Remote denial of service in ISC BIND

Published: 2009-07-28
Severity High
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2009-0696
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software
Server applications / DNS servers

Vendor ISC

Security Advisory

This security advisory describes one high risk vulnerability.

1) Assertion failure

Severity: High

CVSSv3: 7.2 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:H/RL:O/RC:C] [PCI]

CVE-ID: CVE-2009-0696

CWE-ID: CWE-617 - Reachable Assertion


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

The vulnerability exists due to assertion failure in dns_db_findrdataset() function within db.c when named is configured as a master server. A remote unauthenticated attacker can send an ANY record in the prerequisite section of a crafted dynamic update message and trigger assertion failure and daemon exit.

Successful exploitation of this vulnerability may allow an attacker to perform denial of service (DoS) attack.

Note: this vulnerability is being actively exploited.


Update to version 9.4.3-P3, 9.5.1-P3 or 9.6.1-P1.

Vulnerable software versions

ISC BIND: 9.4, 9.4.1, 9.4.2, 9.4.3, 9.4.3-P1, 9.4.3-P2, 9.5, 9.5.1, 9.5.1-P1, 9.5.1-P2, 9.6, 9.6.1

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.