CVE-2006-0739: eStara SIP softphone allows remote attackers to cause a denial of service (crash) via an INVITE request with a

Q: How do I fix CVE-2006-0739?

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

Q: Is CVE-2006-0739 being exploited?

CVE-2006-0739 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-2006-0739 affect?

CVE-2006-0739 affects softphone. Severity is medium (CVSS 5.0). 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.

Q: How urgent is CVE-2006-0739?

Priority 37/100. No elevated risk signals yet.

Routine

MEDIUM 5.0UPGRADE

CVE-2006-0739 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.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.6% (top 24%)
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.

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-2006-0739?

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

Is CVE-2006-0739 being exploited?

CVE-2006-0739 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-2006-0739 affect?

CVE-2006-0739 affects softphone. Severity is medium (CVSS 5.0). 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 urgent is CVE-2006-0739?

Priority 37/100. No elevated risk signals yet.

Related CVEs

CVE-2006-0738 MEDIUM 5.0 UPGRADE Multiple format string vulnerabilities in eStara SIP softphone allow remote attackers to cause a denial of ser
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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