CVE-2014-3859: BIND named can crash due to a defect in EDNS printing processing
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CVE-2014-3859: BIND named can crash due to a defect in EDNS printing processing

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Article summary

A specially crafted query sent to a BIND nameserver can cause it to crash with a REQUIRE assertion error.

CVE: CVE-2014-3859  

Document version: 2.0

Posting date: 11 June 2014

Program impacted: BIND 9

Versions affected: 9.10.0, 9.10.0-P1

Severity: Critical

Exploitable: Remotely


A query specially crafted to exploit a defect in EDNS option processing can cause named to terminate with an assertion failure.


Both authoritative and recursive servers are vulnerable to this defect. Exploitation of this condition can cause a denial of service in nameservers running affected versions of BIND 9.10. Access Control Lists do not provide protection.

The bug which causes this condition is in libdns; consequently, in addition to the named server process, other applications (for example: dig and delv) built using the libdns library from the affected source distributions can also be forced to crash with assertion failures triggered in the same fashion.

CVSS Score: 7.8

CVSS Equation: (AV:N/AC:L/Au:N/C:N/I:N/A:C)

For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit:

Workarounds: No known workarounds at this time. 

Active exploits: There are no known active exploits.


Upgrade to the patched release most closely related to your current version of BIND. Open source versions can all be downloaded from

  • BIND 9 version 9.10.0-P2

Acknowledgements: ISC would like to thank Codenomicon for detecting this issue.

Document Revision History:

1.0 Phase One, Advance Notification, 04 June 2014
2.0 Phase Four, Public Disclosure, 11 June 2014

Related Documents:

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See our BIND 9 Security Vulnerability Matrix for a complete listing of security vulnerabilities and versions affected.

Do you still have questions? Questions regarding this advisory should go to security-officer@isc.orgTo report a new issue, please encrypt your message using's PGP key which can be found here: If you are unable to use encrypted email, you may also report new issues at:

Note: ISC patches only currently supported versions. When possible, we indicate EOL versions affected. (For current information on which versions are actively supported, please see 

ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found in the ISC Software Defect and Security Vulnerability Disclosure Policy.

This Knowledgebase article is the complete and official security advisory document.

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