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…
- 5.0MediumCVSS base score
- 4.2%Exploitation in 30 daysEPSS · top 8.9% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By redhat
- 25 days later
· 25 days later
Published
- 15 years later
· 15 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
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 8.9% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.0.
Affected products
n/a
- affected n/a
References
References12
- 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)
- EUVD EUVD-2009-3699 (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://cveledger.app/cve/CVE-2009-3727)Record last updated .