CVE-2020-15999 is a medium-severity out-of-bounds write vulnerability in CefSharp.Common (nuget), affecting versions < 85.3.130. It is fixed in 85.3.130.
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
A write operation targets a memory location beyond the intended buffer boundary. Typical impact: memory corruption, crash, or arbitrary code execution.
CVE-2020-15999 has a CVSS score of 6.5 (Medium). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment.
A fixed version is available (85.3.130). Upgrading removes the vulnerable code path.
nuget
CefSharp.Common (< 85.3.130)CefSharp.Wpf (< 85.3.130)CefSharp.WinForms (< 85.3.130)CefSharp.Wpf.HwndHost (< 85.3.130)CefSharp.Common → 85.3.130 (nuget)CefSharp.Wpf → 85.3.130 (nuget)CefSharp.WinForms → 85.3.130 (nuget)CefSharp.Wpf.HwndHost → 85.3.130 (nuget)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter instead of chasing every advisory.
Kodem's runtime-powered SCA identifies whether CVE-2020-15999 is reachable in your applications. Explore open-source security for your team.
See if CVE-2020-15999 is reachable in your applications. Get a demo
Already deployed Kodem? See CVE-2020-15999 in your environment →Upgrade the following packages to resolve this vulnerability:
CefSharp.Common to 85.3.130 or laterCefSharp.Wpf to 85.3.130 or laterCefSharp.WinForms to 85.3.130 or laterCefSharp.Wpf.HwndHost to 85.3.130 or laterKodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
CVE-2020-15999 is a medium-severity out-of-bounds write vulnerability in CefSharp.Common (nuget), affecting versions < 85.3.130. It is fixed in 85.3.130. A write operation targets a memory location beyond the intended buffer boundary.
CVE-2020-15999 has a CVSS score of 6.5 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
CefSharp.Common (nuget) (versions < 85.3.130)CefSharp.Wpf (nuget) (versions < 85.3.130)CefSharp.WinForms (nuget) (versions < 85.3.130)CefSharp.Wpf.HwndHost (nuget) (versions < 85.3.130)Yes. CVE-2020-15999 is fixed in 85.3.130. Upgrade to this version or later.
Whether CVE-2020-15999 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
CefSharp.Common to 85.3.130 or laterCefSharp.Wpf to 85.3.130 or laterCefSharp.WinForms to 85.3.130 or laterCefSharp.Wpf.HwndHost to 85.3.130 or later