UBUNTU-CVE-2021-20234

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    UBUNTU-CVE-2021-20234

    Published: 1 Apr 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-20234
    Aliases:
    USN-4920-1

    Summary:

    Details: An uncontrolled resource consumption (memory leak) flaw was found in the ZeroMQ client in versions before 4.3.3 in src/pipe.cpp. This issue causes a client that connects to multiple malicious or compromised servers to crash. The highest threat from this vulnerability is to system availability.

    References: https://ubuntu.com/security/CVE-2021-20234, https://github.com/zeromq/libzmq/pull/3918, https://github.com/zeromq/libzmq/security/advisories/GHSA-wfr2-29gj-5w87, https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22037, https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22123, https://ubuntu.com/security/notices/USN-4920-1, https://www.cve.org/CVERecord?id=CVE-2021-20234

    Affected packages

    Package

    Name: zeromq3

    Purl: pkg:deb/ubuntu/[email protected]+dfsg-2ubuntu0.1+esm3?arch=source&distro=trusty/esm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -4.0.4+dfsg-2ubuntu0.1+esm3

    Affected versions

    3.2.3+dfsg-2
    3.2.4+dfsg-1
    3.2.4+dfsg-2
    3.2.4+dfsg-3
    3.2.4+dfsg-4

    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