CVE-2008-1897: Asterisk Appliance Developer Kit
Medium severity, CVSS 4.3. EPSS: 2.7% chance of exploitation in the next 30 days.
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.
Affected products
- Asterisk Asterisk Appliance Developer Kit: version 0.2 only; version 0.3 only; version 0.4 only; version 0.5 only; version 0.6 only; version 0.6.0 only; …
- Asterisk Asterisk Business Edition: up to and including b.2.5.1; up to and including c1.8.0; version a only; version b.1.3.2 only; version b.1.3.3 only; version b.2.2.0 only; …
- Asterisk Asterisknow: up to and including 1.0.2; version 1.0 only; version 1.0.1 only
- Asterisk Open Source: up to and including 1.2.27; up to and including 1.4.19; version 1.0 only; version 1.0.0 only; version 1.0.1 only; version 1.0.2 only; …
- Asterisk s800i: up to and including 1.1.0.2; version 1.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.0.3.3 only; …
Published 2008-04-23. Last modified 2026-06-16.