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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.018 (78.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000
Affected products
- Zeromq Libzmq — versions 4.3.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugs.chromium.org/p/oss-fuzz/issues/detail (Patch, Mailing List, Third Party Advisory, Issue Tracking)
- github.com/google/oss-fuzz-vulns/blob/main/vulns/libzmq/OSV-2020-1887.yaml (Third Party Advisory)
- github.com/zeromq/libzmq/commit/397ac80850bf8d010fae23dd215db0ee2c677306 (Patch, Third Party Advisory)
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.