The default configuration of the SIP channel driver in Asterisk Open Source 1.4.x through 1.4.41.2 and 1.6.2.x through 1.6.2.18.2 does not enable the alwaysauthreject option, which allows remote attackers to enumerate account names by making a series of invalid SIP requests and observing the differences in the responses for different usernames, a different vulnerability than CVE-2011-2536
Published Jul 6, 2011
5.0
MEDIUMCVSS 2.0
EPSS 1.33%
Description
The default configuration of the SIP channel driver in Asterisk Open Source 1.4.x through 1.4.41.2 and 1.6.2.x through 1.6.2.18.2 does not enable the alwaysauthreject option, which allows remote attackers to enumerate account names by making a series of invalid SIP requests and observing the differences in the responses for different usernames, a different vulnerability than CVE-2011-2536.
Affected products
No data.
Configuration 1
- 1.6.2.0
- 1.6.2.0
- 1.6.2.0
- 1.6.2.0
- 1.6.2.0
- 1.6.2.0
- 1.6.2.0
- 1.6.2.0
- 1.6.2.1
- 1.6.2.1
- 1.6.2.2
- 1.6.2.3
- 1.6.2.4
- 1.6.2.5
- 1.6.2.6
- 1.6.2.6
- 1.6.2.6
- 1.6.2.15
- 1.6.2.16
- 1.6.2.16
- 1.6.2.16.1
- 1.6.2.16.2
- 1.6.2.17
- 1.6.2.17
- 1.6.2.17
- 1.6.2.17
- 1.6.2.17.1
- 1.6.2.17.2
- 1.6.2.17.3
- 1.6.2.18
- 1.6.2.18
- 1.6.2.18.1
- 1.6.2.18.2
Configuration 2
- 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
- 1.4.26.3
- 1.4.27
- 1.4.27
- 1.4.27
- 1.4.27
- 1.4.27
- 1.4.27
- 1.4.27.1
- 1.4.28
- 1.4.28
- 1.4.29
- 1.4.29
- 1.4.29.1
- 1.4.30
- 1.4.30
- 1.4.30
- 1.4.31
- 1.4.31
- 1.4.31
- 1.4.32
- 1.4.32
- 1.4.33
- 1.4.33
- 1.4.33
- 1.4.33.1
- 1.4.34
- 1.4.34
- 1.4.34
- 1.4.35
- 1.4.35
- 1.4.36
- 1.4.36
- 1.4.37
- 1.4.37
- 1.4.38
- 1.4.38
- 1.4.39
- 1.4.39
- 1.4.39.1
- 1.4.39.2
- 1.4.40
- 1.4.40
- 1.4.40
- 1.4.40
- 1.4.40.1
- 1.4.40.2
- 1.4.41
- 1.4.41
- 1.4.41.1
- 1.4.41.2
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 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 (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.33% (0.01329) | 69.99th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.33% (0.01329) | 67.22th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.59% (0.00590) | 66.64th | v4 (v2025.03.14) |
| Mar 29, 2025 | 3.88% (0.03883) | 80.13th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.59% (0.00590) | 67.30th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.36% (0.00357) | 72.97th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.36% (0.00357) | 71.31th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.36% (0.00357) | 67.66th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.05% (0.01055) | 50.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.05% (0.01055) | 48.43th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.05% (0.01055) | 27.52th | v2 (v2022.01.01) |
References (2)
- http://downloads.asterisk.org/pub/security/AST-2011-011.html x_refsource_CONFIRMVendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/68472 vdb-entryx_refsource_XF
| Link | Providers | Tags |
|---|---|---|
| http://downloads.asterisk.org/pub/security/AST-2011-011.html | x_refsource_CONFIRMVendor Advisory | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/68472 | vdb-entryx_refsource_XF |
Change history (0)
No recorded changes yet.