MEDIUM
The SIP over UDP implementation in Asterisk Open Source 1.4.x before 1.4.43, 1.6.x before 1.6.2.21, and 1.8.x before 1.8.7.2 uses different port numbers for responses to invalid requests depending on whether a SIP username exists, which allows remote attackers to enumerate usernames via a series of requests
Published Dec 15, 2011
5.0
MEDIUMCVSS 2.0
EPSS 3.16%
Description
The SIP over UDP implementation in Asterisk Open Source 1.4.x before 1.4.43, 1.6.x before 1.6.2.21, and 1.8.x before 1.8.7.2 uses different port numbers for responses to invalid requests depending on whether a SIP username exists, which allows remote attackers to enumerate usernames via a series of requests.
Affected products
No data.
Configuration 1
OR
- 1.8.0
- 1.8.0
- 1.8.0
- 1.8.0
- 1.8.0
- 1.8.0
- 1.8.0
- 1.8.0
- 1.8.0
- 1.8.0
- 1.8.1
- 1.8.1
- 1.8.1.1
- 1.8.1.2
- 1.8.2
- 1.8.2.1
- 1.8.2.2
- 1.8.2.3
- 1.8.2.4
- 1.8.3
- 1.8.3
- 1.8.3
- 1.8.3
- 1.8.3.1
- 1.8.3.2
- 1.8.3.3
- 1.8.4
- 1.8.4
- 1.8.4
- 1.8.4
- 1.8.4.1
- 1.8.4.2
- 1.8.4.3
- 1.8.4.4
- 1.8.5
- 1.8.5
- 1.8.5.0
- 1.8.6.0
- 1.8.6.0
- 1.8.6.0
- 1.8.6.0
- 1.8.7.0
- 1.8.7.0
- 1.8.7.0
- 1.8.7.1
Configuration 2
OR
- 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
- 1.6.2.19
- 1.6.2.19
- 1.6.2.20
- 1.6.2.21
Configuration 3
OR
- 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
- 1.4.42
- 1.4.42
- 1.4.42
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.
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:P/I:N/A:N
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact None
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
3.16% 0.03158
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.03158
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 | 3.16% (0.03158) | 87.52th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.28% (0.03277) | 86.77th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.69% (0.00685) | 69.35th | v4 (v2025.03.14) |
| Mar 29, 2025 | 4.47% (0.04472) | 81.44th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.69% (0.00685) | 70.00th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.16% (0.01159) | 85.52th | v3 (v2023.03.01) |
| Apr 16, 2024 | 1.16% (0.01159) | 84.68th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.16% (0.01159) | 82.67th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.41% (0.01408) | 72.89th | v2 (v2022.01.01) |
| Mar 2, 2023 | 1.41% (0.01408) | 72.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.41% (0.01408) | 70.87th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.41% (0.01408) | 49.94th | v2 (v2022.01.01) |
Weaknesses (1)
References (8)
- http://archives.neohapsis.com/archives/bugtraq/2011-12/0151.html mailing-listx_refsource_BUGTRAQ
- http://downloads.asterisk.org/pub/security/AST-2011-013.html x_refsource_CONFIRM
- http://lists.digium.com/pipermail/asterisk-dev/2011-November/052191.html mailing-listx_refsource_MLIST
- http://openwall.com/lists/oss-security/2011/12/09/3 mailing-listx_refsource_MLIST
- http://openwall.com/lists/oss-security/2011/12/09/4 mailing-listx_refsource_MLIST
- http://osvdb.org/77597 vdb-entryx_refsource_OSVDB
- http://secunia.com/advisories/47273 third-party-advisoryx_refsource_SECUNIA
- http://www.debian.org/security/2011/dsa-2367 vendor-advisoryx_refsource_DEBIAN
| Link | Providers | Tags |
|---|---|---|
| http://archives.neohapsis.com/archives/bugtraq/2011-12/0151.html | mailing-listx_refsource_BUGTRAQ | |
| http://downloads.asterisk.org/pub/security/AST-2011-013.html | x_refsource_CONFIRM | |
| http://lists.digium.com/pipermail/asterisk-dev/2011-November/052191.html | mailing-listx_refsource_MLIST | |
| http://openwall.com/lists/oss-security/2011/12/09/3 | mailing-listx_refsource_MLIST | |
| http://openwall.com/lists/oss-security/2011/12/09/4 | mailing-listx_refsource_MLIST | |
| http://osvdb.org/77597 | vdb-entryx_refsource_OSVDB | |
| http://secunia.com/advisories/47273 | third-party-advisoryx_refsource_SECUNIA | |
| http://www.debian.org/security/2011/dsa-2367 | vendor-advisoryx_refsource_DEBIAN |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner redhat
Published Dec 15, 2011
Updated Aug 7, 2024
Reserved Nov 29, 2011
Link CVE-2011-4597
CISA Vulnrichment
Updated n/a