Descriptionchan_sip in Asterisk Open Source 1.8.x, 11.x before 11.21.1, 12.x, and 13.x before 13.7.1 and Certified Asterisk 1.8.28, 11.6 before 11.6-cert12, and 13.1 before 13.1-cert3, when the timert1 sip.conf configuration is set to a value greater than 1245, allows remote attackers to cause a denial of service (file descriptor consumption) via vectors related to large retransmit timeout values.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severityhigh (attack range: remote)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
asterisk (PTS)wheezy1:
wheezy (security)1:
jessie (security)1:11.13.1~dfsg-2+deb8u5fixed
stretch (security), stretch1:13.14.1~dfsg-2+deb9u3fixed
buster, sid1:13.18.5~dfsg-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[wheezy] - asterisk <no-dsa> (Minor issue)
[squeeze] - asterisk <end-of-life> (Not supported in Squeeze LTS)
issue introduced in ~2008 with the SIP timer support implementation (, so squeeze also vulnerable
patch for jessie / 11:
all versions vulnerable, backport required for wheezy

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