CVE-2021-34781
Cisco Firepower Threat Defense Software SSH Connections Denial of Service Vulnerability
Severity Score
7.5
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
Attend
*SSVC
Descriptions
A vulnerability in the processing of SSH connections for multi-instance deployments of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on the affected device. This vulnerability is due to a lack of proper error handling when an SSH session fails to be established. An attacker could exploit this vulnerability by sending a high rate of crafted SSH connections to the instance. A successful exploit could allow the attacker to cause resource exhaustion, which causes a DoS condition on the affected device. The device must be manually reloaded to recover.
Una vulnerabilidad en el procesamiento de las conexiones SSH para las implementaciones de múltiples instancias del software Cisco Firepower Threat Defense (FTD) podría permitir a un atacante remoto no autenticado causar una condición de denegación de servicio (DoS) en el dispositivo afectado. Esta vulnerabilidad es debido a una falta de administración adecuada de errores cuando no es posible establecer una sesión SSH. Un atacante podría explotar esta vulnerabilidad mediante el envío de una alta tasa de conexiones SSH diseñadas a la instancia. Una explotación con éxito podría permitir al atacante causar un agotamiento de los recursos, que causa una condición de DoS en el dispositivo afectado. El dispositivo debe ser recargado manualmente para recuperarse
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:Attend
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2021-06-15 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-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
- CWE-755: Improper Handling of Exceptional Conditions
CAPEC
References (1)
| URL | Tag | Source |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-dos-rUDseW3r | 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 Virtual Appliance Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" | 6.3.0 Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" and version "6.3.0" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Firepower Management Center Virtual Appliance Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" | 6.4.0 Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" and version "6.4.0" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Firepower Management Center Virtual Appliance Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" | 6.4.0.13 Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" and version "6.4.0.13" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Firepower Management Center Virtual Appliance Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" | 6.5.0 Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" and version "6.5.0" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Firepower Management Center Virtual Appliance Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" | 6.6.0 Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" and version "6.6.0" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Firepower Management Center Virtual Appliance Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" | 6.7.0.3 Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" and version "6.7.0.3" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Firepower Management Center Virtual Appliance Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" | 6.7.1 Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" and version "6.7.1" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Firepower Management Center Virtual Appliance Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" | 7.0.0 Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" and version "7.0.0" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense" | >= 6.3.0 < 6.4.0.13 Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 6.3.0 < 6.4.0.13" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense" | >= 6.5.0 < 6.6.5 Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 6.5.0 < 6.6.5" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense" | >= 6.7.0 < 6.7.0.3 Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 6.7.0 < 6.7.0.3" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense" | >= 7.0.0 < 7.0.1 Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 7.0.0 < 7.0.1" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Sourcefire Defense Center Search vendor "Cisco" for product "Sourcefire Defense Center" | 6.3.0 Search vendor "Cisco" for product "Sourcefire Defense Center" and version "6.3.0" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Sourcefire Defense Center Search vendor "Cisco" for product "Sourcefire Defense Center" | 6.4.0 Search vendor "Cisco" for product "Sourcefire Defense Center" and version "6.4.0" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Sourcefire Defense Center Search vendor "Cisco" for product "Sourcefire Defense Center" | 6.4.0.13 Search vendor "Cisco" for product "Sourcefire Defense Center" and version "6.4.0.13" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Sourcefire Defense Center Search vendor "Cisco" for product "Sourcefire Defense Center" | 6.5.0 Search vendor "Cisco" for product "Sourcefire Defense Center" and version "6.5.0" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Sourcefire Defense Center Search vendor "Cisco" for product "Sourcefire Defense Center" | 6.6.0 Search vendor "Cisco" for product "Sourcefire Defense Center" and version "6.6.0" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Sourcefire Defense Center Search vendor "Cisco" for product "Sourcefire Defense Center" | 6.7.0.3 Search vendor "Cisco" for product "Sourcefire Defense Center" and version "6.7.0.3" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Sourcefire Defense Center Search vendor "Cisco" for product "Sourcefire Defense Center" | 6.7.1 Search vendor "Cisco" for product "Sourcefire Defense Center" and version "6.7.1" | - |
Affected
| ||||||
| Cisco Search vendor "Cisco" | Sourcefire Defense Center Search vendor "Cisco" for product "Sourcefire Defense Center" | 7.0.0 Search vendor "Cisco" for product "Sourcefire Defense Center" and version "7.0.0" | - |
Affected
| ||||||