Home/CVE/Citrix NetScaler ADC and NetScaler Gateway Code Injection Vulnerability
CVE

CVE-2023-3519

Citrix NetScaler ADC and NetScaler Gateway Code Injection Vulnerability

Unauthenticated remote code execution.

CRITICAL · CVSS 9.8 ⚠ CISA KEV EPSS 0.93629 Ransomware: known
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • Linked to known ransomware campaigns
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules10 YARA rules5
⬢

Required Remediation

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

◆

Threat Actors Linked

19
actorALPHV / BlackCat
actorBlack Basta
actorCuba
actorFlax Typhoon
actorImperial Kitten
actorINC Ransom
⬡

Weakness Classification

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-94Improper Control of Generation of Code ('Code Injection')
▤

Affected Products & Versions

6
citrix netscaler application delivery controller>= 12.1 and < 12.1-55.297
citrix netscaler application delivery controller>= 13.0 and < 13.0-91.13
citrix netscaler application delivery controller>= 13.1 and < 13.1-37.159
citrix netscaler application delivery controller>= 13.1 and < 13.1-49.13
citrix netscaler gateway>= 13.0 and < 13.0-91.13
citrix netscaler gateway>= 13.1 and < 13.1-49.13
⚠

Public Exploits & PoCs

2
nucleiCitrix NetScaler ADC and NetScaler Gateway - Remote Code Executioncritical
pocpacketstormsecurity.com · Citrix-ADC-NetScaler-Remote-Code-Execution.htmlpacketstormsecurity.com
◈

Detection Rules (IDS/IPS)

1
et-openET WEB_SPECIFIC_APPS Citrix/Netscaler ADC and NetScaler Gateway RCE Attempt CVE-2023-3519attempted-admin
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
◈

Sigma Hunt Rules

10
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
relatedcriticalBitbucket Unauthorized Full Data Export Triggered
relatedcriticalAntivirus Exploitation Framework Detection
relatedcriticalAntivirus Password Dumper Detection
relatedcriticalAntivirus Ransomware Detection
relatedcriticalLinux Reverse Shell Indicator
relatedcriticalWebshell Remote Command Execution
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · secure@citrix.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD19 Jul 2023 · 06:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

2
cisaKEV-CVE-2023-3519
splunk-security-content76ac2dcb-333c-4a77-8ae9-2720cfae47a8
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-3519US Government Resource
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