Description
Asterisk Open Source 1.4.x before 1.4.40.1, 1.6.1.x before 1.6.1.25, 1.6.2.x before 1.6.2.17.3, and 1.8.x before 1.8.3.3 and Asterisk Business Edition C.x.x before C.3.6.4 do not restrict the number of unauthenticated sessions to certain interfaces, which allows remote attackers to cause a denial of service (file descriptor exhaustion and disk space exhaustion) via a series of TCP connections.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | asterisk | 1:1.8.3.3-1 | — |
| Debian 6.0 | asterisk | 1:1.6.2.9-2+squeeze2 | DSA-2225-1 |
| Debian 5.0 | asterisk | 1:1.4.21.2~dfsg-3+lenny2.1 | DSA-2225-1 |
Advisories 1
- DSA-2225-1 asterisk - several Debian Security (DSA / DLA) · Mar 9, 2026
References
- ADV-2011-1188 vdb-entry
- FEDORA-2011-5835 vendor-advisory
- DSA-2225 vendor-advisory
- 1025432 vdb-entry
- ADV-2011-1086 vdb-entry
- ADV-2011-1107 vdb-entry
- 44529 third-party-advisory
- FEDORA-2011-6208 vendor-advisory
- http://downloads.digium.com/pub/security/AST-2011-005.html
- https://bugzilla.redhat.com/show_bug.cgi?id=698916
- 44197 third-party-advisory