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Case File

CVE-2011-2536

MEDIUM · CVSS 5 EPSS 1.94%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2011-07-06 · Last synced 2026-08-04

Field Assessment

AI analysis pending.

CVE
CVE-2011-2536
Severity
MEDIUM
CVSS
5
EPSS
1.94%

Original Filing — NVD Description

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.