CVE-2009-3704

CVE-2009-3704 is a medium-severity vulnerability in Zoiper with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

ZoIPer 2.22, and possibly other versions before 2.24 Library 5324, allows remote attackers to cause a denial of service (crash) via a SIP INVITE request with an empty Call-Info header.

Frequently asked questions

What is CVE-2009-3704?
ZoIPer 2.22, and possibly other versions before 2.24 Library 5324, allows remote attackers to cause a denial of service (crash) via a SIP INVITE request with an empty Call-Info header.
How severe is CVE-2009-3704?
CVE-2009-3704 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-3704 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-3704?
CVE-2009-3704 primarily affects Zoiper. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-3704?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-3704 published?
CVE-2009-3704 was published on 2009-10-16 and last updated on 2026-06-16.

References

Affected products (4)