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Fencer Vulns
medium 5.9

CVE-2019-6471 json

A race condition when discarding malformed packets can cause BIND to exit with an assertion failure

published 2019-10-09 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-16031

cvss
5.9
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.3%
EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

A race condition which may occur when discarding malformed packets can result in BIND exiting due to a REQUIRE assertion failure in dispatch.c. Versions affected: BIND 9.11.0 -> 9.11.7, 9.12.0 -> 9.12.4-P1, 9.14.0 -> 9.14.2. Also all releases of the BIND 9.13 development branch and version 9.15.0 of the BIND 9.15 development branch and BIND Supported Preview Edition versions 9.11.3-S1 -> 9.11.7-S1.

Patch / fix

  • bind9 Debian 14, Debian 13, Debian 12 1:9.11.5.P4+dfsg-5.1

debian advisories DEBIAN-CVE-2019-6471

  • bind9 Ubuntu 18.04 LTS 1:9.11.3+dfsg-1ubuntu1.8

ubuntu advisories UBUNTU-CVE-2019-6471

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • bind RHEL 8 32:9.11.4-17.P2.el8_0.1
  • bind-sdb RHEL 8 32:9.11.4-17.P2.el8_0.1
  • bind-libs RHEL 8 32:9.11.4-17.P2.el8_0.1
  • bind-utils RHEL 8 32:9.11.4-17.P2.el8_0.1
  • bind-chroot RHEL 8 32:9.11.4-17.P2.el8_0.1
  • bind-pkcs11 RHEL 8 32:9.11.4-17.P2.el8_0.1
  • bind-license RHEL 8 32:9.11.4-17.P2.el8_0.1
  • python3-bind RHEL 8 32:9.11.4-17.P2.el8_0.1

red hat advisories RHSA-2019:1714

  • bind SLE Module for Server Applications 15 SP1, SLE Module for Server Applications 15, SLE Module for Basesystem 15 SP1 +1 more 9.11.2-12.13.2
  • bind SLES for SAP 12 SP4, SLES 12 SP4, SLED 12 SP4 +1 more 9.11.2-3.10.1

suse advisories SUSE-SU-2019:2550-1SUSE-SU-2019:2502-1

  • bind openSUSE Tumbleweed 9.16.20-1.4
  • bind openSUSE Leap 15.1 9.11.2-lp151.11.6.1
  • bind openSUSE Leap 15.0 9.11.2-lp150.8.16.1

opensuse advisories openSUSE-SU-2024:10650-1openSUSE-SU-2019:2265-1openSUSE-SU-2019:2263-1

  • bind Alpine 3.10 9.14.3-r0
  • bind Alpine 3.24, Alpine 3.23, Alpine 3.22 +11 more 9.14.4-r0
  • bind Alpine 3.7 9.11.8-r0
  • bind Alpine 3.9, Alpine 3.8 9.12.4_p2-r0

alpine advisories ALPINE-CVE-2019-6471

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-6471 updated cvss 5.9

bind: Race condition when discarding malformed packets can cause bind to exit with assertion failure

  • Red Hat Enterprise Linux AppStream (v. 8) bind 9.11.4-17.P2.el8_0.1, bind-sdb 9.11.4-17.P2.el8_0.1, bind-libs 9.11.4-17.P2.el8_0.1, bind-utils 9.11.4-17.P2.el8_0.1, bind-chroot 9.11.4-17.P2.el8_0.1, bind-pkcs11 9.11.4-17.P2.el8_0.1, +6 more Red Hat Enterprise Linux BaseOS (v. 8) bind 9.11.4-17.P2.el8_0.1, bind-export-libs 9.11.4-17.P2.el8_0.1
    fixed: vendor fix RHSA-2019:1714
  • Red Hat Enterprise Linux 5 bind, bind97 Red Hat Enterprise Linux 6 bind, bind-sdb, bind-libs, bind-utils, bind-chroot Red Hat Enterprise Linux 7 bind, bind-sdb, bind-libs, bind-utils, bind-chroot, bind-pkcs11, +6 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.29% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

  • ISC BIND 9

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
  • CWE-617 Reachable Assertion

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.