chan_sip.c in the SIP channel driver in Asterisk Open Source 1.4.x before 1.4.41.2, 1.6.2.x before 1.6.2.18.2, and 1.8.x before 1.8.4.4, and Asterisk Business Edition C.3.x before C.3.7.3, disregards the alwaysauthreject option and generates different responses for invalid SIP requests depending on whether the user account exists, which allows remote attackers to enumerate account names via a series of requests.
CVE-2011-2536 is a security vulnerability that . Impacting 1 product from digium organizations running these solutions should prioritize assessment and patching.
Documented in 2011, this vulnerability occurred amid the cloud computing expansion era, where traditional network perimeter security models were being reevaluated. Organizations were transitioning from isolated infrastructure to interconnected systems, creating new attack surfaces that vulnerabilities like this could exploit.
2011-07-06T19:55:03.543
2025-04-11T00:51:21.963
Deferred
CVSSv2: 5.0 (MEDIUM)
AV:N/AC:L/Au:N/C:P/I:N/A:N
10.0
2.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | digium | asterisk | 1.8.0 | Yes |
| Application | digium | asterisk | 1.8.0 | Yes |
| Application | digium | asterisk | 1.8.0 | Yes |
| Application | digium | asterisk | 1.8.0 | Yes |
| Application | digium | asterisk | 1.8.0 | Yes |
| Application | digium | asterisk | 1.8.0 | Yes |
| Application | digium | asterisk | 1.8.0 | Yes |
| Application | digium | asterisk | 1.8.0 | Yes |
| Application | digium | asterisk | 1.8.0 | Yes |
| Application | digium | asterisk | 1.8.0 | Yes |
| Application | digium | asterisk | 1.8.1 | Yes |
| Application | digium | asterisk | 1.8.1 | Yes |
| Application | digium | asterisk | 1.8.1.1 | Yes |
| Application | digium | asterisk | 1.8.1.2 | Yes |
| Application | digium | asterisk | 1.8.2 | Yes |
| Application | digium | asterisk | 1.8.2.1 | Yes |
| Application | digium | asterisk | 1.8.2.2 | Yes |
| Application | digium | asterisk | 1.8.2.3 | Yes |
| Application | digium | asterisk | 1.8.2.4 | Yes |
| Application | digium | asterisk | 1.8.3 | Yes |
| Application | digium | asterisk | 1.8.3 | Yes |
| Application | digium | asterisk | 1.8.3 | Yes |
| Application | digium | asterisk | 1.8.3 | Yes |
| Application | digium | asterisk | 1.8.3.1 | Yes |
| Application | digium | asterisk | 1.8.3.2 | Yes |
| Application | digium | asterisk | 1.8.3.3 | Yes |
| Application | digium | asterisk | 1.8.4 | Yes |
| Application | digium | asterisk | 1.8.4 | Yes |
| Application | digium | asterisk | 1.8.4 | Yes |
| Application | digium | asterisk | 1.8.4 | Yes |
| Application | digium | asterisk | 1.8.4.1 | Yes |
| Application | digium | asterisk | 1.8.4.2 | Yes |
| Application | digium | asterisk | 1.8.4.3 | Yes |
| Application | digium | asterisk | 1.6.2.0 | Yes |
| Application | digium | asterisk | 1.6.2.0 | Yes |
| Application | digium | asterisk | 1.6.2.0 | Yes |
| Application | digium | asterisk | 1.6.2.0 | Yes |
| Application | digium | asterisk | 1.6.2.0 | Yes |
| Application | digium | asterisk | 1.6.2.0 | Yes |
| Application | digium | asterisk | 1.6.2.0 | Yes |
| Application | digium | asterisk | 1.6.2.0 | Yes |
| Application | digium | asterisk | 1.6.2.1 | Yes |
| Application | digium | asterisk | 1.6.2.1 | Yes |
| Application | digium | asterisk | 1.6.2.2 | Yes |
| Application | digium | asterisk | 1.6.2.3 | Yes |
| Application | digium | asterisk | 1.6.2.4 | Yes |
| Application | digium | asterisk | 1.6.2.5 | Yes |
| Application | digium | asterisk | 1.6.2.6 | Yes |
| Application | digium | asterisk | 1.6.2.6 | Yes |
| Application | digium | asterisk | 1.6.2.6 | Yes |
| Application | digium | asterisk | 1.6.2.15 | Yes |
| Application | digium | asterisk | 1.6.2.16 | Yes |
| Application | digium | asterisk | 1.6.2.16 | Yes |
| Application | digium | asterisk | 1.6.2.16.1 | Yes |
| Application | digium | asterisk | 1.6.2.16.2 | Yes |
| Application | digium | asterisk | 1.6.2.17 | Yes |
| Application | digium | asterisk | 1.6.2.17 | Yes |
| Application | digium | asterisk | 1.6.2.17 | Yes |
| Application | digium | asterisk | 1.6.2.17 | Yes |
| Application | digium | asterisk | 1.6.2.17.1 | Yes |
| Application | digium | asterisk | 1.6.2.17.2 | Yes |
| Application | digium | asterisk | 1.6.2.17.3 | Yes |
| Application | digium | asterisk | 1.6.2.18 | Yes |
| Application | digium | asterisk | 1.6.2.18 | Yes |
| Application | digium | asterisk | 1.6.2.18.1 | Yes |
| Application | digium | asterisk | 1.4.0 | Yes |
| Application | digium | asterisk | 1.4.0 | Yes |
| Application | digium | asterisk | 1.4.0 | Yes |
| Application | digium | asterisk | 1.4.0 | Yes |
| Application | digium | asterisk | 1.4.0 | Yes |
| Application | digium | asterisk | 1.4.1 | Yes |
| Application | digium | asterisk | 1.4.2 | Yes |
| Application | digium | asterisk | 1.4.3 | Yes |
| Application | digium | asterisk | 1.4.4 | Yes |
| Application | digium | asterisk | 1.4.5 | Yes |
| Application | digium | asterisk | 1.4.6 | Yes |
| Application | digium | asterisk | 1.4.7 | Yes |
| Application | digium | asterisk | 1.4.7.1 | Yes |
| Application | digium | asterisk | 1.4.8 | Yes |
| Application | digium | asterisk | 1.4.9 | Yes |
| Application | digium | asterisk | 1.4.10 | Yes |
| Application | digium | asterisk | 1.4.10.1 | Yes |
| Application | digium | asterisk | 1.4.11 | Yes |
| Application | digium | asterisk | 1.4.12 | Yes |
| Application | digium | asterisk | 1.4.12.1 | Yes |
| Application | digium | asterisk | 1.4.13 | Yes |
| Application | digium | asterisk | 1.4.14 | Yes |
| Application | digium | asterisk | 1.4.15 | Yes |
| Application | digium | asterisk | 1.4.16 | Yes |
| Application | digium | asterisk | 1.4.16.1 | Yes |
| Application | digium | asterisk | 1.4.16.2 | Yes |
| Application | digium | asterisk | 1.4.17 | Yes |
| Application | digium | asterisk | 1.4.18 | Yes |
| Application | digium | asterisk | 1.4.19 | Yes |
| Application | digium | asterisk | 1.4.19 | Yes |
| Application | digium | asterisk | 1.4.19 | Yes |
| Application | digium | asterisk | 1.4.19 | Yes |
| Application | digium | asterisk | 1.4.19 | Yes |
| Application | digium | asterisk | 1.4.19.1 | Yes |
| Application | digium | asterisk | 1.4.19.2 | Yes |
| Application | digium | asterisk | 1.4.20 | Yes |
| Application | digium | asterisk | 1.4.20 | Yes |
| Application | digium | asterisk | 1.4.20 | Yes |
| Application | digium | asterisk | 1.4.20 | Yes |
| Application | digium | asterisk | 1.4.20.1 | Yes |
| Application | digium | asterisk | 1.4.21 | Yes |
| Application | digium | asterisk | 1.4.21 | Yes |
| Application | digium | asterisk | 1.4.21 | Yes |
| Application | digium | asterisk | 1.4.21.1 | Yes |
| Application | digium | asterisk | 1.4.21.2 | Yes |
| Application | digium | asterisk | 1.4.22 | Yes |
| Application | digium | asterisk | 1.4.22 | Yes |
| Application | digium | asterisk | 1.4.22 | Yes |
| Application | digium | asterisk | 1.4.22 | Yes |
| Application | digium | asterisk | 1.4.22 | Yes |
| Application | digium | asterisk | 1.4.22 | Yes |
| Application | digium | asterisk | 1.4.22.1 | Yes |
| Application | digium | asterisk | 1.4.22.2 | Yes |
| Application | digium | asterisk | 1.4.23 | Yes |
| Application | digium | asterisk | 1.4.23 | Yes |
| Application | digium | asterisk | 1.4.23 | Yes |
| Application | digium | asterisk | 1.4.23 | Yes |
| Application | digium | asterisk | 1.4.23 | Yes |
| Application | digium | asterisk | 1.4.23.1 | Yes |
| Application | digium | asterisk | 1.4.23.2 | Yes |
| Application | digium | asterisk | 1.4.24 | Yes |
| Application | digium | asterisk | 1.4.24 | Yes |
| Application | digium | asterisk | 1.4.24.1 | Yes |
| Application | digium | asterisk | 1.4.25 | Yes |
| Application | digium | asterisk | 1.4.25 | Yes |
| Application | digium | asterisk | 1.4.25.1 | Yes |
| Application | digium | asterisk | 1.4.26 | Yes |
| Application | digium | asterisk | 1.4.26 | Yes |
| Application | digium | asterisk | 1.4.26 | Yes |
| Application | digium | asterisk | 1.4.26 | Yes |
| Application | digium | asterisk | 1.4.26 | Yes |
| Application | digium | asterisk | 1.4.26 | Yes |
| Application | digium | asterisk | 1.4.26 | Yes |
| Application | digium | asterisk | 1.4.26.1 | Yes |
| Application | digium | asterisk | 1.4.26.2 | Yes |
| Application | digium | asterisk | 1.4.26.3 | Yes |
| Application | digium | asterisk | 1.4.27 | Yes |
| Application | digium | asterisk | 1.4.27 | Yes |
| Application | digium | asterisk | 1.4.27 | Yes |
| Application | digium | asterisk | 1.4.27 | Yes |
| Application | digium | asterisk | 1.4.27 | Yes |
| Application | digium | asterisk | 1.4.27 | Yes |
| Application | digium | asterisk | 1.4.27.1 | Yes |
| Application | digium | asterisk | 1.4.28 | Yes |
| Application | digium | asterisk | 1.4.28 | Yes |
| Application | digium | asterisk | 1.4.29 | Yes |
| Application | digium | asterisk | 1.4.29 | Yes |
| Application | digium | asterisk | 1.4.29.1 | Yes |
| Application | digium | asterisk | 1.4.30 | Yes |
| Application | digium | asterisk | 1.4.30 | Yes |
| Application | digium | asterisk | 1.4.30 | Yes |
| Application | digium | asterisk | 1.4.31 | Yes |
| Application | digium | asterisk | 1.4.31 | Yes |
| Application | digium | asterisk | 1.4.31 | Yes |
| Application | digium | asterisk | 1.4.32 | Yes |
| Application | digium | asterisk | 1.4.32 | Yes |
| Application | digium | asterisk | 1.4.33 | Yes |
| Application | digium | asterisk | 1.4.33 | Yes |
| Application | digium | asterisk | 1.4.33 | Yes |
| Application | digium | asterisk | 1.4.33.1 | Yes |
| Application | digium | asterisk | 1.4.34 | Yes |
| Application | digium | asterisk | 1.4.34 | Yes |
| Application | digium | asterisk | 1.4.34 | Yes |
| Application | digium | asterisk | 1.4.35 | Yes |
| Application | digium | asterisk | 1.4.35 | Yes |
| Application | digium | asterisk | 1.4.36 | Yes |
| Application | digium | asterisk | 1.4.36 | Yes |
| Application | digium | asterisk | 1.4.37 | Yes |
| Application | digium | asterisk | 1.4.37 | Yes |
| Application | digium | asterisk | 1.4.38 | Yes |
| Application | digium | asterisk | 1.4.38 | Yes |
| Application | digium | asterisk | 1.4.39 | Yes |
| Application | digium | asterisk | 1.4.39 | Yes |
| Application | digium | asterisk | 1.4.39.1 | Yes |
| Application | digium | asterisk | 1.4.39.2 | Yes |
| Application | digium | asterisk | 1.4.40 | Yes |
| Application | digium | asterisk | 1.4.40 | Yes |
| Application | digium | asterisk | 1.4.40 | Yes |
| Application | digium | asterisk | 1.4.40 | Yes |
| Application | digium | asterisk | 1.4.40.1 | Yes |
| Application | digium | asterisk | 1.4.40.2 | Yes |
| Application | digium | asterisk | 1.4.41 | Yes |
| Application | digium | asterisk | 1.4.41 | Yes |
| Application | digium | asterisk | 1.4.41.1 | Yes |
| Application | digium | asterisk | c.3.0 | Yes |
| Application | digium | asterisk | c.3.1.0 | Yes |
| Application | digium | asterisk | c.3.1.1 | Yes |
| Application | digium | asterisk | c.3.2.2 | Yes |
| Application | digium | asterisk | c.3.2.3 | Yes |
| Application | digium | asterisk | c.3.3.2 | Yes |
| Application | digium | asterisk | c.3.6.2 | Yes |
| Application | digium | asterisk | c.3.6.3 | Yes |
| Application | digium | asterisk | c.3.6.4 | Yes |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For digium's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.