CVE-2009-1476: Buffer overflow in lib/load_http.c in ippool in Darren Reed IPFilter (aka IP Filter) 4.1.31 allows local users

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HIGH 7.2DOWNGRADE

CVE-2009-1476 is a high-severity flaw (CVSS 7.2) affecting ipfilter. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in lib/load_http.c in ippool in Darren Reed IPFilter (aka IP Filter) 4.1.31 allows local users to gain privileges via vectors involving a long hostname in a URL.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.2 (High)
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-119
Published	2009-05-26
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: darren reed

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

Am I affected?

Timeline

2009-05-26 15:30 UTCPublished CVE record published
2026-06-16 23:07 UTCUpdated Record last modified

darren reed ipfilter DOWNGRADE

Affected: 4.1.31

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.1.31

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.1.31 (Debian / Ubuntu)

apt-cache madison ipfilter sudo apt install ipfilter=<VERSION_BEFORE_4.1.31> sudo apt-mark hold ipfilter

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

dnf --showduplicates list ipfilter sudo dnf downgrade ipfilter-<VERSION_BEFORE_4.1.31> sudo dnf versionlock add ipfilter

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.

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-2009-1476?

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

Is CVE-2009-1476 being exploited?

CVE-2009-1476 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-2009-1476 affect?

CVE-2009-1476 affects ipfilter. Severity is high (CVSS 7.2). Buffer overflow in lib/load_http.c in ippool in Darren Reed IPFilter (aka IP Filter) 4.1.31 allows local users to gain privileges via vectors involving a long hostname in a URL.

How urgent is CVE-2009-1476?

Priority 40/100. High severity; Public exploit reference

References

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