Denial of service in ISC BIND

Published: 2013-07-26 | Updated: 2017-03-13
Severity High
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2013-4854
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) Denial of service

Severity: High


CVE-ID: CVE-2013-4854

CWE-ID: CWE-388 - Error Handling


The vulnerability allows a remote attacker to cause DoS conditions on the target system.

The weakness exists due to an error in the RFC 5011 implementation in rdata.c when parsing RDATA within a DNS query. By using a query with a malformed RDATA section that is not properly handled during construction of a log message, a remote attacker can cause an assertion failure and named daemon exit.

Successful exploitation of the vulnerability results in denial of service on the vulnerable system.

Note: the vulnerability was being actively exploited.


Install update from vendor's website.

Vulnerable software versions

ISC BIND: 9.8.0, 9.8.0 P4, 9.8.5, 9.9.0, 9.9.1, 9.9.2, 9.9.2 P1, 9.9.3

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user 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?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.