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OpenAdvisories
High RHSA-2021:2420 1 CVE

Red Hat Security Advisory: dhcp security update

Published Sep 13, 2024 · Updated Aug 7, 2026

Ecosystem: Red Hat

Fixed packages 12

ReleasePackageFixed in
Red Hat · RHEL 8.2 EUS rhel_eus:8.2::baseos dhcp 12:4.3.6-40.el8_2.2
Red Hat · RHEL 8.2 EUS rhel_eus:8.2::baseos dhcp-client 12:4.3.6-40.el8_2.2
Red Hat · RHEL 8.2 EUS rhel_eus:8.2::baseos dhcp-client-debuginfo 12:4.3.6-40.el8_2.2
Red Hat · RHEL 8.2 EUS rhel_eus:8.2::baseos dhcp-common 12:4.3.6-40.el8_2.2
Red Hat · RHEL 8.2 EUS rhel_eus:8.2::baseos dhcp-debuginfo 12:4.3.6-40.el8_2.2
Red Hat · RHEL 8.2 EUS rhel_eus:8.2::baseos dhcp-debugsource 12:4.3.6-40.el8_2.2
Red Hat · RHEL 8.2 EUS rhel_eus:8.2::baseos dhcp-libs 12:4.3.6-40.el8_2.2
Red Hat · RHEL 8.2 EUS rhel_eus:8.2::baseos dhcp-libs-debuginfo 12:4.3.6-40.el8_2.2
Red Hat · RHEL 8.2 EUS rhel_eus:8.2::baseos dhcp-relay 12:4.3.6-40.el8_2.2
Red Hat · RHEL 8.2 EUS rhel_eus:8.2::baseos dhcp-relay-debuginfo 12:4.3.6-40.el8_2.2
Red Hat · RHEL 8.2 EUS rhel_eus:8.2::baseos dhcp-server 12:4.3.6-40.el8_2.2
Red Hat · RHEL 8.2 EUS rhel_eus:8.2::baseos dhcp-server-debuginfo 12:4.3.6-40.el8_2.2

Vulnerabilities 1

  • High 7.4
    CVE-2021-25217

    A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient

    In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is …

    ISC ISC DHCP isc-dhcp isc-dhcp Debian Ubuntu Azure Linux Alpine

References

  • article
    https://access.redhat.com/security/updates/classification/#important
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1963258
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2420.json
  • report
    https://access.redhat.com/security/cve/CVE-2021-25217
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2021-25217
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2021-25217
  • article
    https://kb.isc.org/docs/cve-2021-25217