UBUNTU-CVE-2021-41099

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    UBUNTU-CVE-2021-41099

    Published: 4 Oct 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-41099
    Aliases:
    USN-5221-1

    Summary:

    Details: Redis is an open source, in-memory database that persists on disk. An integer overflow bug in the underlying string library can be used to corrupt the heap and potentially result with denial of service or remote code execution. The vulnerability involves changing the default proto-max-bulk-len configuration parameter to a very large value and constructing specially crafted network payloads or commands. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14. An additional workaround to mitigate the problem without patching the redis-server executable is to prevent users from modifying the proto-max-bulk-len configuration parameter. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.

    References: https://ubuntu.com/security/CVE-2021-41099, https://github.com/redis/redis/security/advisories/GHSA-j3cr-9h5g-6cph, https://ubuntu.com/security/notices/USN-5221-1, https://www.cve.org/CVERecord?id=CVE-2021-41099

    Affected packages

    Package

    Name: redis

    Purl: pkg:deb/ubuntu/redis@5:4.0.9-1ubuntu0.2+esm3?arch=source&distro=esm-apps/bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -5:4.0.9-1ubuntu0.2+esm3

    Affected versions

    4:4.0.1-7
    4:4.0.2-6
    4:4.0.2-9

    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-2021-41099 | CVE-DB