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Vulnerability record · CVE-2019-6471 · published 9 October 2019

CVE-2019-6471: F5 big-ip local traffic manager race condition vulnerability

F5 · Big Ip Local Traffic Manager

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.

5.9 CVSS 3.1 Medium EPSS 3.3% · top 11.9% CWE-362 · Race conditionCWE-617 · CWE-617
5.9CVSS 3.1 base score, v2 4.3
3.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
17Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

17 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://kb.isc.org/docs/cve-2019-6471 Third Party Advisory
https://support.f5.com/csp/article/K10092301?utm_source=f5support&amp%3Butm_medium=RSS
https://kb.isc.org/docs/cve-2019-6471 Third Party Advisory
https://support.f5.com/csp/article/K10092301?utm_source=f5support&amp%3Butm_medium=RSS

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-6471), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.