CVE-2021-34741
Cisco Email Security Appliance 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 email scanning algorithm of Cisco AsyncOS software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to perform a denial of service (DoS) attack against an affected device. This vulnerability is due to insufficient input validation of incoming emails. An attacker could exploit this vulnerability by sending a crafted email through Cisco ESA. A successful exploit could allow the attacker to exhaust all the available CPU resources on an affected device for an extended period of time, preventing other emails from being processed and resulting in a DoS condition.
Una vulnerabilidad en el algoritmo de análisis del correo electrónico del software Cisco AsyncOS para Cisco Email Security Appliance (ESA) podría permitir a un atacante remoto no autenticado llevar a cabo un ataque de denegación de servicio (DoS) contra un dispositivo afectado. Esta vulnerabilidad es debido a que la comprobación de entrada de los correos electrónicos entrantes es insuficiente. Un atacante podría explotar esta vulnerabilidad mediante el envío de un correo electrónico diseñado mediante Cisco ESA. Una explotación con éxito podría permitir al atacante agotar todos los recursos de CPU disponibles en un dispositivo afectado durante un período prolongado de tiempo, impidiendo que otros correos electrónicos sean procesados y dando lugar a una condición de DoS
*Credits:
N/A
CVSS Scores
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
- 2021-11-04 CVE Published
- 2024-07-19 EPSS Updated
- 2024-11-07 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-770: Allocation of Resources Without Limits or Throttling
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-esa-dos-JOm9ETfO | 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" | Asyncos Search vendor "Cisco" for product "Asyncos" | < 13.0.4 Search vendor "Cisco" for product "Asyncos" and version " < 13.0.4" | - |
Affected
| in | Cisco Search vendor "Cisco" | M170 Search vendor "Cisco" for product "M170" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | < 13.0.4 Search vendor "Cisco" for product "Asyncos" and version " < 13.0.4" | - |
Affected
| in | Cisco Search vendor "Cisco" | M190 Search vendor "Cisco" for product "M190" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | < 13.0.4 Search vendor "Cisco" for product "Asyncos" and version " < 13.0.4" | - |
Affected
| in | Cisco Search vendor "Cisco" | M380 Search vendor "Cisco" for product "M380" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | < 13.0.4 Search vendor "Cisco" for product "Asyncos" and version " < 13.0.4" | - |
Affected
| in | Cisco Search vendor "Cisco" | M390 Search vendor "Cisco" for product "M390" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | < 13.0.4 Search vendor "Cisco" for product "Asyncos" and version " < 13.0.4" | - |
Affected
| in | Cisco Search vendor "Cisco" | M390x Search vendor "Cisco" for product "M390x" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | < 13.0.4 Search vendor "Cisco" for product "Asyncos" and version " < 13.0.4" | - |
Affected
| in | Cisco Search vendor "Cisco" | M680 Search vendor "Cisco" for product "M680" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | < 13.0.4 Search vendor "Cisco" for product "Asyncos" and version " < 13.0.4" | - |
Affected
| in | Cisco Search vendor "Cisco" | M690 Search vendor "Cisco" for product "M690" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | < 13.0.4 Search vendor "Cisco" for product "Asyncos" and version " < 13.0.4" | - |
Affected
| in | Cisco Search vendor "Cisco" | M690x Search vendor "Cisco" for product "M690x" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | < 13.0.4 Search vendor "Cisco" for product "Asyncos" and version " < 13.0.4" | - |
Affected
| in | Cisco Search vendor "Cisco" | S195 Search vendor "Cisco" for product "S195" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | < 13.0.4 Search vendor "Cisco" for product "Asyncos" and version " < 13.0.4" | - |
Affected
| in | Cisco Search vendor "Cisco" | S395 Search vendor "Cisco" for product "S395" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | < 13.0.4 Search vendor "Cisco" for product "Asyncos" and version " < 13.0.4" | - |
Affected
| in | Cisco Search vendor "Cisco" | S695 Search vendor "Cisco" for product "S695" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.5.3-010 Search vendor "Cisco" for product "Asyncos" and version "13.5.3-010" | - |
Affected
| in | Cisco Search vendor "Cisco" | M170 Search vendor "Cisco" for product "M170" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.5.3-010 Search vendor "Cisco" for product "Asyncos" and version "13.5.3-010" | - |
Affected
| in | Cisco Search vendor "Cisco" | M190 Search vendor "Cisco" for product "M190" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.5.3-010 Search vendor "Cisco" for product "Asyncos" and version "13.5.3-010" | - |
Affected
| in | Cisco Search vendor "Cisco" | M380 Search vendor "Cisco" for product "M380" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.5.3-010 Search vendor "Cisco" for product "Asyncos" and version "13.5.3-010" | - |
Affected
| in | Cisco Search vendor "Cisco" | M390 Search vendor "Cisco" for product "M390" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.5.3-010 Search vendor "Cisco" for product "Asyncos" and version "13.5.3-010" | - |
Affected
| in | Cisco Search vendor "Cisco" | M390x Search vendor "Cisco" for product "M390x" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.5.3-010 Search vendor "Cisco" for product "Asyncos" and version "13.5.3-010" | - |
Affected
| in | Cisco Search vendor "Cisco" | M680 Search vendor "Cisco" for product "M680" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.5.3-010 Search vendor "Cisco" for product "Asyncos" and version "13.5.3-010" | - |
Affected
| in | Cisco Search vendor "Cisco" | M690 Search vendor "Cisco" for product "M690" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.5.3-010 Search vendor "Cisco" for product "Asyncos" and version "13.5.3-010" | - |
Affected
| in | Cisco Search vendor "Cisco" | M690x Search vendor "Cisco" for product "M690x" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.5.3-010 Search vendor "Cisco" for product "Asyncos" and version "13.5.3-010" | - |
Affected
| in | Cisco Search vendor "Cisco" | S195 Search vendor "Cisco" for product "S195" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.5.3-010 Search vendor "Cisco" for product "Asyncos" and version "13.5.3-010" | - |
Affected
| in | Cisco Search vendor "Cisco" | S395 Search vendor "Cisco" for product "S395" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.5.3-010 Search vendor "Cisco" for product "Asyncos" and version "13.5.3-010" | - |
Affected
| in | Cisco Search vendor "Cisco" | S695 Search vendor "Cisco" for product "S695" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.7.0-093 Search vendor "Cisco" for product "Asyncos" and version "13.7.0-093" | - |
Affected
| in | Cisco Search vendor "Cisco" | M170 Search vendor "Cisco" for product "M170" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.7.0-093 Search vendor "Cisco" for product "Asyncos" and version "13.7.0-093" | - |
Affected
| in | Cisco Search vendor "Cisco" | M190 Search vendor "Cisco" for product "M190" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.7.0-093 Search vendor "Cisco" for product "Asyncos" and version "13.7.0-093" | - |
Affected
| in | Cisco Search vendor "Cisco" | M380 Search vendor "Cisco" for product "M380" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.7.0-093 Search vendor "Cisco" for product "Asyncos" and version "13.7.0-093" | - |
Affected
| in | Cisco Search vendor "Cisco" | M390 Search vendor "Cisco" for product "M390" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.7.0-093 Search vendor "Cisco" for product "Asyncos" and version "13.7.0-093" | - |
Affected
| in | Cisco Search vendor "Cisco" | M390x Search vendor "Cisco" for product "M390x" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.7.0-093 Search vendor "Cisco" for product "Asyncos" and version "13.7.0-093" | - |
Affected
| in | Cisco Search vendor "Cisco" | M680 Search vendor "Cisco" for product "M680" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.7.0-093 Search vendor "Cisco" for product "Asyncos" and version "13.7.0-093" | - |
Affected
| in | Cisco Search vendor "Cisco" | M690 Search vendor "Cisco" for product "M690" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.7.0-093 Search vendor "Cisco" for product "Asyncos" and version "13.7.0-093" | - |
Affected
| in | Cisco Search vendor "Cisco" | M690x Search vendor "Cisco" for product "M690x" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.7.0-093 Search vendor "Cisco" for product "Asyncos" and version "13.7.0-093" | - |
Affected
| in | Cisco Search vendor "Cisco" | S195 Search vendor "Cisco" for product "S195" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.7.0-093 Search vendor "Cisco" for product "Asyncos" and version "13.7.0-093" | - |
Affected
| in | Cisco Search vendor "Cisco" | S395 Search vendor "Cisco" for product "S395" | - | - |
Safe
|
| Cisco Search vendor "Cisco" | Asyncos Search vendor "Cisco" for product "Asyncos" | 13.7.0-093 Search vendor "Cisco" for product "Asyncos" and version "13.7.0-093" | - |
Affected
| in | Cisco Search vendor "Cisco" | S695 Search vendor "Cisco" for product "S695" | - | - |
Safe
|