CVE-2005-4466: Heap-based buffer overflow in the SIPParser function in i3sipmsg.dll in Interaction SIP Proxy before 3.0.011 a

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HIGH 7.5DOWNGRADE

CVE-2005-4466 is a high-severity flaw (CVSS 7.5) affecting interaction sip proxy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based buffer overflow in the SIPParser function in i3sipmsg.dll in Interaction SIP Proxy before 3.0.011 allows remote attackers to cause a denial of service and possibly execute arbitrary code via a REGISTER request with a SPI version number that contains a large number of space or tab characters.

Why this priority

High severity
EPSS top 4%: 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	12.9% (top 4%)
CISA exploited list	No
Published	2005-12-22
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: interactive intelligence

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

Am I affected?

Timeline

2005-12-22 00:03 UTCPublished CVE record published
2026-06-16 22:18 UTCUpdated Record last modified

interactive intelligence interaction sip proxy DOWNGRADE

Affected: 3.0.010

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.010

1. Check installed version

apt-cache policy interaction-sip-proxy || rpm -q interaction-sip-proxy || interaction-sip-proxy --version

2. No fixed release: DOWNGRADE to a release before 3.0.010 (Debian / Ubuntu)

apt-cache madison interaction-sip-proxy sudo apt install interaction-sip-proxy=<VERSION_BEFORE_3.0.010> sudo apt-mark hold interaction-sip-proxy

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

dnf --showduplicates list interaction-sip-proxy sudo dnf downgrade interaction-sip-proxy-<VERSION_BEFORE_3.0.010> sudo dnf versionlock add interaction-sip-proxy

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: Interaction SIP Proxy 3.0 - Remote Heap Corruption 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-2005-4466?

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

Is CVE-2005-4466 being exploited?

CVE-2005-4466 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-2005-4466 affect?

CVE-2005-4466 affects interaction sip proxy. Severity is high (CVSS 7.5). Heap-based buffer overflow in the SIPParser function in i3sipmsg.dll in Interaction SIP Proxy before 3.0.011 allows remote attackers to cause a denial of service and possibly execute arbitrary code via a REGISTER request with a SPI version

How urgent is CVE-2005-4466?

Priority 55/100. High severity; EPSS top 4%: very likely to be exploited; Public exploit reference

References

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