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.

Threat-Mapped Scoring

Score: 1.9

Priority: P3 - Important (Medium)

• S9 – Sabotage of System/App
• S10 – Denial of Service (+0.1 bonus)

EPSS

Score: 0.03165
Percentile: 0.86386

CVSS Scoring

Mapped CWE(s)

• CWE-772 : Missing Release of Resource after Effective Lifetime

All CAPEC(s)

CAPEC(s) with Mapped TTPs

Mapped ATT&CK TTPs

• T1499.002 : Service Exhaustion Flood
  Kill Chain: impact

Affected Products

• cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*
• cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*
• cpe:2.3:a:digium:asterisk_appliance_developer_kit:*:*:*:*:*:*:*:*

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