CVE-2006-6684: Heap-based buffer overflow in Pedro Lineu Orso chetcpasswd before 2.4 allows remote attackers to cause a denia

Q: How do I fix CVE-2006-6684?

chetcpasswd: upgrade to newer than 2.3.3. Exact commands for each OS are on this page.

Q: Is CVE-2006-6684 being exploited?

CVE-2006-6684 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2006-6684 affect?

CVE-2006-6684 affects chetcpasswd. Severity is high (CVSS 7.5). Heap-based buffer overflow in Pedro Lineu Orso chetcpasswd before 2.4 allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via a long X-Forwarded-For HTTP header. NOTE: The provenance

This month

HIGH 7.5UPGRADE

CVE-2006-6684 is a high-severity flaw (CVSS 7.5) affecting chetcpasswd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based buffer overflow in Pedro Lineu Orso chetcpasswd before 2.4 allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via a long X-Forwarded-For HTTP header. NOTE: The provenance of this information is unknown; the details are obtained solely from third party information.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	3.0% (top 13%)
CISA exploited list	No
Weakness	CWE-119
Published	2006-12-21
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: pedro lineu orso

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

Am I affected?

Timeline

2006-12-21 19:28 UTCPublished CVE record published
2026-06-16 22:33 UTCUpdated Record last modified

pedro lineu orso chetcpasswd UPGRADE

Affected: <= 2.3.3 · 2.3.1

Fixed in: newer than 2.3.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.3.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade chetcpasswd

Note

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

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-2006-6684?

chetcpasswd: upgrade to newer than 2.3.3. Exact commands for each OS are on this page.

Is CVE-2006-6684 being exploited?

CVE-2006-6684 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-2006-6684 affect?

CVE-2006-6684 affects chetcpasswd. Severity is high (CVSS 7.5). Heap-based buffer overflow in Pedro Lineu Orso chetcpasswd before 2.4 allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via a long X-Forwarded-For HTTP header. NOTE: The provenance

How urgent is CVE-2006-6684?

Priority 48/100. High severity

Related CVEs

CVE-2006-6685 HIGH 7.2 DOWNGRADE Heap-based buffer overflow in Pedro Lineu Orso chetcpasswd 2.3.3 allows local users to cause a denial of servi
CVE-2006-6683 HIGH 7.8 UPGRADE Pedro Lineu Orso chetcpasswd 2.4.1 and earlier verifies and updates user accounts via custom code that process
CVE-2006-6682 MEDIUM 5.0 DOWNGRADE Pedro Lineu Orso chetcpasswd 2.3.3 provides a different error message when a request with a valid username fai
CVE-2006-6681 HIGH 7.5 DOWNGRADE Pedro Lineu Orso chetcpasswd 2.3.3 does not have a rate limit for client requests, which might allow remote at
CVE-2006-6680 MEDIUM 4.6 DOWNGRADE Pedro Lineu Orso chetcpasswd before 2.3.1 does not document the need for 0400 permissions on /etc/chetcpasswd.

References

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