CVE-2006-3123: Multiple integer overflows in the (1) dodecrypt and (2) doencrypt functions in cfs_fh.c in cfsd in Matt Blaze

Routine

LOW 2.1WATCHLISTDOWNGRADE

CVE-2006-3123 is a low-severity flaw (CVSS 2.1) affecting cryptographic file system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple integer overflows in the (1) dodecrypt and (2) doencrypt functions in cfs_fh.c in cfsd in Matt Blaze Cryptographic File System (CFS) 1.4.1 before Debian GNU/Linux package 1.4.1-17 allow local users to cause a denial of service (daemon crash) by appending data to a file that is larger than 2 Gb.

Why this priority

On your watchlist

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

Risk facts

CVSS score	2.1 (Low)
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Published	2006-08-07
Last modified	2026-06-16

Publisher (CNA): Debian GNU/Linux · Vendor: matt blaze

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

Am I affected?

Timeline

2006-08-07 19:04 UTCPublished CVE record published
2026-06-16 22:26 UTCUpdated Record last modified

matt blaze cryptographic file system DOWNGRADE

Affected: 1.4.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4.1

1. Check installed version

apt-cache policy cryptographic-file-system || rpm -q cryptographic-file-system || cryptographic-file-system --version

2. No fixed release: DOWNGRADE to a release before 1.4.1 (Debian / Ubuntu)

apt-cache madison cryptographic-file-system sudo apt install cryptographic-file-system=<VERSION_BEFORE_1.4.1> sudo apt-mark hold cryptographic-file-system

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

dnf --showduplicates list cryptographic-file-system sudo dnf downgrade cryptographic-file-system-<VERSION_BEFORE_1.4.1> sudo dnf versionlock add cryptographic-file-system

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-2006-3123?

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

Is CVE-2006-3123 being exploited?

CVE-2006-3123 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-2006-3123 affect?

CVE-2006-3123 affects cryptographic file system. Severity is low (CVSS 2.1). Multiple integer overflows in the (1) dodecrypt and (2) doencrypt functions in cfs_fh.c in cfsd in Matt Blaze Cryptographic File System (CFS) 1.4.1 before Debian GNU/Linux package 1.4.1-17 allow local users to cause a denial of service (dae

How urgent is CVE-2006-3123?

Priority 20/100. On your watchlist

Software pages

Debian vulnerabilities

References

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