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CVE-2015-8705: Problems converting OPT resource records and ECS options to text format can cause BIND to terminate.
Author: ISC Support Reference Number: AA-01336 Views: 61972 Created: 2016-01-19 11:30 Last Updated: 2016-04-18 23:33 0 Rating/ Voters
Document Version:          
Posting date: 
19 January 2016
Program Impacted: 
Versions affected: 


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:


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 BIND9 Security Vulnerability Matrix at for a complete listing of Security Vulnerabilities and versions affected.

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