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CVE-2019-14907: All samba versions 4.9.x before 4.9.18, 4.10.x before 4.10.12 and 4.11.x before 4.11.5 have an issue where if

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MEDIUM 6.5WATCHLISTUPGRADEMITIGATEDOWNGRADE

CVE-2019-14907 is a medium-severity flaw (CVSS 6.5) affecting samba, fedora, storage. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

All samba versions 4.9.x before 4.9.18, 4.10.x before 4.10.12 and 4.11.x before 4.11.5 have an issue where if it is set with "log level = 3" (or above) then the string obtained from the client, after a failed character conversion, is printed. Such strings can be provided during the NTLMSSP authentication exchange. In the Samba AD DC in particular, this may cause a long-lived process(such as the RPC server) to terminate. (In the file server case,

Why this priority

  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score6.5 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionRequired
EPSS exploit chance3.2% (top 12%)
CISA exploited listNo
WeaknessCWE-125
Published2020-01-21
Last modified2026-06-17
Publisher (CNA): Red Hat, Inc. · Vendor: canonical · fedoraproject · redhat · samba · synology

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

Am I affected?

Timeline

samba samba UPGRADE
Affected: >= 4.9.0 and < 4.9.18 · >= 4.10.0 and < 4.10.12 · >= 4.11.0 and < 4.11.5
Fixed in: 4.9.18, 4.10.12, 4.11.5
Safe to downgrade to: a release before 4.9.0
1. Check installed version
apt-cache policy samba || rpm -q samba || samba --version
2. UPGRADE to 4.9.18 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade samba
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade samba
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 4.9.0 (Debian / Ubuntu)
apt-cache madison samba sudo apt install samba=<VERSION_BEFORE_4.9.0> sudo apt-mark hold samba
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list samba sudo dnf downgrade samba-<VERSION_BEFORE_4.9.0> sudo dnf versionlock add samba
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.
fedoraproject fedora MITIGATE
Affected: 30 · 31
Fixed in: no fixed release known
Safe to downgrade to: a release before 30
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
redhat storage DOWNGRADE
Affected: 3.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.0
1. Check installed version
apt-cache policy storage || rpm -q storage || storage --version
2. No fixed release: DOWNGRADE to a release before 3.0 (Debian / Ubuntu)
apt-cache madison storage sudo apt install storage=<VERSION_BEFORE_3.0> sudo apt-mark hold storage
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list storage sudo dnf downgrade storage-<VERSION_BEFORE_3.0> sudo dnf versionlock add storage
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.
redhat enterprise linux MITIGATE
Affected: 7.0 · 8.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
canonical ubuntu linux MITIGATE
Affected: 16.04 · 18.04 · 19.04 · 19.10
Fixed in: no fixed release known
Safe to downgrade to: a release before 16.04
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
synology directory server MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy directory-server || rpm -q directory-server || directory-server --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
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-2019-14907?

samba: upgrade to 4.9.18, 4.10.12, 4.11.5; fedora: mitigate or apply the listed mitigation; storage: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-14907 being exploited?

CVE-2019-14907 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-2019-14907 affect?

CVE-2019-14907 affects samba, fedora, storage. Severity is medium (CVSS 6.5). All samba versions 4.9.x before 4.9.18, 4.10.x before 4.10.12 and 4.11.x before 4.11.5 have an issue where if it is set with "log level = 3" (or above) then the string obtained from the client, after a failed character conversion, is printe

How urgent is CVE-2019-14907?

Priority 50/100. On your watchlist

Software pages

Ubuntu vulnerabilities · Samba vulnerabilities · Synology vulnerabilities

Related CVEs

References

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