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Vulnerability record · CVE-2006-0738 · published 17 February 2006

CVE-2006-0738: Estara softphone vulnerability

Estara · Softphone

Multiple format string vulnerabilities in eStara SIP softphone allow remote attackers to cause a denial of service (hang) via SIP INVITE requests with format string specifiers in the SDP session description, as demonstrated using (1) the field name, (2) the o field (owner/creator and session identifier), or (3) the m field (media name and transport address).

5.0 CVSS 2.0 Medium EPSS 3.1% · top 12.7%
5.0CVSS 2.0 base score
3.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
16 Jun 2026Last modified by NVD

Description

Multiple format string vulnerabilities in eStara SIP softphone allow remote attackers to cause a denial of service (hang) via SIP INVITE requests with format string specifiers in the SDP session description, as demonstrated using (1) the field name, (2) the o field (owner/creator and session identifier), or (3) the m field (media name and transport address).

AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://secunia.com/advisories/18872 Vendor Advisory
http://www.securityfocus.com/archive/1/424943/100/0/threaded
http://www.securityfocus.com/bid/16629
http://www.vupen.com/english/advisories/2006/0607
https://exchange.xforce.ibmcloud.com/vulnerabilities/24678
http://secunia.com/advisories/18872 Vendor Advisory
http://www.securityfocus.com/archive/1/424943/100/0/threaded
http://www.securityfocus.com/bid/16629
http://www.vupen.com/english/advisories/2006/0607
https://exchange.xforce.ibmcloud.com/vulnerabilities/24678

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2006-0189Estara softphone vulnerabilityBuffer overflow in eStara Softphone 3.0.1.14 through 3.0.1.46 allows remote attackers to execute arbitrary code via a long attribute (aka "a") field …EPSS 16%5.0CVE-2006-0737Estara softphone vulnerabilityeStara SIP softphone allows remote attackers to cause a denial of service (crash) via a SIP OPTIONS request with a negative Expires field.EPSS 3.1%5.0CVE-2006-0739Estara softphone vulnerabilityeStara SIP softphone allows remote attackers to cause a denial of service (crash) via an INVITE request with a Content-Length field that has more tha…EPSS 1.6%

Source: NIST National Vulnerability Database (record CVE-2006-0738), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.