CVE-2006-0738: Multiple format string vulnerabilities in eStara SIP softphone allow remote attackers to cause a denial of ser

Q: How do I fix CVE-2006-0738?

softphone: upgrade to newer than 3.0.1.47. Exact commands for each OS are on this page.

Q: Is CVE-2006-0738 being exploited?

CVE-2006-0738 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2006-0738 affect?

CVE-2006-0738 affects softphone. Severity is medium (CVSS 5.0). 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 fi

Q: How urgent is CVE-2006-0738?

Priority 44/100. Public exploit reference

This month

MEDIUM 5.0UPGRADE

CVE-2006-0738 is a medium-severity flaw (CVSS 5.0) affecting softphone. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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).

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	3.1% (top 12%)
CISA exploited list	No
Published	2006-02-17
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: estara

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

Am I affected?

Timeline

2006-02-17 01:02 UTCPublished CVE record published
2026-06-16 22:21 UTCUpdated Record last modified

estara softphone UPGRADE

Affected: <= 3.0.1.47

Fixed in: newer than 3.0.1.47

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 3.0.1.47 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade softphone

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade softphone

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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: eStara SoftPhone 3.0.1 - SIP SDP Message Handling Format String Denial of Service

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-2006-0738?

softphone: upgrade to newer than 3.0.1.47. Exact commands for each OS are on this page.

Is CVE-2006-0738 being exploited?

CVE-2006-0738 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-2006-0738 affect?

CVE-2006-0738 affects softphone. Severity is medium (CVSS 5.0). 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 fi

How urgent is CVE-2006-0738?

Priority 44/100. Public exploit reference

Related CVEs

CVE-2006-0739 MEDIUM 5.0 UPGRADE eStara SIP softphone allows remote attackers to cause a denial of service (crash) via an INVITE request with a
CVE-2006-0737 MEDIUM 5.0 UPGRADE eStara SIP softphone allows remote attackers to cause a denial of service (crash) via a SIP OPTIONS request wi
CVE-2006-0189 HIGH 7.5 DOWNGRADE Buffer overflow in eStara Softphone 3.0.1.14 through 3.0.1.46 allows remote attackers to execute arbitrary cod

References

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