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CVE-2023-3519

99
FAUCET Score

CVE-2023-3519 is a critical unauthenticated remote code execution vulnerability affecting Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway products. This flaw allows attackers to execute arbitrary code without authentication, posing a severe risk to affected systems. With a CVSS score of 9.8 (CRITICAL) and an EPSS score indicating high exploitability, the vulnerability has a low attack complexity and can lead to complete compromise of confidentiality, integrity, and availability. It is actively exploited in the wild, including by ransomware campaigns, and public exploit modules are available, leading to significant community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 12.1, < 12.1-55.297CPE matchmatch criteria
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*
>= 12.1, < 12.1-55.297CPE matchmatch criteria
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*
>= 13.0, < 13.0-91.13CPE matchmatch criteria
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*
>= 13.1, < 13.1-37.159CPE matchmatch criteria
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*
>= 13.1, < 13.1-49.13CPE matchmatch criteria
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
99.72%
Probability of exploitation in next 30 days
EPSS Percentile
100.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
Added to KEV · Jul 19, 2023
Metasploit: Citrix ADC (NetScaler) Forms SSO Target RCE · Jul 18, 2023
Nuclei: CVE-2023-3519 · Oct 17, 2025
This CVE's current EPSS score of 0.9971 is in the 100th percentile among its peer group of 36,821 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

citrixvendor investigatingvia nvd_reference
View patch

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
packetstormsecurity.com / files/173997/Citrix-ADC-NetScaler-Remote-Code-Execution.html
ExploitThird Party AdvisoryVDB Entry
support.citrix.com / article/CTX561482/citrix-adc-and-citrix-gateway-security-bulletin-for-cve20233519-cve20233466-cve20233467
Vendor Advisory