RLSA-2021:1853

    Dashboard / Vulnerabilities / RLSA-2021:1853

    RLSA-2021:1853

    Published: 18 May 2021Last Modified: 5 Feb 2026

    Summary: Moderate: unbound security, bug fix, and enhancement update

    Details: The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver. Security Fix(es): * unbound: integer overflow in the regional allocator via regional_alloc (CVE-2019-25032) * unbound: integer overflow in sldns_str2wire_dname_buf_origin can lead to an out-of-bounds write (CVE-2019-25034) * unbound: out-of-bounds write in sldns_bget_token_par (CVE-2019-25035) * unbound: assertion failure and denial of service in synth_cname (CVE-2019-25036) * unbound: assertion failure and denial of service in dname_pkt_copy via an invalid packet (CVE-2019-25037) * unbound: integer overflow in a size calculation in dnscrypt/dnscrypt.c (CVE-2019-25038) * unbound: integer overflow in a size calculation in respip/respip.c (CVE-2019-25039) * unbound: infinite loop via a compressed name in dname_pkt_copy (CVE-2019-25040) * unbound: assertion failure via a compressed name in dname_pkt_copy (CVE-2019-25041) * unbound: out-of-bounds write via a compressed name in rdata_copy (CVE-2019-25042) * unbound: symbolic link traversal when writing PID file (CVE-2020-28935) 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. Additional Changes: For detailed information on changes in this release, see the Rocky Linux 8.4 Release Notes linked from the References section.

    References: https://errata.rockylinux.org/RLSA-2021:1853, https://bugzilla.redhat.com/show_bug.cgi?id=1714175, https://bugzilla.redhat.com/show_bug.cgi?id=1842837, https://bugzilla.redhat.com/show_bug.cgi?id=1850460, https://bugzilla.redhat.com/show_bug.cgi?id=1878761, https://bugzilla.redhat.com/show_bug.cgi?id=1954772, https://bugzilla.redhat.com/show_bug.cgi?id=1954778, https://bugzilla.redhat.com/show_bug.cgi?id=1954780, https://bugzilla.redhat.com/show_bug.cgi?id=1954782, https://bugzilla.redhat.com/show_bug.cgi?id=1954794, https://bugzilla.redhat.com/show_bug.cgi?id=1954796, https://bugzilla.redhat.com/show_bug.cgi?id=1954797, https://bugzilla.redhat.com/show_bug.cgi?id=1954799, https://bugzilla.redhat.com/show_bug.cgi?id=1954801, https://bugzilla.redhat.com/show_bug.cgi?id=1954804

    Affected packages

    Package

    Name: unbound

    Purl: pkg:rpm/rocky-linux/unbound?distro=rocky-linux-8-4-legacy&epoch=0

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -0:1.7.3-15.el8

    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
    RLSA-2021:1853 | CVE-DB