CVE-2021-20236
Published: 28 May 2021
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.
Notes
| Author | Note |
|---|---|
| sespiros | large/too intrusive backport required for all affected releases |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
zeromq3 Launchpad, Ubuntu, Debian |
bionic |
Needed
|
| focal |
Needed
|
|
| 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 |
Needed
|
|
| upstream |
Released
(4.3.3-1)
|
|
| xenial |
Needed
|
|
|
Patches: upstream: https://github.com/zeromq/libzmq/pull/3959 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 9.8 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |