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.

Published: 2009-11-10 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-3727 is rated Moderate Risk (54.9/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 4.20%). EPSS rose +3.48% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2009-3727

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.72% 4.20% +3.48%
2 2025-03-30 7.17% 0.72% -6.45%
3 2025-03-29 — 7.17% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-3727

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2009-3727

OS Trackers for CVE-2009-3727

vendor priority summary link
debian not yet assigned CVE-2009-3727 not yet assigned priority: Debian including 1 source packages (asterisk), 2 status rows across 2 suites (bullseye, sid): resolved 2. https://security-tracker.debian.org/tracker/CVE-2009-3727
gentoo normal CVE-2009-3727: 1 GLSA(s) (201006-20), 1 atom(s) (net-misc/asterisk); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2009-3727
redhat medium — https://access.redhat.com/security/cve/CVE-2009-3727
ubuntu low CVE-2009-3727 low priority: Ubuntu including 1 source packages (asterisk), 9 status rows across 9 suites (dapper, hardy, intrepid, jaunty, karmic, lucid, maverick, natty, upstream): ignored 4, not-affected 3, released 2. https://ubuntu.com/security/CVE-2009-3727

Affected software / configurations for CVE-2009-3727

Vendor Product Version Raw CPE
digium asterisk 1.2.0 cpe:2.3:a:digium:asterisk:1.2.0:*:*:*:*:*:*:*
digium asterisk 1.2.0 cpe:2.3:a:digium:asterisk:1.2.0:beta1:*:*:*:*:*:*
digium asterisk 1.2.0 cpe:2.3:a:digium:asterisk:1.2.0:beta2:*:*:*:*:*:*
digium asterisk 1.2.0 cpe:2.3:a:digium:asterisk:1.2.0:rc1:*:*:*:*:*:*
digium asterisk 1.2.0 cpe:2.3:a:digium:asterisk:1.2.0:rc2:*:*:*:*:*:*
digium asterisk 1.2.1 cpe:2.3:a:digium:asterisk:1.2.1:*:*:*:*:*:*:*
digium asterisk 1.2.2 cpe:2.3:a:digium:asterisk:1.2.2:*:*:*:*:*:*:*
digium asterisk 1.2.2 cpe:2.3:a:digium:asterisk:1.2.2:netsec:*:*:*:*:*:*
digium asterisk 1.2.3 cpe:2.3:a:digium:asterisk:1.2.3:*:*:*:*:*:*:*
digium asterisk 1.2.3 cpe:2.3:a:digium:asterisk:1.2.3:netsec:*:*:*:*:*:*
digium asterisk 1.2.10 cpe:2.3:a:digium:asterisk:1.2.10:*:*:*:*:*:*:*
digium asterisk 1.2.10 cpe:2.3:a:digium:asterisk:1.2.10:netsec:*:*:*:*:*:*
digium asterisk 1.2.11 cpe:2.3:a:digium:asterisk:1.2.11:*:*:*:*:*:*:*
digium asterisk 1.2.11 cpe:2.3:a:digium:asterisk:1.2.11:netsec:*:*:*:*:*:*
digium asterisk 1.2.12 cpe:2.3:a:digium:asterisk:1.2.12:*:*:*:*:*:*:*
digium asterisk 1.2.12 cpe:2.3:a:digium:asterisk:1.2.12:netsec:*:*:*:*:*:*
digium asterisk 1.2.12.1 cpe:2.3:a:digium:asterisk:1.2.12.1:*:*:*:*:*:*:*
digium asterisk 1.2.12.1 cpe:2.3:a:digium:asterisk:1.2.12.1:netsec:*:*:*:*:*:*
digium asterisk 1.2.13 cpe:2.3:a:digium:asterisk:1.2.13:*:*:*:*:*:*:*
digium asterisk 1.2.13 cpe:2.3:a:digium:asterisk:1.2.13:netsec:*:*:*:*:*:*
digium asterisk 1.2.14 cpe:2.3:a:digium:asterisk:1.2.14:*:*:*:*:*:*:*
digium asterisk 1.2.15 cpe:2.3:a:digium:asterisk:1.2.15:*:*:*:*:*:*:*
digium asterisk 1.2.15 cpe:2.3:a:digium:asterisk:1.2.15:netsec:*:*:*:*:*:*
digium asterisk 1.2.16 cpe:2.3:a:digium:asterisk:1.2.16:*:*:*:*:*:*:*
digium asterisk 1.2.16 cpe:2.3:a:digium:asterisk:1.2.16:netsec:*:*:*:*:*:*
digium asterisk 1.2.17 cpe:2.3:a:digium:asterisk:1.2.17:*:*:*:*:*:*:*
digium asterisk 1.2.17 cpe:2.3:a:digium:asterisk:1.2.17:netsec:*:*:*:*:*:*
digium asterisk 1.2.18 cpe:2.3:a:digium:asterisk:1.2.18:*:*:*:*:*:*:*
digium asterisk 1.2.18 cpe:2.3:a:digium:asterisk:1.2.18:netsec:*:*:*:*:*:*
digium asterisk 1.2.19 cpe:2.3:a:digium:asterisk:1.2.19:*:*:*:*:*:*:*
digium asterisk 1.2.19 cpe:2.3:a:digium:asterisk:1.2.19:netsec:*:*:*:*:*:*
digium asterisk 1.2.20 cpe:2.3:a:digium:asterisk:1.2.20:*:*:*:*:*:*:*
digium asterisk 1.2.20 cpe:2.3:a:digium:asterisk:1.2.20:netsec:*:*:*:*:*:*
digium asterisk 1.2.21 cpe:2.3:a:digium:asterisk:1.2.21:*:*:*:*:*:*:*
digium asterisk 1.2.21 cpe:2.3:a:digium:asterisk:1.2.21:netsec:*:*:*:*:*:*
digium asterisk 1.2.21.1 cpe:2.3:a:digium:asterisk:1.2.21.1:*:*:*:*:*:*:*
digium asterisk 1.2.21.1 cpe:2.3:a:digium:asterisk:1.2.21.1:netsec:*:*:*:*:*:*
digium asterisk 1.2.22 cpe:2.3:a:digium:asterisk:1.2.22:*:*:*:*:*:*:*
digium asterisk 1.2.22 cpe:2.3:a:digium:asterisk:1.2.22:netsec:*:*:*:*:*:*
digium asterisk 1.2.23 cpe:2.3:a:digium:asterisk:1.2.23:*:*:*:*:*:*:*
digium asterisk 1.2.23 cpe:2.3:a:digium:asterisk:1.2.23:netsec:*:*:*:*:*:*
digium asterisk 1.2.24 cpe:2.3:a:digium:asterisk:1.2.24:*:*:*:*:*:*:*
digium asterisk 1.2.24 cpe:2.3:a:digium:asterisk:1.2.24:netsec:*:*:*:*:*:*
digium asterisk 1.2.25 cpe:2.3:a:digium:asterisk:1.2.25:*:*:*:*:*:*:*
digium asterisk 1.2.25 cpe:2.3:a:digium:asterisk:1.2.25:netsec:*:*:*:*:*:*
digium asterisk 1.2.26 cpe:2.3:a:digium:asterisk:1.2.26:*:*:*:*:*:*:*
digium asterisk 1.2.26 cpe:2.3:a:digium:asterisk:1.2.26:netsec:*:*:*:*:*:*
digium asterisk 1.2.26.1 cpe:2.3:a:digium:asterisk:1.2.26.1:*:*:*:*:*:*:*
digium asterisk 1.2.26.1 cpe:2.3:a:digium:asterisk:1.2.26.1:netsec:*:*:*:*:*:*
digium asterisk 1.2.26.2 cpe:2.3:a:digium:asterisk:1.2.26.2:*:*:*:*:*:*:*
digium asterisk 1.2.26.2 cpe:2.3:a:digium:asterisk:1.2.26.2:netsec:*:*:*:*:*:*
digium asterisk 1.2.27 cpe:2.3:a:digium:asterisk:1.2.27:*:*:*:*:*:*:*
digium asterisk 1.2.28 cpe:2.3:a:digium:asterisk:1.2.28:*:*:*:*:*:*:*
digium asterisk 1.2.28.1 cpe:2.3:a:digium:asterisk:1.2.28.1:*:*:*:*:*:*:*
digium asterisk 1.2.29 cpe:2.3:a:digium:asterisk:1.2.29:*:*:*:*:*:*:*
digium asterisk 1.2.30 cpe:2.3:a:digium:asterisk:1.2.30:*:*:*:*:*:*:*
digium asterisk 1.2.30.1 cpe:2.3:a:digium:asterisk:1.2.30.1:*:*:*:*:*:*:*
digium asterisk 1.2.30.2 cpe:2.3:a:digium:asterisk:1.2.30.2:*:*:*:*:*:*:*
digium asterisk 1.2.30.3 cpe:2.3:a:digium:asterisk:1.2.30.3:*:*:*:*:*:*:*
digium asterisk 1.2.30.4 cpe:2.3:a:digium:asterisk:1.2.30.4:*:*:*:*:*:*:*
digium asterisk 1.2.31 cpe:2.3:a:digium:asterisk:1.2.31:*:*:*:*:*:*:*
digium asterisk 1.2.31.1 cpe:2.3:a:digium:asterisk:1.2.31.1:*:*:*:*:*:*:*
digium asterisk 1.2.32 cpe:2.3:a:digium:asterisk:1.2.32:*:*:*:*:*:*:*
digium asterisk 1.2.33 cpe:2.3:a:digium:asterisk:1.2.33:*:*:*:*:*:*:*
digium asterisk 1.2.34 cpe:2.3:a:digium:asterisk:1.2.34:*:*:*:*:*:*:*
digium asterisk 1.4.0 cpe:2.3:a:digium:asterisk:1.4.0:*:*:*:*:*:*:*
digium asterisk 1.4.0 cpe:2.3:a:digium:asterisk:1.4.0:beta1:*:*:*:*:*:*
digium asterisk 1.4.0 cpe:2.3:a:digium:asterisk:1.4.0:beta2:*:*:*:*:*:*
digium asterisk 1.4.0 cpe:2.3:a:digium:asterisk:1.4.0:beta3:*:*:*:*:*:*
digium asterisk 1.4.0 cpe:2.3:a:digium:asterisk:1.4.0:beta4:*:*:*:*:*:*
digium asterisk 1.4.1 cpe:2.3:a:digium:asterisk:1.4.1:*:*:*:*:*:*:*
digium asterisk 1.4.2 cpe:2.3:a:digium:asterisk:1.4.2:*:*:*:*:*:*:*
digium asterisk 1.4.3 cpe:2.3:a:digium:asterisk:1.4.3:*:*:*:*:*:*:*
digium asterisk 1.4.4 cpe:2.3:a:digium:asterisk:1.4.4:*:*:*:*:*:*:*
digium asterisk 1.4.5 cpe:2.3:a:digium:asterisk:1.4.5:*:*:*:*:*:*:*
digium asterisk 1.4.6 cpe:2.3:a:digium:asterisk:1.4.6:*:*:*:*:*:*:*
digium asterisk 1.4.7 cpe:2.3:a:digium:asterisk:1.4.7:*:*:*:*:*:*:*
digium asterisk 1.4.7.1 cpe:2.3:a:digium:asterisk:1.4.7.1:*:*:*:*:*:*:*
digium asterisk 1.4.8 cpe:2.3:a:digium:asterisk:1.4.8:*:*:*:*:*:*:*
digium asterisk 1.4.9 cpe:2.3:a:digium:asterisk:1.4.9:*:*:*:*:*:*:*

References for CVE-2009-3727

cvelogic Threat Intelligence