CVE-2020-36400 : ZeroMQ libzmq 4.3.3 has a heap-based buffer overflow in zmq::tcp

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

Published 2021-07-01 03:15:08

Updated 2021-07-06 11:41:43

Source MITRE

View at NVD, CVE.org

Vulnerability category: OverflowMemory Corruption

Products affected by CVE-2020-36400

Zeromq » Libzmq » Version: 4.3.3
cpe:2.3:a:zeromq:libzmq:4.3.3:*:*:*:*:*:*:*
Matching versions

EPSS FAQ

0.22%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 59 %

Percentile, the proportion of vulnerabilities that are scored at or less

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.5	HIGH	AV:N/AC:L/Au:N/C:P/I:P/A:P	10.0	6.4	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE-787 Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended buffer.

Assigned by: nvd@nist.gov (Primary)

https://github.com/zeromq/libzmq/commit/397ac80850bf8d010fae23dd215db0ee2c677306

Problem: ZMTP v1 static allocator is needlessly resized · zeromq/libzmq@397ac80 · GitHub
Patch;Third Party Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26042

26042 - libzmq:socket_connect_fuzzer: Heap-buffer-overflow in zmq::tcp_read - oss-fuzz
Issue Tracking;Mailing List;Patch;Third Party Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libzmq/OSV-2020-1887.yaml

oss-fuzz-vulns/OSV-2020-1887.yaml at main · google/oss-fuzz-vulns · GitHub
Third Party Advisory

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