USN-5232-1

    Dashboard / Vulnerabilities / USN-5232-1

    USN-5232-1

    Published: 12 Sept 2022Last Modified: 29 Jun 2026

    Summary: fail2ban vulnerability

    Details: Jakub Żoczek discovered that certain Fail2ban actions handled whois responses in an insecure way. If Fail2ban was configured to use certain mail actions like 'mail-whois' on a target system, a remote attacker who was able to control whois responses to this target system could possibly execute arbitrary code.

    References: https://ubuntu.com/security/notices/USN-5232-1, https://ubuntu.com/security/CVE-2021-32749

    Affected packages

    Package

    Name: fail2ban

    Purl: pkg:deb/ubuntu/fail2ban?arch=source&distro=trusty%2Fesm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -0.8.11-1ubuntu0.1~esm1

    Affected versions

    0.8.10-3
    0.8.11~pre1+git29-gccd2657-1
    0.8.11-1

    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
    USN-5232-1 | CVE-DB