9.8
CRITICAL
CVE-2021-20236
ZeroMQ Server Stack Buffer Overflow Vulnerability
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.

INFO

Published Date :

May 28, 2021, 11:15 a.m.

Last Modified :

Nov. 21, 2024, 5:46 a.m.

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2021-20236 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Redhat enterprise_linux
2 Redhat ceph_storage
1 Zeromq libzmq
2 Zeromq zeromq
1 Fedoraproject fedora
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-20236.

URL Resource
https://bugzilla.redhat.com/show_bug.cgi?id=1921976 Issue Tracking Third Party Advisory
https://github.com/zeromq/libzmq/security/advisories/GHSA-qq65-x72m-9wr8 Patch Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1921976 Issue Tracking Third Party Advisory
https://github.com/zeromq/libzmq/security/advisories/GHSA-qq65-x72m-9wr8 Patch Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-20236 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-20236 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=1921976
    Added Reference https://github.com/zeromq/libzmq/security/advisories/GHSA-qq65-x72m-9wr8
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Removed CWE Red Hat, Inc. CWE-787
  • Reanalysis by [email protected]

    Aug. 05, 2022

    Action Type Old Value New Value
    Added CWE NIST CWE-787
  • Initial Analysis by [email protected]

    Jun. 02, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=1921976 No Types Assigned https://bugzilla.redhat.com/show_bug.cgi?id=1921976 Issue Tracking, Third Party Advisory
    Changed Reference Type https://github.com/zeromq/libzmq/security/advisories/GHSA-qq65-x72m-9wr8 No Types Assigned https://github.com/zeromq/libzmq/security/advisories/GHSA-qq65-x72m-9wr8 Patch, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:a:zeromq:zeromq:*:*:*:*:*:*:*:* versions up to (excluding) 4.3.3
    Added CPE Configuration OR *cpe:2.3:a:redhat:ceph_storage:2.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-20236 is associated with the following CWEs:

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.33 }} -0.03%

score

0.70834

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability