CVE-2019-12657 : Vulnerability Insights and Analysis

A weakness in the Unified Threat Defense (UTD) feature of Cisco IOS XE Software allows a remote attacker to trigger a device reboot, leading to a denial of service (DoS) situation.

Understanding CVE-2019-12657

This CVE involves a vulnerability in Cisco IOS XE Software that enables unauthorized remote attackers to cause a targeted device to reboot.

What is CVE-2019-12657?

The vulnerability stems from the UTD feature inadequately validating IPv6 packets, allowing attackers to exploit this weakness by sending IPv6 traffic through a device with UTD configured.

The Impact of CVE-2019-12657

CVSS Base Score: 8.6 (High Severity)
Attack Vector: Network
Availability Impact: High
Scope: Changed
No user interaction or privileges required

Technical Details of CVE-2019-12657

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The vulnerability in UTD in Cisco IOS XE Software allows unauthenticated remote attackers to reload affected devices due to improper validation of IPv6 packets.

Affected Systems and Versions

Product: Cisco IOS XE Software 3.16.0S
Vendor: Cisco
Version: Unspecified

Exploitation Mechanism

Attackers exploit the vulnerability by sending IPv6 traffic through a device with UTD configured, forcing the device to reload and causing a DoS situation.

Mitigation and Prevention

Protecting systems from CVE-2019-12657 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor patches and updates promptly
Implement network segmentation to limit exposure
Monitor network traffic for any suspicious activity

Long-Term Security Practices

Regularly update and patch all software and firmware
Conduct security assessments and penetration testing
Educate users and IT staff on security best practices

Patching and Updates

Cisco has released patches to address this vulnerability
Regularly check for security advisories and apply updates as soon as they are available