// For flags

CVE-2019-12655

Cisco IOS XE Software FTP Application Layer Gateway for NAT, NAT64, and ZBFW 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 FTP application layer gateway (ALG) functionality used by Network Address Translation (NAT), NAT IPv6 to IPv4 (NAT64), and the Zone-Based Policy Firewall (ZBFW) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a buffer overflow that occurs when an affected device inspects certain FTP traffic. An attacker could exploit this vulnerability by performing a specific FTP transfer through the device. A successful exploit could allow the attacker to cause the device to reload.

Una vulnerabilidad en la funcionalidad application layer gateway (ALG) de FTP, utilizada por Network Address Translation (NAT), NAT IPv6 a IPv4 (NAT64) y el Zone-Based Policy Firewall (ZBFW) en Software Cisco IOS XE, podría permitir a un atacante remoto no autenticado causar que un dispositivo afectado se recargue. La vulnerabilidad es debido a un desbordamiento de búfer que ocurre cuando un dispositivo afectado inspecciona determinado tráfico FTP. Un atacante podría explotar esta vulnerabilidad realizando una transferencia FTP específica por medio del dispositivo. Una explotación con éxito podría permitir al atacante causar que el dispositivo se recargue.

*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
Low
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:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2019-06-04 CVE Reserved
  • 2019-09-25 CVE Published
  • 2023-03-07 EPSS Updated
  • 2024-11-19 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-20: Improper Input Validation
  • CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Cisco
Search vendor "Cisco"
 Ios
Search vendor "Cisco" for product "Ios"
 >= 3.16.8s < 16.3.8
Search vendor "Cisco" for product "Ios" and version " >= 3.16.8s < 16.3.8"
-
Affected
Cisco
Search vendor "Cisco"
 Ios
Search vendor "Cisco" for product "Ios"
 >= 16.10.1 < 16.11.1
Search vendor "Cisco" for product "Ios" and version " >= 16.10.1 < 16.11.1"
-
Affected
Cisco
Search vendor "Cisco"
 Ios
Search vendor "Cisco" for product "Ios"
 16.6.4
Search vendor "Cisco" for product "Ios" and version "16.6.4"
-
Affected
Cisco
Search vendor "Cisco"
 Ios
Search vendor "Cisco" for product "Ios"
 16.6.5
Search vendor "Cisco" for product "Ios" and version "16.6.5"
-
Affected
Cisco
Search vendor "Cisco"
 Ios
Search vendor "Cisco" for product "Ios"
 16.9.1
Search vendor "Cisco" for product "Ios" and version "16.9.1"
-
Affected
Cisco
Search vendor "Cisco"
 Ios
Search vendor "Cisco" for product "Ios"
 16.9.2
Search vendor "Cisco" for product "Ios" and version "16.9.2"
-
Affected