Bug ID 482436: BIG-IP processing of invalid SIP request may result in high CPU utilization

Last Modified: Jan 07, 2026

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
11.5.1, 11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.1 HF10, 11.5.1 HF11, 11.5.2, 11.5.2 HF1, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4

Fixed In:
12.0.0, 11.6.0 HF5, 11.5.3

Opened: Oct 02, 2014

Severity: 2-Critical

Related Article: K16973

Symptoms

See SOL16973: BIG-IP processing of invalid SIP request may result in high CPU utilization, available here: https://support.f5.com/kb/en-us/solutions/public/16000/900/sol16973.html.

Impact

See SOL16973: BIG-IP processing of invalid SIP request may result in high CPU utilization, available here: https://support.f5.com/kb/en-us/solutions/public/16000/900/sol16973.html.

Conditions

See SOL16973: BIG-IP processing of invalid SIP request may result in high CPU utilization, available here: https://support.f5.com/kb/en-us/solutions/public/16000/900/sol16973.html.

Workaround

None

Fix Information

See SOL16973: BIG-IP processing of invalid SIP request may result in high CPU utilization, available here: https://support.f5.com/kb/en-us/solutions/public/16000/900/sol16973.html.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips