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CVE Record

CVE-2011-2666: The default configuration of the SIP channel driver in Asterisk Open Source 1.4.x through 1.4.41.2 and 1.6....

The default configuration of the SIP channel driver in Asterisk Open Source 1.4.x through 1.4.41.2 and 1.6.2.x through 1.6.2.18.2 does not enable the alwaysauthreject option, which allows remote attackers to enumerate account names by making a series of invalid SIP requests and observing the differences in the responses for different usernames, a different vulnerability than CVE-2011-2536.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

CVE-2011-2666 lets outsiders infer valid SIP account names on some older Asterisk Open Source systems. By comparing responses to invalid login-style requests, an attacker may learn which usernames exist. This is not direct system takeover, but it can help focus password attacks or social engineering against VoIP infrastructure. Exposure is most likely in legacy Asterisk Open Source PBX or VoIP deployments using the affected branches with SIP reachable from untrusted networks and default-style authentication rejection behavior. Treat this as a legacy VoIP hardening issue. Prioritize internet-facing or business-critical PBX systems, especially if they remain on unsupported Asterisk versions. The main business risk is enabling more targeted account attacks, not immediate takeover based on the provided evidence. Mitigation focus: Review Asterisk advisory AST-2011-011 and apply its recommended configuration or update path.; Enable alwaysauthreject where appropriate for affected SIP channel configurations.; Upgrade unsupported Asterisk 1.4.x or 1.6.2.x systems to a supported release..

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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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