X Server vulnerabilitiesRanked by how likely they are to be used.

Product280 versions
The short answer

X Server is made by X.org. We track 82 published vulnerabilities in it, across 280 versions. None of them is on the list of flaws known to be exploited today. If you run X Server, keep it on a version the vendor still supports.

See the riskiest flaws

We keep watching the known-exploited list.

Known exploited

Which X Server vulnerabilities are being exploited?

This is the list that matters most: flaws criminals are using now.

None of X Server's published vulnerabilities is on the list of flaws known to be exploited today. We keep watching that list.

Exploit likelihood

Which X Server flaws are most likely to be used?

Ranked by the latest exploit-likelihood forecast: the chance each flaw is used in an attack in the next 30 days. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.

50% or more10% to 49%Under 10%
  1. 27%

    A flaw was found in xorg-x11-server before 1.20.3.

    CVSS6.6Published25 Oct 2018
  2. 5.2%

    The GLX extension in XFree86 4.0, X.Org X Window System (aka X11 or X) X11R6.7, and X.Org Server (aka xserver and xorg-server) before 1.16.3 allows remote authenticated users to cause a denial of service...

    CVSS6.5Published10 Dec 2014
  3. 4.6%

    The SProcXCMiscGetXIDList function in the XC-MISC extension in X.Org X Window System (aka X11 or X) X11R6.0 and X.Org Server (aka xserver and xorg-server) before 1.16.3 allows remote authenticated users to cause a...

    CVSS6.5Published10 Dec 2014
  4. 4.5%

    X.Org Server (aka xserver and xorg-server) before 1.16.3 and 1.17.x before 1.17.1 allows remote attackers to obtain sensitive information from process memory or cause a denial of service (crash) via a crafted string...

    CVSS6.4Published13 Feb 2015
  5. 4.5%

    xorg-x11-server before 1.19.5 was missing length validation in XFree86 VidModeExtension allowing malicious X client to cause X server to crash or possibly execute arbitrary code.

    CVSS9.8Published24 Jan 2018
  6. 4.5%

    xorg-x11-server before 1.19.5 was missing length validation in XFIXES extension allowing malicious X client to cause X server to crash or possibly execute arbitrary code.

    CVSS9.8Published24 Jan 2018
  7. 4.4%

    The XInput extension in X.Org X Window System (aka X11 or X) X11R4 and X.Org Server (aka xserver and xorg-server) before 1.16.3 allows remote authenticated users to cause a denial of service (out-of-bounds read or...

    CVSS6.5Published10 Dec 2014
  8. 4.4%

    xorg-x11-server before 1.19.5 had wrong extra length check in ProcXIChangeHierarchy function allowing malicious X client to cause X server to crash or possibly execute arbitrary code.

    CVSS9.8Published24 Jan 2018
  9. 4.4%

    The SProcXFixesSelectSelectionInput function in the XFixes extension in X.Org X Window System (aka X11 or X) X11R6.8.0 and X.Org Server (aka xserver and xorg-server) before 1.16.3 allows remote authenticated users to...

    CVSS6.5Published10 Dec 2014
  10. 4.4%

    Multiple integer overflows in the GLX extension in XFree86 4.0, X.Org X Window System (aka X11 or X) X11R6.7, and X.Org Server (aka xserver and xorg-server) before 1.16.3 allow remote authenticated users to cause a...

    CVSS6.5Published10 Dec 2014
Precursor Intelligence

Running X Server? We'll keep checking.

Looking flaws up one at a time doesn't scale. Tell us what you run once, and we tell you which flaws matter to you, in what order, and keep watching for new ones.

  1. Tell us what you runPick your software from a list, or let us work it out from your website.
  2. We match it to every flawOver 400,000 published flaws, checked against your list.
  3. Ranked by real-world riskA 0 to 100 score, led by evidence criminals are using it.
  4. Told as soon as we knowAn alert by email, in the app or by webhook to your own tools.

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FAQ

Common questions, answered plainly.

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We track 82 published vulnerabilities listed under the name X Server, across 280 versions.

None of X Server's vulnerabilities is on the list of flaws known to be exploited today.

Create a Precursor Intelligence account and track X Server. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook.