CVE-2022-3488: BIND Supported Preview Edition named may terminate unexpectedly when processing ECS options in repeated responses to iterative queries
  • 25 Jan 2023
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CVE-2022-3488: BIND Supported Preview Edition named may terminate unexpectedly when processing ECS options in repeated responses to iterative queries

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Article summary

CVE: CVE-2022-3488

Document version: 2.0

Posting date: 25 January 2023

Program impacted: BIND 9

Versions affected:

BIND Supported Preview Edition

  • 9.11.4-S1 -> 9.11.37-S1
  • 9.16.8-S1 -> 9.16.36-S1

Severity: High

Exploitable: Remotely


Processing of repeated responses to the same query, where both responses contain ECS pseudo-options, but where the first is broken in some way, can cause BIND to exit with an assertion failure.

'Broken' in this context is anything that would cause the resolver to reject the query response, such as a mismatch between query and answer name.


An attacker controlling a malicious nameserver could respond with two responses in quick succession, each with a "CLIENT-SUBNET" pseudo-option and where the first is broken. Processing the second response after the first causes named to terminate.

All affected versions of the BIND Supported Preview Edition are vulnerable, including those that are not configured to use ECS.

CVSS Score: 7.5


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


No workarounds known.

Active exploits:

We are not aware of any active exploits.


Upgrade to the patched release most closely related to your current version of BIND 9:

BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers.

  • 9.16.37-S1


ISC would like to thank Infoblox for bringing this vulnerability to our attention.

Document revision history:

  • 1.0 Early Notification, 18 January 2023
  • 2.0 Public disclosure, 25 January 2023

Related documents:

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 be mailed 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:


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 at

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

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