#VU21568 Race condition in ISC BIND - CVE-2019-6471

Vulnerability identifier: #VU21568

Vulnerability risk: Medium

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2019-6471

CWE-ID: CWE-362

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
ISC BIND

Software vendor:
ISC

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a race condition when processing DNS requests in dispatch.c. A remote attacker can send specially crafted DNS packets to the affected daemon, trigger a REQUIRE assertion failure and crash the DNS server.

Install updates from vendor's website.

• https://kb.isc.org/docs/cve-2019-6471