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OpenAdvisories
High RHSA-2025:21889 3 CVEs

Red Hat Security Advisory: bind security update

Published Nov 21, 2025 · Updated Oct 14, 2026

Ecosystem: Red Hat

Fixed packages 13

ReleasePackageFixed in
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream bind 32:9.16.23-1.el9_0.11
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream bind-chroot 32:9.16.23-1.el9_0.11
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream bind-debuginfo 32:9.16.23-1.el9_0.11
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream bind-debugsource 32:9.16.23-1.el9_0.11
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream bind-dnssec-doc 32:9.16.23-1.el9_0.11
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream bind-dnssec-utils 32:9.16.23-1.el9_0.11
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream bind-dnssec-utils-debuginfo 32:9.16.23-1.el9_0.11
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream bind-libs 32:9.16.23-1.el9_0.11
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream bind-libs-debuginfo 32:9.16.23-1.el9_0.11
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream bind-license 32:9.16.23-1.el9_0.11
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream bind-utils 32:9.16.23-1.el9_0.11
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream bind-utils-debuginfo 32:9.16.23-1.el9_0.11
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream python3-bind 32:9.16.23-1.el9_0.11

Vulnerabilities 3

  • High 8.6
    CVE-2025-40778 Public exploit

    Cache poisoning attacks with unsolicited RRs

    Under certain circumstances, BIND is too lenient when accepting records from answers, allowing an attacker to inject forged data into the cache. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 …

    ISC BIND 9 bind9 bind9 Debian Ubuntu Azure Linux Alpine Wolfi
  • High 8.6
    CVE-2025-40780

    Cache poisoning due to weak PRNG

    In specific circumstances, due to a weakness in the Pseudo Random Number Generator (PRNG) that is used, it is possible for an attacker to predict the source port and query ID that BIND will use. This issue affects BIND 9 versions 9.16.0 through 9.16.50, 9.18.…

    ISC BIND 9 bind9 bind9 Debian Ubuntu Azure Linux Alpine Wolfi
  • Medium 6.8
    CVE-2021-25220

    DNS forwarders - cache poisoning vulnerability

    BIND 9.11.0 -> 9.11.36 9.12.0 -> 9.16.26 9.17.0 -> 9.18.0 BIND Supported Preview Editions: 9.11.4-S1 -> 9.11.36-S1 9.16.8-S1 -> 9.16.26-S1 Versions of BIND 9 earlier than those shown - back to 9.1.0, including Supported Preview Editions - are also believed to…

    ISC BIND bind9 bind9 Debian Ubuntu Azure Linux Alpine

References

  • article
    https://access.redhat.com/security/updates/classification/#important
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2064512
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2405827
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2405829
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_21889.json
  • report
    https://access.redhat.com/security/cve/CVE-2021-25220
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2021-25220
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2021-25220
  • article
    https://kb.isc.org/docs/CVE-2021-25220
  • report
    https://access.redhat.com/security/cve/CVE-2025-40778
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2025-40778
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2025-40778
  • report
    https://access.redhat.com/security/cve/CVE-2025-40780
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2025-40780
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2025-40780