How severe is CVE-2006-0739?

CVE-2006-0739 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2006-0739 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2006-0739?

CVE-2006-0739 affects Estara Softphone. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2006-0739?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2006-0739 published?

CVE-2006-0739 was published on 2006-02-17 and last updated on 2026-06-16.

CVE-2006-0739

CVE-2006-0739 is a medium-severity vulnerability in Estara Softphone 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

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Estara Softphone
Published: 2006-02-17
Last modified: 2026-06-16

Description

eStara SIP softphone allows remote attackers to cause a denial of service (crash) via an INVITE request with a Content-Length field that has more than 9 digits.

Frequently asked questions

What is CVE-2006-0739?: eStara SIP softphone allows remote attackers to cause a denial of service (crash) via an INVITE request with a Content-Length field that has more than 9 digits.
How severe is CVE-2006-0739?: CVE-2006-0739 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2006-0739 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-0739?: CVE-2006-0739 affects Estara Softphone. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2006-0739?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2006-0739 published?: CVE-2006-0739 was published on 2006-02-17 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:estara:softphone:*:*:*:*:*:*:*:*

More vulnerabilities in Estara Softphone

CVE-2006-0189 — High (CVSS 7.5): Buffer overflow in eStara Softphone 3.0.1.14 through 3.0.1.46 allows remote attackers to execute arbitrary code via a…
CVE-2006-0737 — Medium (CVSS 5.0): eStara SIP softphone allows remote attackers to cause a denial of service (crash) via a SIP OPTIONS request with a…
CVE-2006-0738 — Medium (CVSS 5.0): Multiple format string vulnerabilities in eStara SIP softphone allow remote attackers to cause a denial of service…

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