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Fencer Intel
medium 4.3

CVE-2014-9721 json

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 mechan…

published 11y ago modified 4mo ago also EUVD-2014-9527

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.5%
EPSS 2.5% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

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.

Patch / fix

  • zeromq3 Debian 14, Debian 13, Debian 12 4.0.5+dfsg-3

debian advisories DEBIAN-CVE-2014-9721

  • zeromq3 Ubuntu 14.04 LTS 4.0.4+dfsg-2ubuntu0.1

ubuntu advisories UBUNTU-CVE-2014-9721

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • zeromq SLED 12, SLE Workstation Extension 12, SLE Software Development Kit 12 +1 more 4.0.4-13.1

suse advisories SUSE-SU-2015:1510-1

  • zeromq openSUSE Tumbleweed 4.2.0-1.1

opensuse advisories openSUSE-SU-2024:10038-1

Is CVE-2014-9721 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2014-9721 updated cvss 6.1

zeromq: protocol downgrade attack on sockets using the ZMTP v3 protocol

  • Red Hat Ceph Storage 1.2 zeromq3
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.51% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.