Is CVE-2007-4103 in the CISA KEV catalog?

No. CVE-2007-4103 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2007-4103?

CVE-2007-4103 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2007-4103?

CVE-2007-4103 has an EPSS score of 5.94% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2007-4103?

Upgrade asterisk on debian 11 to 1:1.4.9~dfsg-1 or later.

CVE & CISA-KEV Catalog

CVE-2007-4103

HIGHEPSS 92th pctl

7.5

CVSS v3

NVD

Description

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.

CWE-772

How to fix

Remediation Available

asteriskDebian

Fixed in:1:1.4.9~dfsg-1CVE-2007-4103

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

5.94%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Patch3

Third-Party Advisory4

Other references4

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.