CVE-2020-28361

Publication date 18 November 2020

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
kamailio	25.04 plucky	Not affected
	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	23.10 mantic	Ignored end of life, was needs-triage
	23.04 lunar	Ignored end of life, was needs-triage
	22.10 kinetic	Ignored end of life, was needs-triage
	22.04 LTS jammy	Not affected
	21.10 impish	Ignored end of life
	21.04 hirsute	Ignored end of life
	20.10 groovy	Not affected
	20.04 LTS focal	Fixed 5.3.2-1ubuntu0.1~esm2
	18.04 LTS bionic	Fixed 5.1.2-1ubuntu2+esm2
	16.04 LTS xenial	Ignored changes too intrusive
	14.04 LTS trusty	Not in release

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Severity score breakdown

Parameter	Value
Base score	5.4 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

References

Related Ubuntu Security Notices (USN)

USN-7416-1
Kamailio vulnerabilities
7 April 2025