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Date: Thu, 7 May 2015 16:49:08 +0200
From: Alessandro Ghedini <>
Subject: CVE Request: zeromq downgrade attack

[ CCing upstream mailing list ]


From :

> It is easy to bypass the security mechanism in 4.1.0 and 4.0.5 by sending a
> ZMTP v2 or earlier header. The library accepts such connections without
> applying its security mechanism.
> Solution: if security is defined on a socket, reject all V2 and earlier
> connections, unconditionally.

A patch for the zeromq 4.0.x stable series is available at

AFAICT no CVE has been assigned (or requested) for this, and the issue has
been public since December of last year.

Could a CVE be assigned please?


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