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    CVE-2007-4103

    The IAX2 channel driver (chan_iax2) in Asterisk Open 1.2.x before 1.2.23, 1.4.x before 1.4.9, and Asterisk Appliance Developer Kit before 0.6.0, when configured to allow unauthenticated calls, allows remote attackers to cause a denial of service (resource exhaustion) via a flood of calls that do not complete a 3-way handshake, which causes an ast_channel to be allocated but not released.

    Published:Jul 31, 2007
    Last Modified:Apr 23, 2026
    EPS:Jul 31, 2007
    EPSS Score:0.02623
    CVSS Score:7.5

    Affected Products

    Vendor
    Digium
    Product
    Asterisk
    Vendor
    Digium
    Product
    Asterisk Appliance Developer Kit

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-469 HTTP DoS

    Related CVEs

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    CVE-2023-37457 (CVSS 7.5) — Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk versions 18.20.0 and pri…
    CVE-2023-49294 (CVSS 4.9) — Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk prior to versions 18.20.…
    CVE-2021-46837 (CVSS 6.5) — res_pjsip_t38 in Sangoma Asterisk 16.x before 16.16.2, 17.x before 17.9.3, and 18.x before 18.2.2, and Certifi…
    CVE-2022-26498 (CVSS 7.5) — An issue was discovered in Asterisk through 19.x. When using STIR/SHAKEN, it is possible to download files tha…
    CVE-2022-26651 (CVSS 9.8) — An issue was discovered in Asterisk through 19.x and Certified Asterisk through 16.8-cert13. The func_odbc mod…
    CVE-2022-26499 (CVSS 9.1) — An SSRF issue was discovered in Asterisk through 19.x. When using STIR/SHAKEN, it's possible to send arbitrary…
    CVE-2021-32558 (CVSS 7.5) — An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and …
    CVE-2021-31878 (CVSS 6.5) — An issue was discovered in PJSIP in Asterisk before 16.19.1 and before 18.5.1. To exploit, a re-INVITE without…
    CVE-2021-26713 (CVSS 6.5) — A stack-based buffer overflow in res_rtp_asterisk.c in Sangoma Asterisk before 16.16.1, 17.x before 17.9.2, an…

    References

    http://bugs.gentoo.org/show_bug.cgi?id=185713
    http://ftp.digium.com/pub/asa/ASA-2007-018.pdf
    http://osvdb.org/38197
    http://secunia.com/advisories/26274
    http://secunia.com/advisories/29051
    http://security.gentoo.org/glsa/glsa-200802-11.xml
    http://securityreason.com/securityalert/2960
    http://www.securityfocus.com/archive/1/475069/100/0/threaded
    http://www.securityfocus.com/bid/24950
    http://www.securitytracker.com/id?1018472
    http://www.vupen.com/english/advisories/2007/2701
    http://bugs.gentoo.org/show_bug.cgi?id=185713
    http://ftp.digium.com/pub/asa/ASA-2007-018.pdf
    http://osvdb.org/38197
    http://secunia.com/advisories/26274
    http://secunia.com/advisories/29051
    http://security.gentoo.org/glsa/glsa-200802-11.xml
    http://securityreason.com/securityalert/2960
    http://www.securityfocus.com/archive/1/475069/100/0/threaded
    http://www.securityfocus.com/bid/24950
    http://www.securitytracker.com/id?1018472
    http://www.vupen.com/english/advisories/2007/2701

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High