What’s Vulnerable › Vulnerabilities

CVE-2020-36400

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-01 · updated 2026-06-17
• Weakness: CWE-787

Description

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

Affected products

• zeromq libzmq: 4.3.3

References

• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26042
• https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libzmq/OSV-2020-1887.yaml
• https://github.com/zeromq/libzmq/commit/397ac80850bf8d010fae23dd215db0ee2c677306
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26042
• https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libzmq/OSV-2020-1887.yaml
• https://github.com/zeromq/libzmq/commit/397ac80850bf8d010fae23dd215db0ee2c677306

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