Buffer overflow in Zeromq Libzmq

CVE-2020-36400

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

Vulnerability class: Buffer Overflow

EPSS: 0.018 (76.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Zeromq Libzmq — versions 4.3.3
N/a — versions n/a

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

cve@mitre.org (Patch, Mailing List, Third Party Advisory, x_refsource_MISC, Issue Tracking)
cve@mitre.org (Third Party Advisory, x_refsource_MISC)
cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2020-36400?: CVE-2020-36400 is a critical-severity vulnerability in Zeromq Libzmq, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-07-01.
How severe is CVE-2020-36400?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-36400 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.