CVE-2015-3400: sharenfs 0.6.4, when built with commits bcdd594 and 7d08880 from the zfs repository, provides world readable a

Routine

MEDIUM 4.3WATCHLISTDOWNGRADE

CVE-2015-3400 is a medium-severity flaw (CVSS 4.3) affecting zfs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

sharenfs 0.6.4, when built with commits bcdd594 and 7d08880 from the zfs repository, provides world readable access to the shared zfs file system, which might allow remote authenticated users to obtain sensitive information by reading shared files.

Why this priority

On your watchlist

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

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-200
Published	2017-10-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: zfsonlinux

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-10-18 15:29 UTCPublished CVE record published
2026-06-17 00:25 UTCUpdated Record last modified

zfsonlinux zfs DOWNGRADE

Affected: 0.6.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.6.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.6.4 (Debian / Ubuntu)

apt-cache madison zfs sudo apt install zfs=<VERSION_BEFORE_0.6.4> sudo apt-mark hold zfs

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

dnf --showduplicates list zfs sudo dnf downgrade zfs-<VERSION_BEFORE_0.6.4> sudo dnf versionlock add zfs

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-2015-3400?

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

Is CVE-2015-3400 being exploited?

CVE-2015-3400 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-2015-3400 affect?

CVE-2015-3400 affects zfs. Severity is medium (CVSS 4.3). sharenfs 0.6.4, when built with commits bcdd594 and 7d08880 from the zfs repository, provides world readable access to the shared zfs file system, which might allow remote authenticated users to obtain sensitive information by reading share

How urgent is CVE-2015-3400?

Priority 39/100. On your watchlist

References

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