CVE-2006-0189: Buffer overflow in eStara Softphone 3.0.1.14 through 3.0.1.46 allows remote attackers to execute arbitrary cod

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HIGH 7.5DOWNGRADE

CVE-2006-0189 is a high-severity flaw (CVSS 7.5) affecting softphone. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer 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 in the SDP data of a SIP packet on UDP port 5060.

Why this priority

High severity
EPSS top 3%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	15.9% (top 3%)
CISA exploited list	No
Published	2006-01-13
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

2006-01-13 11:03 UTCPublished CVE record published
2026-06-16 22:20 UTCUpdated Record last modified

estara softphone DOWNGRADE

Affected: 3.0.1.14 · 3.0.1.46

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.1.14

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.0.1.14 (Debian / Ubuntu)

apt-cache madison softphone sudo apt install softphone=<VERSION_BEFORE_3.0.1.14> sudo apt-mark hold softphone

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list softphone sudo dnf downgrade softphone-<VERSION_BEFORE_3.0.1.14> sudo dnf versionlock add softphone

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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 3.0.1.46 - SIP Remote Buffer Overflow (1)
Exploit-DB: eStara SoftPhone 3.0.1.46 - SIP Remote Buffer Overflow (2)

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-2006-0189?

softphone: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-0189 being exploited?

CVE-2006-0189 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-2006-0189 affect?

CVE-2006-0189 affects softphone. Severity is 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 long attribute (aka "a") field in the SDP data of a SIP packet on UDP port 5060.

How urgent is CVE-2006-0189?

Priority 55/100. High severity; EPSS top 3%: very likely to be exploited; Public exploit reference

Related CVEs

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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

References

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