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Vulnerability record · CVE-2013-5642 · published 9 September 2013

CVE-2013-5642: Digium asterisk improper input validation vulnerability

Digium · Asterisk

The SIP channel driver (channels/chan_sip.c) in Asterisk Open Source 1.8.x before 1.8.23.1, 10.x before 10.12.3, and 11.x before 11.5.1; Certified Asterisk 1.8.15 before 1.8.15-cert3 and 11.2 before 11.2-cert2; and Asterisk Digiumphones 10.x-digiumphones before 10.12.3-digiumphones allows remote attackers to cause a denial of service (NULL pointer dereference, segmentation fault, and daemon crash) via an invalid SDP that defines a media description before the connection description in a SIP request.

5.0 CVSS 2.0 Medium EPSS 12% · top 4.1% CWE-20 · Improper input validation
5.0CVSS 2.0 base score
12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
20References
16 Jun 2026Last modified by NVD

Description

The SIP channel driver (channels/chan_sip.c) in Asterisk Open Source 1.8.x before 1.8.23.1, 10.x before 10.12.3, and 11.x before 11.5.1; Certified Asterisk 1.8.15 before 1.8.15-cert3 and 11.2 before 11.2-cert2; and Asterisk Digiumphones 10.x-digiumphones before 10.12.3-digiumphones allows remote attackers to cause a denial of service (NULL pointer dereference, segmentation fault, and daemon crash) via an invalid SDP that defines a media description before the connection description in a SIP request.

AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://archives.neohapsis.com/archives/bugtraq/2013-08/0174.html
http://downloads.asterisk.org/pub/security/AST-2013-005.html PatchVendor Advisory
http://osvdb.org/96690
http://secunia.com/advisories/54534 Vendor Advisory
http://secunia.com/advisories/54617
http://www.debian.org/security/2013/dsa-2749
http://www.mandriva.com/security/advisories?name=MDVSA-2013:223
http://www.securityfocus.com/bid/62022
http://www.securitytracker.com/id/1028957
https://issues.asterisk.org/jira/browse/ASTERISK-22007
http://archives.neohapsis.com/archives/bugtraq/2013-08/0174.html
http://downloads.asterisk.org/pub/security/AST-2013-005.html PatchVendor Advisory
http://osvdb.org/96690
http://secunia.com/advisories/54534 Vendor Advisory
http://secunia.com/advisories/54617
http://www.debian.org/security/2013/dsa-2749
http://www.mandriva.com/security/advisories?name=MDVSA-2013:223
http://www.securityfocus.com/bid/62022
http://www.securitytracker.com/id/1028957
https://issues.asterisk.org/jira/browse/ASTERISK-22007

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2013-5642), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.