CVE-2006-5276: Stack-based buffer overflow in the DCE/RPC preprocessor in Snort before 2.6.1.3, and 2.7 before beta 2; and So

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HIGH 10.0UPGRADEDOWNGRADE

CVE-2006-5276 is a high-severity flaw (CVSS 10.0) affecting snort, intrusion sensor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based buffer overflow in the DCE/RPC preprocessor in Snort before 2.6.1.3, and 2.7 before beta 2; and Sourcefire Intrusion Sensor; allows remote attackers to execute arbitrary code via crafted SMB traffic.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	79.4% (top 1%)
CISA exploited list	No
Published	2007-02-20
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: snort · sourcefire

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

Am I affected?

Timeline

2007-02-20 01:28 UTCPublished CVE record published
2026-06-16 22:30 UTCUpdated Record last modified

snort snort UPGRADE

Affected: <= 2.6.1.2 · 2.6.1 · 2.6.1.1 · 2.7_beta1

Fixed in: newer than 2.6.1.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.6.1.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade snort

Note

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

sourcefire intrusion sensor DOWNGRADE

Affected: 4.1 · 4.5 · 4.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.1

1. Check installed version

apt-cache policy intrusion-sensor || rpm -q intrusion-sensor || intrusion-sensor --version

2. No fixed release: DOWNGRADE to a release before 4.1 (Debian / Ubuntu)

apt-cache madison intrusion-sensor sudo apt install intrusion-sensor=<VERSION_BEFORE_4.1> sudo apt-mark hold intrusion-sensor

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

dnf --showduplicates list intrusion-sensor sudo dnf downgrade intrusion-sensor-<VERSION_BEFORE_4.1> sudo dnf versionlock add intrusion-sensor

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: Snort 2.6.1 (Linux) - DCE/RPC Preprocessor Remote Buffer Overflow
Exploit-DB: Snort 2.6.1 - DCE/RPC Preprocessor Remote Buffer Overflow (Denial of Service) (PoC)
Exploit-DB: Snort 2 - DCE/RPC Preprocessor Buffer Overflow (Metasploit)
Exploit-DB: Snort 2.6.1 - DCE/RPC Preprocessor Remote Buffer Overflow
Metasploit: Snort 2 DCE/RPC Preprocessor Buffer Overflow

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-2006-5276?

snort: upgrade to newer than 2.6.1.2; intrusion sensor: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-5276 being exploited?

CVE-2006-5276 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-2006-5276 affect?

CVE-2006-5276 affects snort, intrusion sensor. Severity is high (CVSS 10.0). Stack-based buffer overflow in the DCE/RPC preprocessor in Snort before 2.6.1.3, and 2.7 before beta 2; and Sourcefire Intrusion Sensor; allows remote attackers to execute arbitrary code via crafted SMB traffic.

How urgent is CVE-2006-5276?

Priority 65/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference

Software pages

Suricata and Snort vulnerabilities

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References

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