CVE-2021-1236
Publication date 13 January 2021
Last updated 26 August 2025
Ubuntu priority
Description
Multiple Cisco products are affected by a vulnerability in the Snort application detection engine that could allow an unauthenticated, remote attacker to bypass the configured policies on an affected system. The vulnerability is due to a flaw in the detection algorithm. An attacker could exploit this vulnerability by sending crafted packets that would flow through an affected system. A successful exploit could allow the attacker to bypass the configured policies and deliver a malicious payload to the protected network.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| snort | 25.10 questing | Not in release |
| 24.04 LTS noble |
Not affected
|
|
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal |
Vulnerable
|
|
| 18.04 LTS bionic |
Vulnerable
|
|
| 16.04 LTS xenial |
Vulnerable
|
|
| 14.04 LTS trusty |
Vulnerable
|
Notes
yomonokio
There is no access to the actual fix for this CVE nor workarounds that address this vulnerability
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
4.0 · Medium
|
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Changed |
| Confidentiality | None |
| Integrity impact | Low |
| Availability impact | None |
| Vector | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N |