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OpenAdvisories
High DSA-4909-1 3 CVEs

bind9 - security update

Published May 1, 2021 · Updated Mar 9, 2026

Ecosystem: Debian

Fixed packages 1

ReleasePackageFixed in
Debian · 10 bind9 1:9.11.5.P4+dfsg-5.1+deb10u5

Vulnerabilities 3

  • High 8.1
    CVE-2021-25216 EPSS 83%

    A second vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attack

    In BIND 9.5.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.11.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.1 of the BIND 9.17 development branch, BIND servers are vulnerable…

    ISC BIND9 bind9 bind9 Debian Ubuntu Alpine
  • High 7.5
    CVE-2021-25215 EPSS 12%

    An assertion check can fail while answering queries for DNAME records that require the DNAME to be processed to resolve itself

    In BIND 9.0.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.9.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.11 of the BIND 9.17 development branch, when a vulnerable version o…

    ISC BIND9 bind9 bind9 Debian Ubuntu Alpine
  • Medium 6.5
    CVE-2021-25214

    A broken inbound incremental zone update (IXFR) can cause named to terminate unexpectedly

    In BIND 9.8.5 -> 9.8.8, 9.9.3 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.9.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND 9 Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.11 of the BIND 9.17 development branch, when a vu…

    ISC BIND9 bind9 bind9 Debian Ubuntu Alpine