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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…
Medium5.0EPSS 4.2%
- Published
- Updated
- Reserved
- Assigned by
- redhat
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
- EPSS (exploitation in 30 days)
- 4.2% · top 9.0% of all CVEs (5 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.0.
Weakness
Affected products
n/a
- affected n/a
References (12)
- 37265 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- FEDORA-2009-11126 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- 37479 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- 37677 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- DSA-1952 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=523277 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=533137 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 36924 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- FEDORA-2009-11070 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- 59697 (opens in a new tab)vdb-entryx_refsource_OSVDBx_transferred
- http://downloads.asterisk.org/pub/security/AST-2009-008.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- 1023133 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2009-3727)Record last updated .