CVE-2023-22521: This High severity RCE (Remote Code Execution) vulnerability was introduced in version 3.4.6 of Crowd Data Cen

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HIGH 8.8UPGRADE

CVE-2023-22521 is a high-severity flaw (CVSS 8.8) affecting crowd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This High severity RCE (Remote Code Execution) vulnerability was introduced in version 3.4.6 of Crowd Data Center and Server. This RCE (Remote Code Execution) vulnerability, with a CVSS Score of 8.0, allows an authenticated attacker to execute arbitrary code which has high impact to confidentiality, high impact to integrity, high impact to availability, and requires no user interaction. Atlassian recommends that Crowd Data Center and Server

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Published	2023-11-21
Last modified	2026-06-17

Publisher (CNA): Atlassian · Vendor: atlassian

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

Am I affected?

Timeline

2023-11-21 18:15 UTCPublished CVE record published
2026-06-17 05:35 UTCUpdated Record last modified

atlassian crowd UPGRADE

Affected: >= 3.4.0 and < 5.1.6 · 5.2.0

Fixed in: 5.1.6

Safe to downgrade to: a release before 3.4.0

1. Check installed version

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

2. UPGRADE to 5.1.6 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade crowd

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 3.4.0 (Debian / Ubuntu)

apt-cache madison crowd sudo apt install crowd=<VERSION_BEFORE_3.4.0> sudo apt-mark hold crowd

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list crowd sudo dnf downgrade crowd-<VERSION_BEFORE_3.4.0> sudo dnf versionlock add crowd

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-2023-22521?

crowd: upgrade to 5.1.6. Exact commands for each OS are on this page.

Is CVE-2023-22521 being exploited?

CVE-2023-22521 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-2023-22521 affect?

CVE-2023-22521 affects crowd. Severity is high (CVSS 8.8). This High severity RCE (Remote Code Execution) vulnerability was introduced in version 3.4.6 of Crowd Data Center and Server. This RCE (Remote Code Execution) vulnerability, with a CVSS Score of 8.0, allows an authenticated attacker to e

How urgent is CVE-2023-22521?

Priority 48/100. High severity

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References

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