CVE-2019-1751 Explained : Impact and Mitigation
Learn about CVE-2019-1751, a Cisco IOS Software vulnerability allowing unauthenticated attackers to cause denial of service. Find mitigation steps and patching details.
Cisco IOS Software NAT64 Denial of Service Vulnerability
Understanding CVE-2019-1751
This CVE involves a weakness in the Network Address Translation 64 (NAT64) functions of Cisco IOS Software that could be exploited by an unauthenticated attacker to cause a denial of service (DoS) situation.
What is CVE-2019-1751?
The vulnerability stems from the mishandling of specific IPv4 packet streams passing through the device, potentially leading to an interface queue wedge or device reload when exploited by a targeted attacker.
The Impact of CVE-2019-1751
- CVSS Base Score: 8.6 (High Severity)
- Attack Vector: Network
- Availability Impact: High
- Successful exploitation could result in a DoS scenario by causing an interface queue wedge or device reload.
Technical Details of CVE-2019-1751
The following technical details provide insight into the vulnerability.
Vulnerability Description
The vulnerability in Cisco IOS Software NAT64 functions allows an attacker to disrupt device operations by sending specific IPv4 packet streams, potentially leading to a DoS situation.
Affected Systems and Versions
- Affected Product: Cisco IOS Software
- Affected Version: 15.x
Exploitation Mechanism
To exploit this vulnerability, an attacker needs to send targeted IPv4 packet streams through the device, causing either an interface queue wedge or device reload.
Mitigation and Prevention
Taking immediate steps and implementing long-term security practices are crucial to mitigate the risks associated with CVE-2019-1751.
Immediate Steps to Take
- Apply vendor-provided patches or updates promptly.
- Monitor network traffic for any suspicious activity.
- Implement firewall rules to restrict unauthorized access.
Long-Term Security Practices
- Regularly update and patch all software and firmware.
- Conduct security assessments and penetration testing regularly.
- Educate users and IT staff on security best practices.
Patching and Updates
- Cisco has released patches to address this vulnerability. Ensure timely installation of these patches to secure affected systems.