9.8

CVE-2023-3519: Citrix NetScaler ADC and NetScaler Gateway Code Injection Vulnerability

CVSS: 9.8v3.1CriticalKEVRansomwareAnalyzed
Published 19-07-2023Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2023-3519 is a critical (CVSS 9.8) Code Injection vulnerability in Citrix NetScaler ADC and NetScaler Gateway. It is known to be exploited: CISA and ENISA list it, first on 19-07-2023. It has been used in ransomware campaigns. EPSS estimates a 99.75% chance of exploitation in the next 30 days, higher than 99.9% of scored vulnerabilities. 2 public exploits are recorded.

Overall risk
90/100
0100
Critical · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
99.75%
0%100%
Critical · 0.00 pp in 30 days
KEVListedCISA · ENISA
RansomwareKnown useFlagged by CISA, ENISA
Public exploits2reference, metasploit

Timeline

  1. 19-07-2023
    PublishedVulnerability first disclosed.
  2. 19-07-2023
    Added to CISA KEVCitrix NetScaler ADC and NetScaler Gateway Code Injection Vulnerability
  3. 09-08-2023
    CISA remediation dueApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  4. 23-01-2025
    Added to ENISA KEVAdded to the ENISA known exploited vulnerabilities catalog.
  5. 05-08-2026
    Last modifiedVulnerability information updated.

Description

Unauthenticated remote code execution

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

99.75%

Chance of exploitation in the next 30 days

Percentile

100%

Versus all other CVEs

30-day change

0.00 pp

From 99.75% on 18-09-2026

18-09-202618-10-2026
EPSS score
99.75%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
19-07-2023
Federal due date
09-08-2023
Ransomware
ENISA CNWListed
Added
23-01-2025
Ransomware

CISA required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. support.citrix.com/article/… nvd.nist.gov/vuln/detail/CVE-2023-3519

Public exploits

2 found
  • referenceUnverified

    Exploit Reference (packetstormsecurity.com)

    Maturity: unknown

  • MetasploitMetasploitremoteUnverified

    Citrix ADC (NetScaler) Forms SSO Target RCE

    exploit/freebsd/http/citrix_formssso_target_rce

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Citrix3 products
  • netscaler adc≥ 13.1, < 49.13 | ≥ 13.0, < 91.13 | ≥ 13.1-FIPS, < 37.159 | ≥ 12.1-FIPS, < 55.297 | ≥ 12.1-NDcPP, < 55.297
  • netscaler_application_delivery_controller≥ 12.1, < 12.1-55.297 | ≥ 13.0, < 13.0-91.13 | ≥ 13.1, < 13.1-37.159 | ≥ 13.1, < 13.1-49.13
  • netscaler_gateway≥ 13.1, < 49.13 | ≥ 13.0, < 91.13 | ≥ 13.0, < 13.0-91.13 | ≥ 13.1, < 13.1-49.13

1 vendor · 3 products

References

3 links