What’s Vulnerable › Vulnerabilities

CVE-2014-9721

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2015-06-03 · updated 2026-06-17
• Weakness: CWE-20

Description

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.

Affected products

• Zeromq: through 4.0.5; 4.1.0-rc1

References

• http://lists.fedoraproject.org/pipermail/package-announce/2015-May/159176.html
• http://lists.opensuse.org/opensuse-updates/2015-06/msg00018.html
• http://www.debian.org/security/2015/dsa-3255
• https://github.com/zeromq/libzmq/issues/1273
• https://github.com/zeromq/zeromq4-x/commit/b6e3e0f601e2c1ec1f3aac880ed6a3fe63043e51
• http://lists.fedoraproject.org/pipermail/package-announce/2015-May/159176.html
• http://lists.opensuse.org/opensuse-updates/2015-06/msg00018.html
• http://www.debian.org/security/2015/dsa-3255
• https://github.com/zeromq/libzmq/issues/1273
• https://github.com/zeromq/zeromq4-x/commit/b6e3e0f601e2c1ec1f3aac880ed6a3fe63043e51

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