Buffer overflow in Zeromq
CVE-2021-20236
A flaw was found in the ZeroMQ server in versions before 4.3.3. This flaw allows a malicious client to cause a stack buffer overflow on the server by sending crafted topic subscription requests and then unsubscribing. The highest threat fr…
Vulnerability class: Buffer Overflow
EPSS: 0.016 (72.6th 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
- Fedoraproject Fedora — versions 33
- Redhat Ceph_storage — versions 2.0
- Redhat Enterprise_linux — versions 7.0
- N/a Zeromq — versions zeromq 4.3.3
Weakness classification (CWE)
References
- secalert@redhat.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)
- secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-20236?
- CVE-2021-20236 is a critical-severity vulnerability in Zeromq, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-05-28.
- How severe is CVE-2021-20236?
- Critical severity. CVSS v3 base score is 9.8 out of 10.