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CVE-2011-2666

5.0 · MEDIUM

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 at…

Published Jul 6, 2011digiumCWE-16EPSS 1.33%

Overview

CVE-2011-2666 is a medium-severity vulnerability affecting digium asterisk. It was published on July 6, 2011 and has a CVSS 2.0 base score of 5.0 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories and patches from digium. Update asterisk to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refdownloads.asterisk.org/pub/security/AST-2011-011.htmlRefexchange.xforce.ibmcloud.com/vulnerabilities/68472Refdownloads.asterisk.org/pub/security/AST-2011-011.htmlRefexchange.xforce.ibmcloud.com/vulnerabilities/68472

How CyberStrike helps

Frequently asked questions

What is CVE-2011-2666?

CVE-2011-2666 is a medium-severity vulnerability affecting digium asterisk. It was published on July 6, 2011 and has a CVSS 2.0 base score of 5.0 (MEDIUM).

How severe is CVE-2011-2666?

This vulnerability has a CVSS 2.0 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2011-2666?

Check the references section for vendor advisories and patches from digium. Update asterisk to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2011-2666?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2011-2666 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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