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.
Conclusion & alert: CVE-2008-1897 is rated Moderate Risk (46.4/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.74%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 3.05% | 2.74% | -0.31% |
| 2 | 2025-11-05 | 3.48% | 3.05% | -0.43% |
| 3 | 2025-09-17 | — | 3.48% | — |
Full EPSS history (19 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 4.3 | 2.0 | MEDIUM |
|
8.6 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
medium | CVE-2008-1897 medium priority: Debian including 1 source packages (asterisk), 2 status rows across 2 suites (bullseye, sid): resolved 2. | https://security-tracker.debian.org/tracker/CVE-2008-1897 |
gentoo
|
normal | CVE-2008-1897: 1 GLSA(s) (200905-01), 1 atom(s) (net-misc/asterisk); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2008-1897 |
redhat
|
— | — | https://access.redhat.com/security/cve/CVE-2008-1897 |
ubuntu
|
medium | CVE-2008-1897 medium priority: Ubuntu including 1 source packages (asterisk), 8 status rows across 8 suites (dapper, feisty, gutsy, hardy, intrepid, jaunty, karmic, upstream): ignored 3, not-affected 3, released 2. | https://ubuntu.com/security/CVE-2008-1897 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| asterisk | asterisk_appliance_developer_kit | 0.2 | cpe:2.3:a:asterisk:asterisk_appliance_developer_kit:0.2:*:*:*:*:*:*:* |
| asterisk | asterisk_appliance_developer_kit | 0.3 | cpe:2.3:a:asterisk:asterisk_appliance_developer_kit:0.3:*:*:*:*:*:*:* |
| asterisk | asterisk_appliance_developer_kit | 0.4 | cpe:2.3:a:asterisk:asterisk_appliance_developer_kit:0.4:*:*:*:*:*:*:* |
| asterisk | asterisk_appliance_developer_kit | 0.5 | cpe:2.3:a:asterisk:asterisk_appliance_developer_kit:0.5:*:*:*:*:*:*:* |
| asterisk | asterisk_appliance_developer_kit | 0.6 | cpe:2.3:a:asterisk:asterisk_appliance_developer_kit:0.6:*:*:*:*:*:*:* |
| asterisk | asterisk_appliance_developer_kit | 0.6.0 | cpe:2.3:a:asterisk:asterisk_appliance_developer_kit:0.6.0:*:*:*:*:*:*:* |
| asterisk | asterisk_appliance_developer_kit | 0.7 | cpe:2.3:a:asterisk:asterisk_appliance_developer_kit:0.7:*:*:*:*:*:*:* |
| asterisk | asterisk_appliance_developer_kit | 0.8 | cpe:2.3:a:asterisk:asterisk_appliance_developer_kit:0.8:*:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | <= b.2.5.1 | cpe:2.3:a:asterisk:asterisk_business_edition:*:*:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | <= c1.8.0 | cpe:2.3:a:asterisk:asterisk_business_edition:*:*:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | a | cpe:2.3:a:asterisk:asterisk_business_edition:a:*:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | b.1.3.2 | cpe:2.3:a:asterisk:asterisk_business_edition:b.1.3.2:*:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | b.1.3.3 | cpe:2.3:a:asterisk:asterisk_business_edition:b.1.3.3:*:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | b.2.2.0 | cpe:2.3:a:asterisk:asterisk_business_edition:b.2.2.0:*:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | b.2.2.1 | cpe:2.3:a:asterisk:asterisk_business_edition:b.2.2.1:*:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | b.2.3.1 | cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.1:*:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | b.2.3.2 | cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.2:*:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | b.2.3.3 | cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.3:*:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | b.2.3.4 | cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.4:*:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | b.2.3.6 | cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.6:*:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | b.2.5.0 | cpe:2.3:a:asterisk:asterisk_business_edition:b.2.5.0:*:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | c.1.0 | cpe:2.3:a:asterisk:asterisk_business_edition:c.1.0:beta7:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | c.1.0 | cpe:2.3:a:asterisk:asterisk_business_edition:c.1.0:beta8:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | c.1.6 | cpe:2.3:a:asterisk:asterisk_business_edition:c.1.6:*:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | c.1.6.1 | cpe:2.3:a:asterisk:asterisk_business_edition:c.1.6.1:*:*:*:*:*:*:* |
| asterisk | asterisk_business_edition | c.1.6.2 | cpe:2.3:a:asterisk:asterisk_business_edition:c.1.6.2:*:*:*:*:*:*:* |
| asterisk | asterisknow | <= 1.0.2 | cpe:2.3:a:asterisk:asterisknow:*:*:*:*:*:*:*:* |
| asterisk | asterisknow | 1.0 | cpe:2.3:a:asterisk:asterisknow:1.0:*:*:*:*:*:*:* |
| asterisk | asterisknow | 1.0.1 | cpe:2.3:a:asterisk:asterisknow:1.0.1:*:*:*:*:*:*:* |
| asterisk | open_source | <= 1.2.27 | cpe:2.3:a:asterisk:open_source:*:*:*:*:*:*:*:* |
| asterisk | open_source | <= 1.4.19 | cpe:2.3:a:asterisk:open_source:*:*:*:*:*:*:*:* |
| asterisk | open_source | 1.0 | cpe:2.3:a:asterisk:open_source:1.0:*:*:*:*:*:*:* |
| asterisk | open_source | 1.0 | cpe:2.3:a:asterisk:open_source:1.0:rc1:*:*:*:*:*:* |
| asterisk | open_source | 1.0 | cpe:2.3:a:asterisk:open_source:1.0:rc2:*:*:*:*:*:* |
| asterisk | open_source | 1.0.0 | cpe:2.3:a:asterisk:open_source:1.0.0:*:*:*:*:*:*:* |
| asterisk | open_source | 1.0.1 | cpe:2.3:a:asterisk:open_source:1.0.1:*:*:*:*:*:*:* |
| asterisk | open_source | 1.0.2 | cpe:2.3:a:asterisk:open_source:1.0.2:*:*:*:*:*:*:* |
| asterisk | open_source | 1.0.3 | cpe:2.3:a:asterisk:open_source:1.0.3:*:*:*:*:*:*:* |
| asterisk | open_source | 1.0.3.4 | cpe:2.3:a:asterisk:open_source:1.0.3.4:*:*:*:*:*:*:* |
| asterisk | open_source | 1.0.4 | cpe:2.3:a:asterisk:open_source:1.0.4:*:*:*:*:*:*:* |
| asterisk | open_source | 1.0.5 | cpe:2.3:a:asterisk:open_source:1.0.5:*:*:*:*:*:*:* |
| asterisk | open_source | 1.0.6 | cpe:2.3:a:asterisk:open_source:1.0.6:*:*:*:*:*:*:* |
| asterisk | open_source | 1.0.7 | cpe:2.3:a:asterisk:open_source:1.0.7:*:*:*:*:*:*:* |
| asterisk | open_source | 1.0.8 | cpe:2.3:a:asterisk:open_source:1.0.8:*:*:*:*:*:*:* |
| asterisk | open_source | 1.0.9 | cpe:2.3:a:asterisk:open_source:1.0.9:*:*:*:*:*:*:* |
| asterisk | open_source | 1.0.11 | cpe:2.3:a:asterisk:open_source:1.0.11:*:*:*:*:*:*:* |
| asterisk | open_source | 1.0.11 | cpe:2.3:a:asterisk:open_source:1.0.11:patch:*:*:*:*:*:* |
| asterisk | open_source | 1.0.11.1 | cpe:2.3:a:asterisk:open_source:1.0.11.1:*:*:*:*:*:*:* |
| asterisk | open_source | 1.0.11.1 | cpe:2.3:a:asterisk:open_source:1.0.11.1:patch:*:*:*:*:*:* |
| asterisk | open_source | 1.0.12 | cpe:2.3:a:asterisk:open_source:1.0.12:*:*:*:*:*:*:* |
| asterisk | open_source | 1.0.12 | cpe:2.3:a:asterisk:open_source:1.0.12:patch:*:*:*:*:*:* |
| asterisk | open_source | 1.2.0 | cpe:2.3:a:asterisk:open_source:1.2.0:*:*:*:*:*:*:* |
| asterisk | open_source | 1.2.0 | cpe:2.3:a:asterisk:open_source:1.2.0:beta1:*:*:*:*:*:* |
| asterisk | open_source | 1.2.0 | cpe:2.3:a:asterisk:open_source:1.2.0:beta2:*:*:*:*:*:* |
| asterisk | open_source | 1.2.0 | cpe:2.3:a:asterisk:open_source:1.2.0:rc1:*:*:*:*:*:* |
| asterisk | open_source | 1.2.0 | cpe:2.3:a:asterisk:open_source:1.2.0:rc2:*:*:*:*:*:* |
| asterisk | open_source | 1.2.1 | cpe:2.3:a:asterisk:open_source:1.2.1:*:*:*:*:*:*:* |
| asterisk | open_source | 1.2.2 | cpe:2.3:a:asterisk:open_source:1.2.2:*:*:*:*:*:*:* |
| asterisk | open_source | 1.2.2 | cpe:2.3:a:asterisk:open_source:1.2.2:netsec:*:*:*:*:*:* |
| asterisk | open_source | 1.2.3 | cpe:2.3:a:asterisk:open_source:1.2.3:*:*:*:*:*:*:* |
| asterisk | open_source | 1.2.3 | cpe:2.3:a:asterisk:open_source:1.2.3:netsec:*:*:*:*:*:* |
| asterisk | open_source | 1.2.4 | cpe:2.3:a:asterisk:open_source:1.2.4:*:*:*:*:*:*:* |
| asterisk | open_source | 1.2.4 | cpe:2.3:a:asterisk:open_source:1.2.4:netsec:*:*:*:*:*:* |
| asterisk | open_source | 1.2.5 | cpe:2.3:a:asterisk:open_source:1.2.5:*:*:*:*:*:*:* |
| asterisk | open_source | 1.2.5 | cpe:2.3:a:asterisk:open_source:1.2.5:netsec:*:*:*:*:*:* |
| asterisk | open_source | 1.2.6 | cpe:2.3:a:asterisk:open_source:1.2.6:*:*:*:*:*:*:* |
| asterisk | open_source | 1.2.6 | cpe:2.3:a:asterisk:open_source:1.2.6:netsec:*:*:*:*:*:* |
| asterisk | open_source | 1.2.7 | cpe:2.3:a:asterisk:open_source:1.2.7:*:*:*:*:*:*:* |
| asterisk | open_source | 1.2.7 | cpe:2.3:a:asterisk:open_source:1.2.7:netsec:*:*:*:*:*:* |
| asterisk | open_source | 1.2.7.1 | cpe:2.3:a:asterisk:open_source:1.2.7.1:*:*:*:*:*:*:* |
| asterisk | open_source | 1.2.7.1 | cpe:2.3:a:asterisk:open_source:1.2.7.1:netsec:*:*:*:*:*:* |
| asterisk | open_source | 1.2.8 | cpe:2.3:a:asterisk:open_source:1.2.8:*:*:*:*:*:*:* |
| asterisk | open_source | 1.2.8 | cpe:2.3:a:asterisk:open_source:1.2.8:netsec:*:*:*:*:*:* |
| asterisk | open_source | 1.2.9 | cpe:2.3:a:asterisk:open_source:1.2.9:*:*:*:*:*:*:* |
| asterisk | open_source | 1.2.9.1 | cpe:2.3:a:asterisk:open_source:1.2.9.1:*:*:*:*:*:*:* |
| asterisk | open_source | 1.2.9.1 | cpe:2.3:a:asterisk:open_source:1.2.9.1:netsec:*:*:*:*:*:* |
| asterisk | open_source | 1.2.10 | cpe:2.3:a:asterisk:open_source:1.2.10:*:*:*:*:*:*:* |
| asterisk | open_source | 1.2.10 | cpe:2.3:a:asterisk:open_source:1.2.10:netsec:*:*:*:*:*:* |
| asterisk | open_source | 1.2.11 | cpe:2.3:a:asterisk:open_source:1.2.11:*:*:*:*:*:*:* |
| asterisk | open_source | 1.2.11 | cpe:2.3:a:asterisk:open_source:1.2.11:netsec:*:*:*:*:*:* |