CVE-2006-3524: Buffer overflow in SIPfoundry sipXtapi released before 20060324 allows remote attackers to execute arbitrary c

This week

HIGH 7.5MITIGATE

CVE-2006-3524 is a high-severity flaw (CVSS 7.5) affecting sipxtapi. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in SIPfoundry sipXtapi released before 20060324 allows remote attackers to execute arbitrary code via a long CSeq field value in an INVITE message.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	67.5% (top 1%)
CISA exploited list	No
Published	2006-07-12
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: sipfoundry

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-07-12 00:05 UTCPublished CVE record published
2026-06-16 22:27 UTCUpdated Record last modified

sipfoundry sipxtapi MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy sipxtapi || rpm -q sipxtapi || sipxtapi --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: SIPfoundry sipXtapi - 'CSeq' Remote Buffer Overflow (PoC)
Exploit-DB: AIM Triton 1.0.4 - CSeq Buffer Overflow (Metasploit)
Exploit-DB: SIPfoundry sipXezPhone 0.35a - CSeq Field Overflow (Metasploit)
Exploit-DB: SIPfoundry sipXphone 2.6.0.27 - CSeq Buffer Overflow (Metasploit)
Metasploit: AIM Triton 1.0.4 CSeq Buffer Overflow
Metasploit: SIPfoundry sipXezPhone 0.35a CSeq Field Overflow
Metasploit: SIPfoundry sipXphone 2.6.0.27 CSeq Buffer Overflow

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2006-3524?

sipxtapi: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-3524 being exploited?

CVE-2006-3524 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2006-3524 affect?

CVE-2006-3524 affects sipxtapi. Severity is high (CVSS 7.5). Buffer overflow in SIPfoundry sipXtapi released before 20060324 allows remote attackers to execute arbitrary code via a long CSeq field value in an INVITE message.

How urgent is CVE-2006-3524?

Priority 56/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference

References

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