CVE-2021-40116 : Multiple Cisco products are affected by a vulnerability in Snort rules that coul

Multiple Cisco products are affected by a vulnerability in Snort rules that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.The vulnerability is due to improper handling of the Block with Reset or Interactive Block with Reset actions if a rule is configured without proper constraints. An attacker could exploit this vulnerability by sending a crafted IP packet to the affected device. A successful exploit could allow the attacker to cause through traffic to be dropped. Note: Only products with Snort3 configured and either a rule with Block with Reset or Interactive Block with Reset actions configured are vulnerable. Products configured with Snort2 are not vulnerable.

Published 2021-10-27 19:15:09

Updated 2024-11-26 16:09:02

Source Cisco Systems, Inc.

View at NVD, CVE.org

Vulnerability category: Denial of service

Products affected by CVE-2021-40116

Cisco » Firepower Threat Defense
Versions from including (>=) 6.4.0 and before (<) 6.4.0.13
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
Matching versions
Cisco » Firepower Threat Defense
Versions from including (>=) 7.0.0 and before (<) 7.0.1
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
Matching versions
Cisco » Firepower Threat Defense
Versions from including (>=) 6.7.0 and before (<) 6.7.0.3
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
Matching versions
Cisco » Firepower Threat Defense
Versions from including (>=) 6.6.0 and before (<) 6.6.5.1
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
Matching versions
Cisco » Secure Firewall Management Center » Version: 3.1.0.1
cpe:2.3:a:cisco:secure_firewall_management_center:3.1.0.1:*:*:*:*:*:*:*
Matching versions
Snort » Snort
Versions from including (>=) 3.0.0.0 and before (<) 3.1.0.100
cpe:2.3:a:snort:snort:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2021-40116

EPSS FAQ

0.16%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 53 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-40116

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source	First Seen
7.1	HIGH	AV:N/AC:M/Au:N/C:N/I:N/A:C	8.6	6.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Complete
8.6	HIGH	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	3.9	4.0	Cisco Systems, Inc.
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High
7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High
8.6	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	3.9	4.0	Cisco Systems, Inc.	2024-11-26
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2021-40116

CWE-241 Improper Handling of Unexpected Data Type

The product does not handle or incorrectly handles when a particular element is not the expected type, e.g. it expects a digit (0-9) but is provided with a letter (A-Z).

Assigned by: ykramarz@cisco.com (Secondary)

References for CVE-2021-40116

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-dos-RywH7ezM

Multiple Cisco Products Snort Rule Denial of Service Vulnerability
Vendor Advisory

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Vulnerability Details : CVE-2021-40116

Products affected by CVE-2021-40116

Exploit prediction scoring system (EPSS) score for CVE-2021-40116

CVSS scores for CVE-2021-40116

CWE ids for CVE-2021-40116

References for CVE-2021-40116