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CVE-2020-8621

CVE-2020-8621 · Attempting QNAME minimization after forwarding can lead to an assertion failure in resolver.c

This page contains facts from public vulnerability sources. Check the original advisory before updating.

In BIND 9.14.0 -> 9.16.5, 9.17.0 -> 9.17.3, If a server is configured with both QNAME minimization and 'forward first' then an attacker who can send queries to it may be able to trigger the condition that will cause the server to crash. Servers that 'forward only' are not affected.

CVSS 7.5 · High · EPSS 3.0% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • bind9

    Versions
    • ≥ 9.14.0: Affected; ≥ 9.16.6: Not affected; ≥ 9.17.0: Affected; ≥ 9.17.4: Not affected (custom)

    Update to 9.16.6

  • bind9 Debian:12

    Affected ranges
    • ECOSYSTEM: < 1:9.16.6-1

    Update to 1:9.16.6-1

  • bind9 Debian:13

    Affected ranges
    • ECOSYSTEM: < 1:9.16.6-1

    Update to 1:9.16.6-1

  • bind9 Debian:14

    Affected ranges
    • ECOSYSTEM: < 1:9.16.6-1

    Update to 1:9.16.6-1

  • bind9 Ubuntu:20.04:LTS

    Versions
    • 1:9.11.5.P4+dfsg-5.1ubuntu2
    • 1:9.11.5.P4+dfsg-5.1ubuntu3
    • 1:9.11.5.P4+dfsg-5.1ubuntu4
    • 1:9.11.5.P4+dfsg-5.1ubuntu5
    • 1:9.11.14+dfsg-1ubuntu1
    • 1:9.11.14+dfsg-3ubuntu1
    • 1:9.16.0-1ubuntu3
    • 1:9.16.0-1ubuntu4
    • 1:9.16.0-1ubuntu5
    • 1:9.16.1-0ubuntu1
    • 1:9.16.1-0ubuntu2
    • 1:9.16.1-0ubuntu2.1
    • 1:9.16.1-0ubuntu2.2
    Affected ranges
    • ECOSYSTEM: < 1:9.16.1-0ubuntu2.3

    Update to 1:9.16.1-0ubuntu2.3

Original sources

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