CVE-2021-40114

Multiple Cisco Products Snort Memory Leak Denial of Service Vulnerability

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

Multiple Cisco products are affected by a vulnerability in the way the Snort detection engine processes ICMP traffic 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 memory resource management while the Snort detection engine is processing ICMP packets. An attacker could exploit this vulnerability by sending a series of ICMP packets through an affected device. A successful exploit could allow the attacker to exhaust resources on the affected device, causing the device to reload.

Múltiples productos de Cisco están afectados por una vulnerabilidad en la forma en que el motor de detección Snort procesa el tráfico ICMP que podría permitir a un atacante remoto no autenticado causar una condición de denegación de servicio (DoS) en un dispositivo afectado. La vulnerabilidad es debido a una administración inapropiada de los recursos de memoria mientras el motor de detección Snort procesa paquetes ICMP. Un atacante podría explotar esta vulnerabilidad mediante el envío de una serie de paquetes ICMP mediante un dispositivo afectado. Una explotación con éxito podría permitir al atacante agotar los recursos del dispositivo afectado, causando la recarga del mismo

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2021-08-25 CVE Reserved
2021-10-27 CVE Published
2024-07-12 EPSS Updated
2024-11-07 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-401: Missing Release of Memory after Effective Lifetime
CWE-770: Allocation of Resources Without Limits or Throttling

CAPEC

References (3)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2023/02/msg00011.html	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-dos-s2R7W9UU	2023-11-07
https://www.debian.org/security/2023/dsa-5354	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Cisco Search vendor "Cisco"		Firepower Management Center Search vendor "Cisco" for product "Firepower Management Center"				2.9.14.0 Search vendor "Cisco" for product "Firepower Management Center" and version "2.9.14.0"		-		Affected
Cisco Search vendor "Cisco"		Firepower Management Center Search vendor "Cisco" for product "Firepower Management Center"				2.9.15 Search vendor "Cisco" for product "Firepower Management Center" and version "2.9.15"		-		Affected
Cisco Search vendor "Cisco"		Firepower Management Center Search vendor "Cisco" for product "Firepower Management Center"				2.9.16 Search vendor "Cisco" for product "Firepower Management Center" and version "2.9.16"		-		Affected
Cisco Search vendor "Cisco"		Firepower Management Center Search vendor "Cisco" for product "Firepower Management Center"				2.9.17 Search vendor "Cisco" for product "Firepower Management Center" and version "2.9.17"		-		Affected
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				< 6.4.0.12 Search vendor "Cisco" for product "Firepower Threat Defense" and version " < 6.4.0.12"		-		Affected
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				>= 6.5.0 < 6.6.3 Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 6.5.0 < 6.6.3"		-		Affected
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				>= 6.7.0 < 6.7.0.2 Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 6.7.0 < 6.7.0.2"		-		Affected
Cisco Search vendor "Cisco"		Unified Threat Defense Search vendor "Cisco" for product "Unified Threat Defense"				>= 16.12 < 16.12.6 Search vendor "Cisco" for product "Unified Threat Defense" and version " >= 16.12 < 16.12.6"		-		Affected
Cisco Search vendor "Cisco"		Unified Threat Defense Search vendor "Cisco" for product "Unified Threat Defense"				>= 17.3 < 17.3.4a Search vendor "Cisco" for product "Unified Threat Defense" and version " >= 17.3 < 17.3.4a"		-		Affected
Cisco Search vendor "Cisco"		Unified Threat Defense Search vendor "Cisco" for product "Unified Threat Defense"				>= 17.4 < 17.4.2 Search vendor "Cisco" for product "Unified Threat Defense" and version " >= 17.4 < 17.4.2"		-		Affected
Snort Search vendor "Snort"		Snort Search vendor "Snort" for product "Snort"				>= 2.0.0 < 2.9.18 Search vendor "Snort" for product "Snort" and version " >= 2.0.0 < 2.9.18"		-		Affected