CVE-2021-20237
Published: 28 May 2021
An uncontrolled resource consumption (memory leak) flaw was found in ZeroMQ's src/xpub.cpp in versions before 4.3.3. This flaw allows a remote unauthenticated attacker to send crafted PUB messages that consume excessive memory if the CURVE/ZAP authentication is disabled on the server, causing a denial of service. The highest threat from this vulnerability is to system availability.
Notes
| Author | Note |
|---|---|
| sespiros | Upstream patch introduces a regression which is addressed in https://github.com/zeromq/libzmq/pull/3959 (which fixes CVE-2021-20236) |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
zeromq3 Launchpad, Ubuntu, Debian |
bionic |
Released
(4.2.5-1ubuntu0.2+esm2)
Available with Ubuntu Pro |
| focal |
Released
(4.3.2-2ubuntu1.20.04.1~esm2)
Available with Ubuntu Pro |
|
| groovy |
Ignored
(end of life)
|
|
| hirsute |
Not vulnerable
(4.3.4-1)
|
|
| impish |
Not vulnerable
(4.3.4-1)
|
|
| jammy |
Not vulnerable
(4.3.4-1)
|
|
| kinetic |
Not vulnerable
(4.3.4-1)
|
|
| lunar |
Not vulnerable
(4.3.4-1)
|
|
| mantic |
Not vulnerable
(4.3.4-1)
|
|
| trusty |
Not vulnerable
(4.0.4+dfsg-2ubuntu0.1+esm2)
|
|
| upstream |
Released
(4.3.3-1)
|
|
| xenial |
Not vulnerable
(4.1.4-7ubuntu0.1+esm1)
|
|
|
Patches: upstream: https://github.com/zeromq/libzmq/pull/3935 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |