CVE-2009-3727
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.
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
- 4.2% (91th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2009-3699)
- Published
- November 10, 2009
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2009-3699 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
- digium / asterisk
- digium / asterisk
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- digium / asterisk
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- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
- digium / asterisk
and 165 more…
References
- http://downloads.asterisk.org/pub/security/AST-2009-008.html(Vendor Advisory)
- http://osvdb.org/59697
- http://secunia.com/advisories/37265(Vendor Advisory)
- http://secunia.com/advisories/37479
- http://secunia.com/advisories/37677
- http://www.debian.org/security/2009/dsa-1952
- http://www.securityfocus.com/bid/36924(Patch)
- http://www.securitytracker.com/id?1023133
- https://bugzilla.redhat.com/show_bug.cgi?id=523277
- https://bugzilla.redhat.com/show_bug.cgi?id=533137
- https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00789.html
- https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00838.html
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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