UBUNTU-CVE-2021-1236

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Source
https://ubuntu.com/security/CVE-2021-1236
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-1236.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-1236
Upstream
Published
2021-01-13T22:15:00Z
Modified
2025-10-24T04:49:08Z
Severity
  • 4.0 (Medium) CVSS_V3 - CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N CVSS Calculator
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:14.04:LTS / snort

Package

Name
snort
Purl
pkg:deb/ubuntu/snort@2.9.6.0-0ubuntu1?arch=source&distro=trusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.9.2.2-3
2.9.5.3-3
2.9.6.0-0ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "snort",
            "binary_version": "2.9.6.0-0ubuntu1"
        },
        {
            "binary_name": "snort-common",
            "binary_version": "2.9.6.0-0ubuntu1"
        },
        {
            "binary_name": "snort-common-libraries",
            "binary_version": "2.9.6.0-0ubuntu1"
        },
        {
            "binary_name": "snort-rules-default",
            "binary_version": "2.9.6.0-0ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-1236.json"

Ubuntu:16.04:LTS / snort

Package

Name
snort
Purl
pkg:deb/ubuntu/snort@2.9.7.0-5?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.9.7.0-5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "snort",
            "binary_version": "2.9.7.0-5"
        },
        {
            "binary_name": "snort-common",
            "binary_version": "2.9.7.0-5"
        },
        {
            "binary_name": "snort-common-libraries",
            "binary_version": "2.9.7.0-5"
        },
        {
            "binary_name": "snort-rules-default",
            "binary_version": "2.9.7.0-5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-1236.json"

Ubuntu:18.04:LTS / snort

Package

Name
snort
Purl
pkg:deb/ubuntu/snort@2.9.7.0-5build1?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.9.7.0-5
2.9.7.0-5build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "snort",
            "binary_version": "2.9.7.0-5build1"
        },
        {
            "binary_name": "snort-common",
            "binary_version": "2.9.7.0-5build1"
        },
        {
            "binary_name": "snort-common-libraries",
            "binary_version": "2.9.7.0-5build1"
        },
        {
            "binary_name": "snort-rules-default",
            "binary_version": "2.9.7.0-5build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-1236.json"

Ubuntu:20.04:LTS / snort

Package

Name
snort
Purl
pkg:deb/ubuntu/snort@2.9.7.0-5build1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.9.7.0-5build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "snort",
            "binary_version": "2.9.7.0-5build1"
        },
        {
            "binary_name": "snort-common",
            "binary_version": "2.9.7.0-5build1"
        },
        {
            "binary_name": "snort-common-libraries",
            "binary_version": "2.9.7.0-5build1"
        },
        {
            "binary_name": "snort-rules-default",
            "binary_version": "2.9.7.0-5build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-1236.json"