BugZero | Cisco BugID CSCwt32138 - Incorrect Default Lifetime for IPv6 RA DNS Options

Cisco - Defect ID: CSCwt32138

Incorrect Default Lifetime for IPv6 RA DNS Options

Cisco - Defect ID: CSCwt32138

Incorrect Default Lifetime for IPv6 RA DNS Options

Last updated on February 20th, 2026

BugZero Risk Score
5.0 Medium

Overall: 5.0

Severity: 5.5

Lifecycle: 7.8

Popularity: 3.7

What is the BugZero Risk Score?

Cisco Integration

Learn more about where this data comes from

Cisco Integration

Learn more

BugZero Plan

Streamline upgrades with automated vendor bug scrubs

BugZero Plan

Learn more

BugZero Prevent

Wish you caught this bug sooner? Get proactive today.

BugZero Prevent

Learn more

Bug Details

Views: 1

Description

Symptom

The default value for DNS options in an IPv6 RA configuration is 1.5*MaxRtrAdvInterval.

Conditions

Configuring default DNS options in an IPv6 RA uses 900s instead of 1800s.

Workaround

Specify a lifetime when configuring IPv6 RA DNS Options.

Further Problem Description

Change history

2026-02-20 Added: 10.6(2)

Top Cisco Defects

9.7Defect ID: CSCwq31287
Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability
9.7Defect ID: CSCwj74769
After [non]pairwise key enabling and reboot, bfd ip and port mismatch on device.
9.7Defect ID: CSCwt50498
Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
9.7Defect ID: CSCws61409
Live Logs Not Displaying on GUI Due to Fast Expansion of MNT Database
9.7Defect ID: CSCwe44571
FMC: GEOLOCATION size is causing upgrade failures

Ready to prevent the next vendor outage?

Get a demo

Cisco - Defect ID: CSCwt32138

Incorrect Default Lifetime for IPv6 RA DNS Options

Cisco - Defect ID: CSCwt32138

Incorrect Default Lifetime for IPv6 RA DNS Options

Last updated on February 20th, 2026

BugZero Risk Score5.0 Medium

Bug Details

Symptom

Conditions

Workaround

Further Problem Description

Links

Top Cisco Defects

Ready to prevent the next vendor outage?

BugZero Risk Score
5.0 Medium