CVE catalog

CVE-2014-9721

zeromq3: CVE-2014-9721

Severity: Medium · CVSS 6.5CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published: May 10, 2015, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 2.51% · Oct 25, 2026

libzmq before 4.0.6 and 4.1.x before 4.1.1 allows remote attackers to conduct downgrade attacks and bypass ZMTP v3 protocol security mechanisms via a ZMTP v2 or earlier header.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	zeromq3	sid	`4.3.5-1`	fixed
Debian	zeromq3	forky	`4.3.5-1`	fixed
Debian	zeromq3	trixie	`4.3.5-1`	fixed
Debian	zeromq3	bookworm	`4.3.4-6`	fixed
Ubuntu	zeromq3	14.04	`3.2.3+dfsg-2`	vulnerable
Ubuntu	zeromq3	14.04	`3.2.4+dfsg-1`	vulnerable
Ubuntu	zeromq3	14.04	`3.2.4+dfsg-2`	vulnerable
Ubuntu	zeromq3	14.04	`3.2.4+dfsg-3`	vulnerable
Ubuntu	zeromq3	14.04	`3.2.4+dfsg-4`	vulnerable
Ubuntu	zeromq3	14.04	`4.0.3+dfsg-1`	vulnerable
Ubuntu	zeromq3	14.04	`4.0.4+dfsg-2`	vulnerable
Ubuntu	zeromq3	14.04	`4.0.4+dfsg-2ubuntu0.1`	fixed
Suse	zeromq	linux enterprise desktop 12	`4.0.4-13.1`	fixed
Suse	zeromq	linux enterprise software development kit 12	`4.0.4-13.1`	fixed
Suse	zeromq	linux enterprise workstation extension 12	`4.0.4-13.1`	fixed
Suse	zeromq	enterprise storage 1.0	`4.0.4-13.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	zeromq3	source	sid	`4.0.5+dfsg-3`	not yet assigned	Not reported	[784366]
Debian	zeromq3	source	forky	`4.0.5+dfsg-3`	not yet assigned	Not reported	[784366]
Debian	zeromq3	source	trixie	`4.0.5+dfsg-3`	not yet assigned	Not reported	[784366]
Debian	zeromq3	source	bookworm	`4.0.5+dfsg-3`	not yet assigned	Not reported	[784366]
Ubuntu	zeromq3	deb	14.04	`4.0.4+dfsg-2ubuntu0.1`	Not reported	UBUNTU-CVE-2014-9721	Not reported
Suse	zeromq	rpm	linux enterprise desktop 12	`4.0.4-13.1`	Not reported	SUSE-SU-2015:1510-1	Not reported
Suse	zeromq	rpm	linux enterprise software development kit 12	`4.0.4-13.1`	Not reported	SUSE-SU-2015:1510-1	Not reported
Suse	zeromq	rpm	linux enterprise workstation extension 12	`4.0.4-13.1`	Not reported	SUSE-SU-2015:1510-1	Not reported
Suse	zeromq	rpm	enterprise storage 1.0	`4.0.4-13.1`	Not reported	SUSE-SU-2015:1510-1	Not reported

[Debian bug #784366]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libzmq3-dev]Fixed
Source package: [zeromq3]
Details (2)
- 4.3.4-6 · amd64 · bookworm
  Fixed · Fixed: 4.0.5+dfsg-3
  dsa · zeromq3 · debian · bookworm; dsa · zeromq3 · debian · 12
- 4.3.4-6 · arm64 · bookworm
  Fixed · Fixed: 4.0.5+dfsg-3
  dsa · zeromq3 · debian · bookworm; dsa · zeromq3 · debian · 12
[libzmq5]Fixed
Source package: [zeromq3]
Details (2)
- 4.3.4-6 · amd64 · bookworm
  Fixed · Fixed: 4.0.5+dfsg-3
  dsa · zeromq3 · debian · bookworm; dsa · zeromq3 · debian · 12
- 4.3.4-6 · arm64 · bookworm
  Fixed · Fixed: 4.0.5+dfsg-3
  dsa · zeromq3 · debian · bookworm; dsa · zeromq3 · debian · 12

[Debian 13 (Trixie)]

[libzmq3-dev]Fixed
Source package: [zeromq3]
Details (2)
- 4.3.5-1+b3 · amd64 · trixie
  Fixed · Fixed: 4.0.5+dfsg-3
  dsa · zeromq3 · debian · 13
- 4.3.5-1+b3 · arm64 · trixie
  Fixed · Fixed: 4.0.5+dfsg-3
  dsa · zeromq3 · debian · 13
[libzmq5]Fixed
Source package: [zeromq3]
Details (2)
- 4.3.5-1+b3 · amd64 · trixie
  Fixed · Fixed: 4.0.5+dfsg-3
  dsa · zeromq3 · debian · 13
- 4.3.5-1+b3 · arm64 · trixie
  Fixed · Fixed: 4.0.5+dfsg-3
  dsa · zeromq3 · debian · 13

Observed: Oct 23, 2026, 5:13:11 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]