CVE-2015-8705: Problems converting OPT resource records and ECS options to text format can cause BIND to terminate
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CVE-2015-8705: Problems converting OPT resource records and ECS options to text format can cause BIND to terminate

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Article summary

CVE: CVE-2015-8705

Document version: 2.0

Posting date: 19 January 2016

Program impacted: BIND

Versions affected: 9.10.0->9.10.3-P2

Severity: Medium

Exploitable: Remotely


In versions of BIND 9.10, errors can occur when OPT pseudo-RR data or ECS options are formatted to text. In 9.10.3 through 9.10.3-P2, the issue may result in a REQUIRE assertion failure in buffer.c. In prior 9.10 versions, it may result in named crashing (such as with a segmentation fault) or other misbehavior due to a buffer overrun.


This issue can affect both authoritative and recursive servers if they are performing debug logging. (It may also crash related tools which use the same code, such as dig or delv.)

CVSS Score: 5.4

CVSS Vector: (AV:N/AC:H/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: CVE-2015-8705 can be avoided in named by disabling debug logging.

Active exploits: No known active exploits.

Solution: Upgrade to the patched release most closely related to your current version of BIND. This can be downloaded from

  • BIND 9 version 9.10.3-P3

Acknowledgements: ISC would like to thank Tatuya Jinmei of Infoblox for discovering and reporting one of the issues corrected in this fix.

Document Revision History:

1.0 Advance Notification. 12 January 2016 1.1 "Versions affected", "Severity", "Description", and "Impact" information corrected. 15 January 2016 2.0 Public disclosure. 19 January 2016

Related Documents: See our BIND 9 Security Vulnerability Matrix for a complete listing of Security Vulnerabilities and versions affected.

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Do you still have questions? Questions regarding this advisory should go to To 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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