ALSA-2021:2259

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    ALSA-2021:2259

    Published: 7 Jun 2021Last Modified: 4 Feb 2026

    Summary: Important: nginx:1.18 security update

    Details: nginx is a web and proxy server supporting HTTP and other protocols, with a focus on high concurrency, performance, and low memory usage. Security Fix(es): * nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name (CVE-2021-23017) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

    References: https://errata.almalinux.org/8/ALSA-2021-2259.html, https://vulners.com/cve/CVE-2021-23017

    Affected packages

    Package

    Name: nginx

    Purl: pkg:rpm/almalinux/nginx

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1:1.18.0-3.module_el8.5.0+36+48437aab.1.alma

    Affected versions

    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
    ALSA-2021:2259 | CVE-DB