Bug ID 530264: Potential core with SIP whitespace between messages

Last Modified: Mar 17, 2021

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

Known Affected Versions:
10.2.4, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 11.6.2, 11.6.2 HF1, 11.6.3,,,,, 11.6.4, 11.6.5,,,

Fixed In:

Opened: Jun 27, 2015
Severity: 3-Major


Whitespace used as a keep alive between messages on TCP may produce a core within the SIP parser.


Incompatibility with some SIP clients and servers.


Some SIP clients and servers will transmit packets containing whitespace to keep a TCP connection alive. These whitespace packets are ignored by the SIP parser. In some cases, the parser may retain a reference to released data after receiving and ignoring the white space characters.



Fix Information

Fix clears references to released memory when the parser discards whitespace.

Behavior Change