CVE-2023-3519

Exp

Unauthenticated remote code execution

Published: 2023-07-19 Last update: 2025-10-24 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-3519 is rated Critical Active Threat (99/100): CVSS Critical severity, with high exploitation likelihood (EPSS 93.63%, 100th percentile). CISA KEV confirms active exploitation (added 2023-07-19) affecting Citrix / NetScaler ADC and NetScaler Gateway. a weakness (CWE-94) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2023-3519

Name: Citrix NetScaler ADC and NetScaler Gateway Code Injection Vulnerability · CISA KEV detail

Exploit added: 2023-07-19

Action due: 2023-08-09

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

Public exploit references (Exploit-DB) for CVE-2023-3519

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2023-3519

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-20 93.74% 93.63% -0.11%
2 2026-05-19 93.84% 93.74% -0.10%
3 2026-05-11 — 93.84% —

Full EPSS history (93 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-3519

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2023-3519

Affected software / configurations for CVE-2023-3519

Vendor Product Version Raw CPE
citrix netscaler_application_delivery_controller >= 12.1, < 12.1-55.297 cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*
citrix netscaler_application_delivery_controller >= 12.1, < 12.1-55.297 cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*
citrix netscaler_application_delivery_controller >= 13.0, < 13.0-91.13 cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*
citrix netscaler_application_delivery_controller >= 13.1, < 13.1-37.159 cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*
citrix netscaler_application_delivery_controller >= 13.1, < 13.1-49.13 cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*
citrix netscaler_gateway >= 13.0, < 13.0-91.13 cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*
citrix netscaler_gateway >= 13.1, < 13.1-49.13 cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*

References for CVE-2023-3519

cvelogic Threat Intelligence