Read the docs
TI-2020-18651 Aliases CVE-2020-36400GHSA-fw28-qj4f-2jpx

ZeroMQ libzmq 4.3.3 has a heap-based buffer overflow in zmq::tcp_read, a different vulnerability than CVE-2021-20235.

Priority MEDIUM 46CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

ZeroMQ libzmq 4.3.3 has a heap-based buffer overflow in zmq::tcp_read, a different vulnerability than CVE-2021-20235.

Why it matters now

EPSS 0.01842 79th 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

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:zeromq:libzmq:4.3.3:*:*:*:*:*:*:*4.3.3Vulnerablezeromq
  • cpe:2.3:a:zeromq:libzmq:4.3.3:*:*:*:*:*:*:* Versions 4.3.3 Vulnerable ·zeromq

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 2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-36400
  2. 2026-10-03 Alias added: GHSA-fw28-qj4f-2jpx

References

Patch 2

Advisory 1

  • TI-2019-09836 In ZeroMQ libzmq before 4.0.9, 4.1.x before 4.1.7, and 4.2.x before 4.3.2, a remote… CVSS 3.1CRITICAL 9.8
  • TI-2021-03530 Buffer overflow in zeromq CVSS 3.1HIGH 8.1
  • TI-2019-04448 A pointer overflow, with code execution, was discovered in ZeroMQ libzmq (aka 0MQ) 4.2.x… CVSS 3.0HIGH 8.8
  • TI-2020-11938 Denial of Service in ZeroMQ CVSS 3.1HIGH 7.5
  • TI-2021-03532 Uncontrolled resource consumption in zeromq CVSS 3.1HIGH 7.5
  • TI-2021-03529 Uncontrolled resource consumption in zeromq CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences