CVE-2011-4597
MEDIUM · CVSS 5.0EPSS 3.2%EU EUVD
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.
Key facts
- CVSS score
- 5.0 (v2.0)
- Severity
- MEDIUM
- CVSS vector
AV:N/AC:L/Au:N/C:P/I:N/A:N- Weakness (CWE)
- CWE-200
- EPSS score
- 3.2% (88th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2011-4521)
- Published
- December 15, 2011
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2011-4521 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.
View on the EU Vulnerability DatabaseAffected products
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
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- digium / asterisk
- digium / asterisk
- digium / asterisk
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- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
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- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
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- digium / asterisk
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- digium / asterisk
- digium / asterisk
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- digium / asterisk
- digium / asterisk
and 158 more…
References
- http://archives.neohapsis.com/archives/bugtraq/2011-12/0151.html
- http://downloads.asterisk.org/pub/security/AST-2011-013.html
- http://lists.digium.com/pipermail/asterisk-dev/2011-November/052191.html
- http://openwall.com/lists/oss-security/2011/12/09/3
- http://openwall.com/lists/oss-security/2011/12/09/4
- http://osvdb.org/77597
- http://secunia.com/advisories/47273
- http://www.debian.org/security/2011/dsa-2367
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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