UBUNTU-CVE-2021-20220

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    UBUNTU-CVE-2021-20220

    Published: 23 Feb 2021Last Modified: 17 Oct 2026
    Upstream:
    CVE-2021-20220

    Summary:

    Details: A flaw was found in Undertow. A regression in the fix for CVE-2020-10687 was found. HTTP request smuggling related to CVE-2017-2666 is possible against HTTP/1.x and HTTP/2 due to permitting invalid characters in an HTTP request. This flaw allows an attacker to poison a web-cache, perform an XSS attack, or obtain sensitive information from request other than their own. The highest threat from this vulnerability is to data confidentiality and integrity.

    References: https://ubuntu.com/security/CVE-2021-20220, https://bugzilla.redhat.com/show_bug.cgi?id=1923133, https://www.cve.org/CVERecord?id=CVE-2021-20220

    Affected packages

    Package

    Name: undertow

    Purl: pkg:deb/ubuntu/undertow?arch=source&distro=esm-apps%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.3.4-1
    1.3.5-1
    1.3.7-1
    1.3.11-1
    1.3.16-1
    1.3.16-1ubuntu0.1~esm1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2021-20220 | CVE-DB