CVE-2020-28361

Kamailio before 5.4.0, as used in Sip Express Router (SER) in Sippy Softswitch 4.5 through 5.2 and other products, allows a bypass of a header-removal protection mechanism via whitespace characters. This occurs in the remove_hf function in the Kamailio textops module. Particular use of remove_hf in Sippy Softswitch may allow skilled attacker having a valid credential in the system to disrupt internal call start/duration accounting mechanisms leading potentially to a loss of revenue.

• CWE-444

• https://packetstormsecurity.com/files/159030/Kamailio-5.4.0-Header-Smuggling.htmlExploit, Third Party Advisory, VDB Entry
• https://support.sippysoft.com/support/discussions/topics/3000179616Permissions Required
• https://packetstormsecurity.com/files/159030/Kamailio-5.4.0-Header-Smuggling.htmlExploit, Third Party Advisory, VDB Entry
• https://support.sippysoft.com/support/discussions/topics/3000179616Permissions Required

Published

Nov 18, 2020

Last Modified

Jun 17, 2026

Status

Modified

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