CVE-2021-20236 — Classic Buffer Overflow in Zeromq

CWE-120 — Classic Buffer OverflowCWE-787 — Out-of-bounds Write7 documents7 sources
Severity
9.8CRITICALNVD
EPSS
0.3%
top 45.26%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
ZeromqFedoraproject FedoraRedhat Ceph Storage+1 more
Timeline
PublishedMay 28
Latest updateMay 24

Description

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 from this vulnerability is to confidentiality, integrity, as well as system availability.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages3 packages

▶NVDzeromq/zeromq< 4.3.3
▶CVEListV5zeromq/zeromqzeromq 4.3.3

Also affects: Fedora 33, Enterprise Linux 7.0

Patches

Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

3
GHSA
GHSA-4j25-p3vq-p264: A flaw was found in the ZeroMQ server in versions before 4↗2022-05-24
▶
OSV
CVE-2021-20236: A flaw was found in the ZeroMQ server in versions before 4↗2021-05-28
▶
CVEList
CVE-2021-20236: A flaw was found in the ZeroMQ server in versions before 4↗2021-05-28
▶

📋Vendor Advisories

3
Microsoft
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 th↗2021-05-11
▶
Debian
CVE-2021-20236: zeromq3 - A flaw was found in the ZeroMQ server in versions before 4.3.3. This flaw allows...↗2021
▶
Red Hat
zeromq: Stack overflow on server running PUB/XPUB socket↗2020-09-07
▶
CVE-2021-20236 — Classic Buffer Overflow in Zeromq | cvebase