CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
EPSS
Percentile
85.9%
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.