Security update for mDNSResponder

Current versions of Apple products use the updated version of Bonjour. For previous versions, Apple has issued a security update.

Apple has issued a security update for mDNSResponder, the low-level open source software that implements Bonjour in Apple and third-party products.

Which Apple platforms are affected?


  • Versions prior to OS X El Capitan v10.11.1

  • Versions prior to OS X Yosemite v10.10.5 with Security Update 2015-004 Yosemite

  • Versions prior to OS X Mavericks v10.9.5 with Security Update 2015-007 Mavericks

iOS versions prior to iOS 9.1

watchOS versions prior to watchOS 2.1

AirPort Base Station Firmware versions prior to 7.7.7 and 7.6.7

Is the third-party product I use affected by this issue?

Apple has coordinated with many vendors to make sure that they are aware of the availability of this update.

For non-Apple products, we suggest that you reach out to your vendor to determine if a product you use is affected and whether the vendor has already updated their product.

Information about products not manufactured by Apple, or independent websites not controlled or tested by Apple, is provided without recommendation or endorsement. Apple assumes no responsibility with regard to the selection, performance, or use of third-party websites or products. Apple makes no representations regarding third-party website accuracy or reliability. Contact the vendor for additional information.

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