QID 352488

Date Published: 2021-07-21

QID 352488: Amazon Linux Security Advisory for libX11: ALAS2-2021-1686

A missing validation flaw was found in libx11.
This flaw allows an attacker to inject x11 protocol commands on x clients, and in some cases, also bypass, authenticate (via injection of control characters), or potentially execute arbitrary code with permissions of the application compiled with libx11.
The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability. (
( CVE-2021-31535)



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Allows unauthorized disclosure of information; allows unauthorized modification; allows disruption of service.

  • CVSS V3 rated as Critical - 9.8 severity.
  • CVSS V2 rated as High - 7.5 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2-2021-1686 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 352488

    CVE-2021-31535 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2-2021-1686 Amazon Linux 2 URL Logo alas.aws.amazon.com/AL2/ALAS-2021-1686.html
    By selecting these links, you may be leaving CVEreport webspace. We have provided these links to other websites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other websites that are more appropriate for your purpose. CVEreport does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, CVEreport does not endorse any commercial products that may be mentioned on these sites. Please address comments about any linked pages to [email protected].