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Date: Mon, 11 May 2015 07:13:20 +0200
From: Salvatore Bonaccorso <>
	CVE Assignments MITRE <>
Subject: Re: CVE Request: zeromq downgrade attack


On Thu, May 07, 2015 at 04:49:08PM +0200, Alessandro Ghedini wrote:
> [ CCing upstream mailing list ]
> Hello,
> 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?

For reference, an update for this issue has been released yesterday in
Debian as


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