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CVE-2023-3519

Citrix NetScaler ADC and NetScaler Gateway Code Injection

9.8 CRITICALActively exploited (CISA KEV)Used in ransomwarePublic exploitEPSS 99.7%
  1. Published19 Jul 2023
  2. Added to CISA KEV19 Jul 2023
  3. Remediation due9 Aug 2023
Actively exploited (CISA KEV)

Citrix NetScaler ADC and NetScaler Gateway contains a code injection vulnerability that allows for unauthenticated remote code execution.

Added to KEV: 19 Jul 2023Federal remediation due: 9 Aug 2023Used in ransomware

Description

Unauthenticated remote code execution

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Citrix NetScaler Application Delivery Controller≥ 13.0 < 13.0-91.13 · ≥ 13.1 < 13.1-49.13 · ≥ 12.1 < 12.1-55.297 · ≥ 13.1 < 13.1-37.159
Citrix NetScaler Gateway≥ 13.0 < 13.0-91.13 · ≥ 13.1 < 13.1-49.13

Remediation

Fixed in
Citrix NetScaler Application Delivery Controller≥ 13.0-91.13
Citrix NetScaler Gateway≥ 13.0-91.13

References

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Frequently asked

Is CVE-2023-3519 being actively exploited?

Yes. CVE-2023-3519 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 19 Jul 2023. It has been used in ransomware campaigns.

How severe is CVE-2023-3519?

CVE-2023-3519 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 99.7% probability of exploitation.

Which products are affected by CVE-2023-3519?

Affected products include Citrix NetScaler Application Delivery Controller, Citrix NetScaler Gateway.

How do I fix CVE-2023-3519?

Upgrade affected software to a fixed version, for example Citrix NetScaler Application Delivery Controller 13.0-91.13, Citrix NetScaler Gateway 13.0-91.13 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-3519 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.