Vulnerability Details : CVE-2021-1236
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.
Products affected by CVE-2021-1236
- cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_management_center:2.9.16:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_management_center:2.9.15:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_management_center:2.9.14.0:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_management_center:2.9.17:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_management_center:2.9.14.14:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
- cpe:2.3:a:snort:snort:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-1236
0.23%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 62 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-1236
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:P/A:N |
10.0
|
2.9
|
NIST | |
4.0
|
MEDIUM | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N |
2.2
|
1.4
|
Cisco Systems, Inc. | |
5.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
3.9
|
1.4
|
NIST |
CWE ids for CVE-2021-1236
-
The code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated.Assigned by:
- nvd@nist.gov (Primary)
- ykramarz@cisco.com (Secondary)
References for CVE-2021-1236
-
https://lists.debian.org/debian-lts-announce/2023/02/msg00011.html
[SECURITY] [DLA 3317-1] snort security update
-
https://www.debian.org/security/2023/dsa-5354
Debian -- Security Information -- DSA-5354-1 snort
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-app-bypass-cSBYCATq
Multiple Cisco Products Snort Application Detection Engine Policy Bypass VulnerabilityVendor Advisory
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