MEDIUM
zeromq: protocol downgrade attack on sockets using the ZMTP v3 protocol
Published Jun 3, 2015
4.3
MEDIUMCVSS 2.0
EPSS 2.51%
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
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
4.3 MEDIUM NVD
AV:N/AC:M/Au:N/C:N/I:P/A:N
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact None
Integrity Impact Partial
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
2.51% 0.02511
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
EPSS probability 0.02511
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 2.51% (0.02511) | 84.23th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.53% (0.02529) | 82.79th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.61% (0.00614) | 68.05th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.46% (0.00465) | 76.27th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.46% (0.00465) | 74.70th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.46% (0.00465) | 71.59th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 17, 2023 | 1.21% (0.01213) | 66.22th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
Weaknesses (1)
References (9)
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/159176.html vendor-advisoryx_refsource_FEDORA
- http://lists.opensuse.org/opensuse-updates/2015-06/msg00018.html vendor-advisoryx_refsource_SUSE
- http://www.debian.org/security/2015/dsa-3255 vendor-advisoryx_refsource_DEBIAN
- https://access.redhat.com/security/cve/CVE-2014-9721 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1221666 Issue Tracking
- https://github.com/zeromq/libzmq/issues/1273 x_refsource_CONFIRM
- https://github.com/zeromq/zeromq4-x/commit/b6e3e0f601e2c1ec1f3aac880ed6a3fe63043e51 x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2014-9721
- https://www.cve.org/CVERecord?id=CVE-2014-9721
| Link | Providers | Tags |
|---|---|---|
| http://lists.fedoraproject.org/pipermail/package-announce/2015-May/159176.html | vendor-advisoryx_refsource_FEDORA | |
| http://lists.opensuse.org/opensuse-updates/2015-06/msg00018.html | vendor-advisoryx_refsource_SUSE | |
| http://www.debian.org/security/2015/dsa-3255 | vendor-advisoryx_refsource_DEBIAN | |
| https://access.redhat.com/security/cve/CVE-2014-9721 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1221666 | Issue Tracking | |
| https://github.com/zeromq/libzmq/issues/1273 | x_refsource_CONFIRM | |
| https://github.com/zeromq/zeromq4-x/commit/b6e3e0f601e2c1ec1f3aac880ed6a3fe63043e51 | x_refsource_CONFIRM | |
| https://nvd.nist.gov/vuln/detail/CVE-2014-9721 | ||
| https://www.cve.org/CVERecord?id=CVE-2014-9721 |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Jun 3, 2015
Updated Aug 6, 2024
Reserved May 21, 2015
Link CVE-2014-9721
CISA Vulnrichment
Updated n/a