CVE-2008-1897
The IAX2 channel driver (chan_iax2) in Asterisk Open Source 1.0.x, 1.2.x before 1.2.28, and 1.4.x before 1.4.19.1; Business Edition A.x.x, B.x.x before B.2.5.2, and C.x.x before C.1.8.1; AsteriskNOW before 1.0.3; Appliance Developer Kit 0.x.x; and s800i before 1.1.0.3, when configured to allow unauthenticated calls, does not verify that an ACK response contains a call number matching the server's reply to a NEW message, which allows remote attackers to cause a denial of service (traffic amplification) via a spoofed ACK response that does not complete a 3-way handshake. NOTE: this issue exists because of an incomplete fix for CVE-2008-1923.
Published:Apr 22, 2008
Last Modified:Apr 23, 2026
EPS:Apr 23, 2008
EPSS Score:0.03049
CVSS Score:4.3
Affected Products
Vendor
Product
Action
Vendor
Asterisk
Product
Asterisk Appliance Developer Kit
Asterisk
Asterisk Appliance Developer Kit
Vendor
Asterisk
Product
Asterisk Business Edition
Asterisk
Asterisk Business Edition
Vendor
Asterisk
Product
Asterisknow
Asterisk
Asterisknow
Vendor
Asterisk
Product
Open Source
Asterisk
Open Source
Vendor
Asterisk
Product
S800i
Asterisk
S800i
Exploits
No exploit reference
Common Weakness Enumeration
Common Attack Pattern Enumeration and Classification (CAPEC)
Related CVEs
References
Common Vulnerability Scoring System
Attack Vector
Network
Adjacent
Local
Physical
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
