is affected in releases prior to 85.3.130. Upgrade your dependency to 85.3.130 or later.

What is the CVSS score of CVE-2020-15999?

CVE-2020-15999 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

What CWE is associated with CVE-2020-15999?

CVE-2020-15999 is classified under CWE-787: Out-of-bounds Write (The product writes data past the end, or before the beginning, of the intended buffer.).

How can I check NuGet dependencies for CVE-2020-15999?

Run the dependency tree command: 'inspect dependencies for CefSharp.Common'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

Machine-readable OSV JSON OSV v1.5 Schema

Normalized schema output

View Raw JSON

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  "id" : "GHSA-pv36-h7jh-qm62",
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  "published" : "2020-10-27T19:47:38Z",
  "aliases" : [ "CVE-2020-15999" ],
  "summary" : "Heap buffer overflow in CefSharp",
  "details" : "### Impact\nA memory corruption bug(Heap overflow) in the FreeType font rendering library.\n\n> This can be exploited by attackers to execute arbitrary code by using specially crafted fonts with embedded PNG images .\n\nAs per https://www.secpod.com/blog/chrome-zero-day-under-active-exploitation-patch-now/ \n\nGoogle is aware of reports that an exploit for CVE-2020-15999 exists in the wild.\n\n### Patches\nUpgrade to 85.3.130 or higher\n\n### References\n- https://www.secpod.com/blog/chrome-zero-day-under-active-exploitation-patch-now/\n- https://www.zdnet.com/article/google-releases-chrome-security-update-to-patch-actively-exploited-zero-day/\n- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15999\n- https://magpcss.org/ceforum/viewtopic.php?f=10&t=17942\n\nTo review the `CEF/Chromium` patch see https://bitbucket.org/chromiumembedded/cef/commits/cd6cbe008b127990036945fb75e7c2c1594ab10d",
  "severity" : [ {
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  }, {
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}

CVSS V3

6.5 MODERATE

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required None (PR:N)

User Interaction Required (UI:R)

Scope Unchanged (S:U)

Confidentiality None (C:N)

Integrity None (I:N)

Availability High (A:H)

Vector String

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Advisory Metadata

Source ID: GHSA-pv36-h7jh-qm62
Schema Version: 1.4.0
Published: 2020-10-27 19:47
Last Modified: 2025-02-03 15:31
Database Record File: advisories/github-reviewed/2020/10/GHSA-pv36-h7jh-qm62/GHSA-pv36-h7jh-qm62.json