Unscored severity · published Jul 6, 2011
CVE-2011-2536
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…
–
CVSS
1.9%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)1.9% · higher than 80% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
Asterisk · Digium
1.8.0; 1.8.0; 1.8.0; 1.8.0; 1.8.0; 1.8.0; +34 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2011-2536
CVE.org
https://www.cve.org/CVERecord?id=CVE-2011-2536
Patch
http://downloads.asterisk.org/pub/security/AST-2011-011-1.8.diff
Vendor Advisory
http://downloads.asterisk.org/pub/security/AST-2011-011.html
www.securitytracker.com
http://www.securitytracker.com/id?1025734
More from Asterisk
9.8
CVE-2022-26651
An issue was discovered in Asterisk through 19.x and Certified Asterisk through 16.8-cert13
9.8
CVE-2017-14100
In Asterisk 11.x before 11.25.2, 13.x before 13.17.1, and 14.x before 14.6.1 and Certified Asterisk 11.x before 11.6-cert17 and 13.x before 13.13-cert5, unauthorized command…
9.1
CVE-2022-26499
An SSRF issue was discovered in Asterisk through 19.x
8.8
CVE-2019-18610
An issue was discovered in manager.c in Sangoma Asterisk through 13.x, 16.x, 17.x and Certified Asterisk 13.21 through 13.21-cert4
8.8
CVE-2017-16671
A Buffer Overflow issue was discovered in Asterisk Open Source 13 before 13.18.1, 14 before 14.7.1, and 15 before 15.1.1 and Certified Asterisk 13.13 before 13.13-cert7