CVE-2006-1159: Format string vulnerability in Easy File Sharing (EFS) Web Server 3.2 allows remote attackers to cause a denia

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HIGH 7.8DOWNGRADE

CVE-2006-1159 is a high-severity flaw (CVSS 7.8) affecting efs web server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Format string vulnerability in Easy File Sharing (EFS) Web Server 3.2 allows remote attackers to cause a denial of service (server crash) and possibly execute arbitrary code via format string specifiers in the query string argument in an HTTP GET request.

Why this priority

High severity
EPSS top 6%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
EPSS exploit chance	6.8% (top 6%)
CISA exploited list	No
Published	2006-03-12
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: efs software

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

Am I affected?

Timeline

2006-03-12 21:02 UTCPublished CVE record published
2026-06-16 22:22 UTCUpdated Record last modified

efs software efs web server DOWNGRADE

Affected: 3.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2

1. Check installed version

apt-cache policy efs-web-server || rpm -q efs-web-server || efs-web-server --version

2. No fixed release: DOWNGRADE to a release before 3.2 (Debian / Ubuntu)

apt-cache madison efs-web-server sudo apt install efs-web-server=<VERSION_BEFORE_3.2> sudo apt-mark hold efs-web-server

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

dnf --showduplicates list efs-web-server sudo dnf downgrade efs-web-server-<VERSION_BEFORE_3.2> sudo dnf versionlock add efs-web-server

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: Easy File Sharing Web Server 3.2 - Format String 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-2006-1159?

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

Is CVE-2006-1159 being exploited?

CVE-2006-1159 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-2006-1159 affect?

CVE-2006-1159 affects efs web server. Severity is high (CVSS 7.8). Format string vulnerability in Easy File Sharing (EFS) Web Server 3.2 allows remote attackers to cause a denial of service (server crash) and possibly execute arbitrary code via format string specifiers in the query string argument in an HT

How urgent is CVE-2006-1159?

Priority 56/100. High severity; EPSS top 6%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2006-5714 MEDIUM 5.0 DOWNGRADE Easy File Sharing (EFS) Web Server 4.0, when running on an NTFS file system, allows remote attackers to read a
CVE-2006-5713 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in Easy File Sharing (EFS) Web Server 4.0 allows remote attackers to
CVE-2006-1161 MEDIUM 6.5 DOWNGRADE Absolute path traversal vulnerability in Easy File Sharing (EFS) Web Server 3.2 allows remote registered users
CVE-2006-1160 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in Easy File Sharing (EFS) Web Server 3.2 allows remote attackers to
CVE-2004-1744 MEDIUM 5.0 DOWNGRADE Easy File Sharing (EFS) Webserver 1.25 allows remote attackers to cause a denial of service (CPU consumption o

References

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