Hello,

I have reviewed this document as part of the security directorate’s ongoing
effort to review all IETF documents being processed by the IESG. These
comments were written primarily for the benefit of the security area
directors. Document editors and WG chairs should treat these comments just
like any other last call comments.

Summary: ready

Globally, this ID looks ready to me.

I only have a small comment: an ID introducing a extension of a given protocol usually starts its "Security Considerations" section with a link to the "Security Consideration" section of base RFC it depends on, since what applies there also applies in general.
For instance, RFC 4585 on extended RFC profiles discusses timing attacks that IMHO also apply here (eg. what happens if a malicious entity does not follow timing rules of section 4.2.3).
Also, RFC 4585 recommends in its "Security Consideration" section that "Senders as well as receivers SHOULD behave conservatively when observing strange reporting behavior", whereas no such recommendation is done here.

Regards,   Vincent