CVE-2006-4654: Format string vulnerability in Easy Address Book Web Server 1.2 allows remote attackers to cause a denial of s

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MEDIUM 5.1DOWNGRADE

CVE-2006-4654 is a medium-severity flaw (CVSS 5.1) affecting easy address book 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 Address Book Web Server 1.2 allows remote attackers to cause a denial of service (crash) or "compromise the server" via encoded format string specifiers in the query string.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.1 (Medium)
EPSS exploit chance	2.2% (top 18%)
CISA exploited list	No
Published	2006-09-09
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

2006-09-09 00:04 UTCPublished CVE record published
2026-06-16 22:29 UTCUpdated Record last modified

efs software easy address book web server DOWNGRADE

Affected: 1.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2

1. Check installed version

apt-cache policy easy-address-book-web-server || rpm -q easy-address-book-web-server || easy-address-book-web-server --version

2. No fixed release: DOWNGRADE to a release before 1.2 (Debian / Ubuntu)

apt-cache madison easy-address-book-web-server sudo apt install easy-address-book-web-server=<VERSION_BEFORE_1.2> sudo apt-mark hold easy-address-book-web-server

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

dnf --showduplicates list easy-address-book-web-server sudo dnf downgrade easy-address-book-web-server-<VERSION_BEFORE_1.2> sudo dnf versionlock add easy-address-book-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 Address Book Web Server 1.2 - Remote Format String

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-2006-4654?

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

Is CVE-2006-4654 being exploited?

CVE-2006-4654 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-2006-4654 affect?

CVE-2006-4654 affects easy address book web server. Severity is medium (CVSS 5.1). Format string vulnerability in Easy Address Book Web Server 1.2 allows remote attackers to cause a denial of service (crash) or "compromise the server" via encoded format string specifiers in the query string.

How urgent is CVE-2006-4654?

Priority 43/100. Public exploit reference

Related CVEs

CVE-2023-4493 MEDIUM 6.1 DOWNGRADE Stored Cross-Site Scripting in Easy Address Book Web Server 1.6 version, through the users_admin.ghp file that
CVE-2023-4492 MEDIUM 6.1 DOWNGRADE Vulnerability in Easy Address Book Web Server 1.6 version, affecting the parameters (firstname, homephone, las
CVE-2023-4491 CRITICAL 9.8 DOWNGRADE Buffer overflow vulnerability in Easy Address Book Web Server 1.6 version

References

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