Asterisk: SIP responses expose valid usernames (AST-2009-008)
Published Nov 10, 2009
5.0
MEDIUMCVSS 2.0
EPSS 4.20%
Description
Asterisk Open Source 1.2.x before 1.2.35, 1.4.x before 1.4.26.3, 1.6.0.x before 1.6.0.17, and 1.6.1.x before 1.6.1.9; Business Edition A.x.x, B.x.x before B.2.5.12, C.2.x.x before C.2.4.5, and C.3.x.x before C.3.2.2; AsteriskNOW 1.5; and s800i 1.3.x before 1.3.0.5 generate different error messages depending on whether a SIP username is valid, which allows remote attackers to enumerate valid usernames via multiple crafted REGISTER messages with inconsistent usernames in the URI in the To header and the Digest in the Authorization header.
Affected products
No data.
Configuration 1
- 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
- 1.2.10
- 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
- 1.2.15
- 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
- 1.2.27
- 1.2.28
- 1.2.28.1
- 1.2.29
- 1.2.30
- 1.2.30.1
- 1.2.30.2
- 1.2.30.3
- 1.2.30.4
- 1.2.31
- 1.2.31.1
- 1.2.32
- 1.2.33
- 1.2.34
- 1.4.0
- 1.4.0
- 1.4.0
- 1.4.0
- 1.4.0
- 1.4.1
- 1.4.2
- 1.4.3
- 1.4.4
- 1.4.5
- 1.4.6
- 1.4.7
- 1.4.7.1
- 1.4.8
- 1.4.9
- 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
- 1.4.19
- 1.4.19
- 1.4.19
- 1.4.19
- 1.4.19
- 1.4.19.1
- 1.4.19.2
- 1.4.20
- 1.4.20
- 1.4.20
- 1.4.20
- 1.4.20.1
- 1.4.21
- 1.4.21
- 1.4.21
- 1.4.21.1
- 1.4.21.2
- 1.4.22
- 1.4.22
- 1.4.22
- 1.4.22
- 1.4.22
- 1.4.22
- 1.4.22.1
- 1.4.22.2
- 1.4.23
- 1.4.23
- 1.4.23
- 1.4.23
- 1.4.23
- 1.4.23.1
- 1.4.23.2
- 1.4.24
- 1.4.24
- 1.4.24.1
- 1.4.25
- 1.4.25
- 1.4.25.1
- 1.4.26
- 1.4.26
- 1.4.26
- 1.4.26
- 1.4.26
- 1.4.26
- 1.4.26
- 1.4.26.1
- 1.4.26.2
- 1.6.0
- 1.6.0
- 1.6.0
- 1.6.0
- 1.6.0
- 1.6.0
- 1.6.0
- 1.6.0
- 1.6.0
- 1.6.0
- 1.6.0
- 1.6.0
- 1.6.0
- 1.6.0
- 1.6.0.1
- 1.6.0.2
- 1.6.0.3
- 1.6.0.3
- 1.6.0.4
- 1.6.0.5
- 1.6.0.6
- 1.6.0.7
- 1.6.0.8
- 1.6.0.9
- 1.6.0.10
- 1.6.0.11
- 1.6.0.11
- 1.6.0.11
- 1.6.0.14
- 1.6.0.14
- 1.6.0.15
- 1.6.0.16
- 1.6.0.16
- 1.6.0.16
- 1.6.1.0
- 1.6.1.0
- 1.6.1.0
- 1.6.1.0
- 1.6.1.0
- 1.6.1.1
- 1.6.1.2
- 1.6.1.3
- 1.6.1.4
- 1.6.1.5
- 1.6.1.5
- 1.6.1.6
- 1.6.1.7
- 1.6.1.7
- 1.6.1.8
- 1.6.1.10
- 1.6.1.10
Configuration 2
- 1.5
Configuration 3
Configuration 4
- a
- b
- 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.2.3.5
- b.2.3.6
- b.2.5.0
- b.2.5.1
- b.2.5.2
- b.2.5.3
- c
- c.2.3
- c.3.0
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:L/Au:N/C:P/I:N/A:N
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 2, 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 (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 4.20% (0.04201) | 90.65th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.20% (0.04201) | 89.63th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.72% (0.00720) | 70.15th | v4 (v2025.03.14) |
| Mar 29, 2025 | 7.17% (0.07165) | 85.63th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.72% (0.00720) | 70.79th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.30% (0.01303) | 86.46th | v3 (v2023.03.01) |
| May 3, 2024 | 1.30% (0.01303) | 85.78th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.30% (0.01303) | 83.75th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.17% (0.02172) | 80.77th | v2 (v2022.01.01) |
| Feb 13, 2023 | 2.17% (0.02172) | 80.28th | v2 (v2022.01.01) |
| Feb 3, 2023 | 3.78% (0.03779) | 85.12th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.17% (0.02172) | 78.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.17% (0.02172) | 57.73th | v2 (v2022.01.01) |
References (15)
- http://downloads.asterisk.org/pub/security/AST-2009-008.html x_refsource_CONFIRMVendor Advisory
- http://osvdb.org/59697 vdb-entryx_refsource_OSVDB
- http://secunia.com/advisories/37265 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/37479 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/37677 third-party-advisoryx_refsource_SECUNIA
- http://www.debian.org/security/2009/dsa-1952 vendor-advisoryx_refsource_DEBIAN
- http://www.securityfocus.com/bid/36924 vdb-entryx_refsource_BIDPatch
- http://www.securitytracker.com/id?1023133 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/security/cve/CVE-2009-3727 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=523277 x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=533137 x_refsource_CONFIRMIssue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2009-3727
- https://www.cve.org/CVERecord?id=CVE-2009-3727
- https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00789.html vendor-advisoryx_refsource_FEDORA
- https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00838.html vendor-advisoryx_refsource_FEDORA
Change history (0)
No recorded changes yet.