asterisk: 3-way handshake in IAX2 incomplete (CVE-2008-1923)
Published Apr 23, 2008
4.3
MEDIUMCVSS 2.0
EPSS 2.74%
Description
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
No data.
- 0.2
- 0.3
- 0.4
- 0.5
- 0.6
- 0.6.0
- 0.7
- 0.8
- ≤ b.2.5.1
- ≤ c1.8.0
- a
- b.1.3.2
- b.1.3.3
- b.2.2.0
- b.2.2.1
- b.2.3.1
- b.2.3.2
- b.2.3.3
- b.2.3.4
- b.2.3.6
- b.2.5.0
- c.1.0
- c.1.0
- c.1.6
- c.1.6.1
- c.1.6.2
- ≤ 1.0.2
- 1.0
- 1.0.1
- ≤ 1.2.27
- ≤ 1.4.19
- 1.0
- 1.0
- 1.0
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.0.3.4
- 1.0.4
- 1.0.5
- 1.0.6
- 1.0.7
- 1.0.8
- 1.0.9
- 1.0.11
- 1.0.11
- 1.0.11.1
- 1.0.11.1
- 1.0.12
- 1.0.12
- 1.2.0
- 1.2.0
- 1.2.0
- 1.2.0
- 1.2.0
- 1.2.1
- 1.2.2
- 1.2.2
- 1.2.3
- 1.2.3
- 1.2.4
- 1.2.4
- 1.2.5
- 1.2.5
- 1.2.6
- 1.2.6
- 1.2.7
- 1.2.7
- 1.2.7.1
- 1.2.7.1
- 1.2.8
- 1.2.8
- 1.2.9
- 1.2.9.1
- 1.2.9.1
- 1.2.10
- 1.2.10
- 1.2.11
- 1.2.11
- 1.2.12
- 1.2.12
- 1.2.12.1
- 1.2.12.1
- 1.2.13
- 1.2.13
- 1.2.14
- 1.2.14
- 1.2.15
- 1.2.15
- 1.2.16
- 1.2.16
- 1.2.17
- 1.2.17
- 1.2.18
- 1.2.18
- 1.2.19
- 1.2.19
- 1.2.20
- 1.2.20
- 1.2.21
- 1.2.21
- 1.2.21.1
- 1.2.21.1
- 1.2.22
- 1.2.22
- 1.2.23
- 1.2.23
- 1.2.24
- 1.2.24
- 1.2.25
- 1.2.25
- 1.2.26
- 1.2.26
- 1.2.26.1
- 1.2.26.1
- 1.2.26.2
- 1.2.26.2
- 1.4.0
- 1.4.0
- 1.4.0
- 1.4.0
- 1.4.1
- 1.4.10
- 1.4.10.1
- 1.4.11
- 1.4.12
- 1.4.12.1
- 1.4.13
- 1.4.14
- 1.4.15
- 1.4.16
- 1.4.16.1
- 1.4.16.2
- 1.4.17
- 1.4.18
- 1.4.18.1
- ≤ 1.1.0.2
- 1.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.0.3.3
- 1.1.0
- 1.1.0.1
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.74% (0.02743) | 85.64th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.74% (0.02743) | 84.19th | v5 (v2026.06.15) |
| Mar 30, 2025 | 3.23% (0.03226) | 85.92th | v4 (v2025.03.14) |
| Mar 29, 2025 | 7.22% (0.07215) | 85.70th | v4 (v2025.03.14) |
| Mar 17, 2025 | 3.11% (0.03114) | 85.94th | v4 (v2025.03.14) |
| Feb 25, 2025 | 89.89% (0.89889) | 99.08th | v3 (v2023.03.01) |
| Dec 12, 2024 | 92.23% (0.92227) | 99.09th | v3 (v2023.03.01) |
| Sep 25, 2024 | 92.30% (0.92300) | 99.03th | v3 (v2023.03.01) |
| Apr 29, 2024 | 93.88% (0.93884) | 99.11th | v3 (v2023.03.01) |
| Oct 20, 2023 | 93.68% (0.93683) | 98.83th | v3 (v2023.03.01) |
| Jun 13, 2023 | 93.81% (0.93806) | 98.70th | v3 (v2023.03.01) |
| May 7, 2023 | 93.43% (0.93432) | 98.59th | v3 (v2023.03.01) |
| Mar 31, 2023 | 93.18% (0.93178) | 98.50th | v3 (v2023.03.01) |
| Mar 7, 2023 | 93.81% (0.93806) | 98.57th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.78% (0.03779) | 85.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.78% (0.03779) | 84.01th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.78% (0.03779) | 67.21th | v2 (v2022.01.01) |
References (31)
- http://bugs.digium.com/view.php?id=10078
- http://downloads.digium.com/pub/security/AST-2008-006.html
- http://secunia.com/advisories/29927 third-party-advisoryVendor Advisory
- http://secunia.com/advisories/30010 third-party-advisoryVendor Advisory
- http://secunia.com/advisories/30042 third-party-advisoryVendor Advisory
- http://secunia.com/advisories/34982 third-party-advisory
- http://security.gentoo.org/glsa/glsa-200905-01.xml vendor-advisory
- http://www.altsci.com/concepts/page.php?s=asteri&p=2
- http://www.debian.org/security/2008/dsa-1563 vendor-advisory
- http://www.securityfocus.com/archive/1/491220/100/0/threaded mailing-list
- http://www.securityfocus.com/bid/28901 vdb-entry
- http://www.securitytracker.com/id?1019918 vdb-entry
- http://www.vupen.com/english/advisories/2008/1324 vdb-entry
- https://access.redhat.com/security/cve/CVE-2008-1897 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=443761 Issue Tracking
- https://downloads.asterisk.org/pub/security/AST-2008-006.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/41966 vdb-entry
- https://github.com/jcollie/asterisk/commit/60de4fbbdf3ede49f158e23a9e3b679f2e519c1e
- https://github.com/jcollie/asterisk/commit/771b3d8749b34b6eea4e03a2e514380da9582f90
- https://github.com/jcollie/asterisk/commit/a8b180875b037b8da26f6a3bcc8e5e98b8c904d2
- https://github.com/kaoru6/asterisk/commit/1fe14f38dd43dc894d21f85762b51208ba5c8acb
- https://github.com/lyx2014/Asterisk/commit/0670e43c30135044e25cca7f80e1833e2c128653
- https://github.com/mojolingo/asterisk/commit/20ac3662f137dbf7f42d5295590069a7d3b1166b
- https://github.com/pruiz/asterisk/commit/e0ef9bd22810c6969a7f222eec04798f19a7e2d6
- https://github.com/silentindark/asterisk-1/commit/fe8b7f31db687f8b9992864b82c93d22833019c7
- https://github.com/xrg/asterisk-xrg/commit/10da3dab24e8ca08cf2c983f8d0206e383535b5a
- https://github.com/xrg/asterisk-xrg/commit/51714a24347dc57f9a208a4a8af84115ef407b83
- https://nvd.nist.gov/vuln/detail/CVE-2008-1897
- https://www.cve.org/CVERecord?id=CVE-2008-1897
- https://www.redhat.com/archives/fedora-package-announce/2008-April/msg00581.html vendor-advisory
- https://www.redhat.com/archives/fedora-package-announce/2008-April/msg00600.html vendor-advisory
Change history (0)
No recorded changes yet.