libzmq before 4.0.6 and 4.1.x before 4.1.1 allows remote attackers to conduct downgrade…
Priority LOW 25CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Medium
- Impact type
- —
- Confidentiality · integrity · availability
- None · Partial · None
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
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.
Why it matters now
EPSS 0.02511 84th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
Not affected: 1 product
- Red Hat Ceph Storage 1.2
Timeline
- 2026-10-02 Threatist record created from CVE-2014-9721
- 2026-10-03 Alias added: GHSA-cx82-pq93-6p39
References
More Zeromq vulnerabilities
- TI-2021-03531 Buffer overflow in zeromq CVSS 3.1CRITICAL 9.8
- TI-2014-06003 libzmq (aka ZeroMQ/C++) 4.0.x before 4.0.5 does not ensure that nonces are unique, which… CVSS 2.0MEDIUM 4.3
- TI-2014-06002 stream_engine.cpp in libzmq (aka ZeroMQ/C++)) 4.0.5 before 4.0.5 allows man-in-the-middle… CVSS 2.0MEDIUM 4.3
Sources
- CVE-2014-9721 · CVE Program
- CVE-2014-9721 · NVD
- FIRST EPSS
- GHSA-cx82-pq93-6p39 · GitHub Advisory Database · CC BY 4.0
- CVE-2014-9721 · Red Hat security data · CC BY 4.0
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