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Netscaler Application Delivery ControllerApplication · Citrix

CVE-2024-5491

HIGH · 7.5 CVSS v3.1 Developing Published 2024-07-10
Fix available
A fix is available. Upgrade to 12.1-55.304 / 13.0-92.31 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Denial of Service in NetScaler ADC and NetScaler Gateway in NetScaler

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · low confidence
Developing — this CVE was published recently and its authoritative NVD entry is still being established, so we're holding a technical summary until the source data settles rather than publish something unreliable. Re-checking after 2026-08-01.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Netscaler Application Delivery ControllerApplication
Affected:>= 12.1, < 12.1-55.304>= 12.1, < 13.0-92.31>= 13.1, < 13.1-37.183>= 13.1, < 13.1-53.17>= 14.1, < 14.1-25.53
Netscaler GatewayApplication
Affected:>= 12.1, < 13.0-92.31>= 13.1, < 13.1-53.17>= 14.1, < 14.1-25.53

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 12.1-55.304 / 13.0-92.31 / 13.1-37.183 or later
Fixed in 12.1-55.30413.0-92.3113.1-37.183
Recommended fix High confidence

NetScaler ADC: 12.1-55.304 or later for 12.1 branch; 13.0-92.31 or later for 13.0 branch; 13.1-37.183 or later for 13.1-3x branch; 13.1-53.17 or later for 13.1-5x branch. NetScaler Gateway: 13.0-92.31 or later for 13.0 branch; 13.1-53.17 or later for 13.1 branch; 14.1-25.53 or later for 14.1 branch.

  1. 1. Identify the currently installed NetScaler ADC or Gateway version via the command line (nsconmsg -d current | grep -i version) or the GUI (System > Information > Version)
  2. 2. Determine the appropriate upgrade path based on the current version branch (12.1, 13.0, 13.1, or 14.1)
  3. 3. Download the corresponding fixed build from the Citrix download portal at https://www.citrix.com/downloads/netscaler-adc/
  4. 4. Review the Citrix upgrade documentation and release notes for the target version to understand prerequisites and migration considerations
  5. 5. Create a backup of the current NetScaler configuration via the GUI (System > Backup and Restore > Create Backup) or CLI (save ns config)
  6. 6. For High Availability (HA) deployments, plan to upgrade the secondary node first, then perform a failover, and upgrade the former primary node
  7. 7. Perform the upgrade using the Citrix GUI (System > Upgrade > Upload and Install) or CLI (shell cd /var/nsinstall && tar -xvzf <build>.tgz && ./installns.sh)
  8. 8. After upgrade, verify the new version is installed and the appliance is functioning correctly
Caveat Review Citrix release notes for the target build for any configuration changes or deprecated features; some upgrades may require specific configuration migration steps.

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,950. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-5491 in production — separate from our analysis above.

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What this is

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What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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