CVE-2007-3548: Stack-based buffer overflow in W3Filer 2.1.3 allows remote FTP servers to cause a denial of service (applicati

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HIGH 7.1DOWNGRADE

CVE-2007-3548 is a high-severity flaw (CVSS 7.1) affecting w3filer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based buffer overflow in W3Filer 2.1.3 allows remote FTP servers to cause a denial of service (application hang or crash) and possibly execute arbitrary code by sending a large banner to a client that is sending a file.

Why this priority

High severity
EPSS top 10%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	7.1 (High)
EPSS exploit chance	3.9% (top 10%)
CISA exploited list	No
Published	2007-07-03
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: w3filer

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

Am I affected?

Timeline

2007-07-03 21:30 UTCPublished CVE record published
2026-06-16 22:42 UTCUpdated Record last modified

w3filer w3filer DOWNGRADE

Affected: 2.1.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1.3

1. Check installed version

apt-cache policy w3filer || rpm -q w3filer || w3filer --version

2. No fixed release: DOWNGRADE to a release before 2.1.3 (Debian / Ubuntu)

apt-cache madison w3filer sudo apt install w3filer=<VERSION_BEFORE_2.1.3> sudo apt-mark hold w3filer

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

dnf --showduplicates list w3filer sudo dnf downgrade w3filer-<VERSION_BEFORE_2.1.3> sudo dnf versionlock add w3filer

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: W3Filer 2.1.3 - Remote Stack Overflow (PoC)

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-2007-3548?

w3filer: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2007-3548 being exploited?

CVE-2007-3548 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-2007-3548 affect?

CVE-2007-3548 affects w3filer. Severity is high (CVSS 7.1). Stack-based buffer overflow in W3Filer 2.1.3 allows remote FTP servers to cause a denial of service (application hang or crash) and possibly execute arbitrary code by sending a large banner to a client that is sending a file.

How urgent is CVE-2007-3548?

Priority 52/100. High severity; EPSS top 10%: very likely to be exploited; Public exploit reference

References

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