Is CVE-2023-3519 in the CISA KEV catalog?

Yes. CVE-2023-3519 is on the CISA Known Exploited Vulnerabilities list, added 2023-07-19, and has known ransomware campaign use.

What is the CVSS severity of CVE-2023-3519?

CVE-2023-3519 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2023-3519?

CVE-2023-3519 has an EPSS score of 99.72% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-3519?

Upgrade netscaler application delivery controller to 12.1-55.297 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2023-3519

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

Description

Unauthenticated remote code execution

CWE-94Code Injection

How to fix

Remediation Available

netscaler application delivery controllerNVD

Affected:>= 12.1, < 12.1-55.297Fixed in:12.1-55.297CVE-2023-3519derived from NVD

Affected:>= 13.1, < 13.1-37.159Fixed in:13.1-37.159CVE-2023-3519derived from NVD

Affected:>= 13.1, < 13.1-49.13Fixed in:13.1-49.13CVE-2023-3519derived from NVD

netscaler gatewayNVD

Affected:>= 13.1, < 13.1-49.13Fixed in:13.1-49.13CVE-2023-3519derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

99.72%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Citrix NetScaler ADC and NetScaler Gateway Code Injection Vulnerability

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

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Remediation due: 2023-08-09

Associated with ransomware campaigns

References

Exploit1

packetstormsecurity.com

Vendor Advisory1

support.citrix.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-94 (Code Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-9841	Critical	9.8	100%	KEV	Fix
CVE-2015-1635	Critical	9.8	100%	KEV	-
CVE-2022-22954	Critical	9.8	100%	KEV + Ransom	-
CVE-2025-3248	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2021-22204	Medium	6.8	100%	KEV	Fix
CVE-2012-0158	High	8.8	100%	KEV	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-24.