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CVE-2022-2850: A flaw was found In 389-ds-base

52
This month
MEDIUM 6.5WATCHLISTDOWNGRADEMITIGATEMITIGATE

CVE-2022-2850 is a medium-severity flaw (CVSS 6.5) affecting directory server, enterprise linux, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found In 389-ds-base. When the Content Synchronization plugin is enabled, an authenticated user can reach a NULL pointer dereference using a specially crafted query. This flaw allows an authenticated attacker to cause a denial of service. This CVE is assigned against an incomplete fix of CVE-2021-3514.

Why this priority

  • Public exploit reference
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score6.5 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance1.6% (top 25%)
CISA exploited listNo
WeaknessCWE-476
Published2022-10-14
Last modified2026-06-17
Publisher (CNA): Red Hat, Inc. · Vendor: debian · fedoraproject · port389 · redhat

Share: LinkedIn · X · Reddit

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

Am I affected?

Timeline

redhat directory server DOWNGRADE
Affected: 11.0 · 12.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 11.0
1. Check installed version
apt-cache policy directory-server || rpm -q directory-server || directory-server --version
2. No fixed release: DOWNGRADE to a release before 11.0 (Debian / Ubuntu)
apt-cache madison directory-server sudo apt install directory-server=<VERSION_BEFORE_11.0> sudo apt-mark hold directory-server
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list directory-server sudo dnf downgrade directory-server-<VERSION_BEFORE_11.0> sudo dnf versionlock add directory-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.
redhat enterprise linux MITIGATE
Affected: 6.0 · 7.0 · 8.0 · 9.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 6.0
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.
fedoraproject fedora MITIGATE
Affected: 35 · 36
Fixed in: no fixed release known
Safe to downgrade to: a release before 35
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.
port389 389-ds-base UPGRADE
Affected: >= 2.0.0 and <= 2.4.1
Fixed in: newer than 2.4.1
Safe to downgrade to: a release before 2.0.0
1. Check installed version
apt-cache policy 389-ds-base || rpm -q 389-ds-base || 389-ds-base --version
2. UPGRADE to newer than 2.4.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade 389-ds-base
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade 389-ds-base
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 2.0.0 (Debian / Ubuntu)
apt-cache madison 389-ds-base sudo apt install 389-ds-base=<VERSION_BEFORE_2.0.0> sudo apt-mark hold 389-ds-base
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list 389-ds-base sudo dnf downgrade 389-ds-base-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add 389-ds-base
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.
debian debian linux MITIGATE
Affected: 10.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 10.0
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.
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-2022-2850?

directory server: downgrade or apply the listed mitigation; enterprise linux: mitigate or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-2850 being exploited?

CVE-2022-2850 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-2022-2850 affect?

CVE-2022-2850 affects directory server, enterprise linux, fedora. Severity is medium (CVSS 6.5). A flaw was found In 389-ds-base. When the Content Synchronization plugin is enabled, an authenticated user can reach a NULL pointer dereference using a specially crafted query. This flaw allows an authenticated attacker to cause a denial of

How urgent is CVE-2022-2850?

Priority 52/100. Public exploit reference; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

References

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