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CVE Record

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 befor...

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

This issue lets a remote party tell which SIP usernames exist on vulnerable Asterisk systems because valid and invalid names trigger different errors. It does not by itself grant access, but it can reduce guesswork for account targeting, password attacks, or social engineering against voice infrastructure. Exposure is most relevant where vulnerable Asterisk SIP registration services are reachable by untrusted networks. Internal-only PBX deployments have lower exposure, but still matter if guest, partner, or compromised hosts can reach SIP registration. Treat this as a targeted exposure reduction item for voice systems, not an emergency without other risk signals. Prioritize internet-facing or partner-facing SIP services and environments with weak SIP account passwords. Mitigation focus: Upgrade Asterisk Open Source to the fixed branch version or later.; Upgrade affected Business Edition branches to the listed fixed versions.; Upgrade s800i 1.3.x to 1.3.0.5 or later..

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Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors
0Timeline events
0ADP providers
5Source links

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Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

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