CVE-2023-3519

Citrix NetScaler ADC and NetScaler Gateway: Code Injection

As of , CVE-2023-3519 in Citrix NetScaler ADC and NetScaler Gateway is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch this week.

Exploited
Yes: CISA listed it on 19 July 2023
US federal deadline
9 August 202321 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Known
EPSS score
0.99Higher than 99% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
EPSS when listed
No score that dayThe EPSS file of the day CISA listed it has no score for it.
Public exploit
1 Metasploit module
Fix
Vendor advice: support.citrix.comLinks below, from CISA's entry.

What CISA says to do

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

CISA's required action

What the flaw is

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

CISA's description

Unauthenticated remote code execution

The CVE record's description, from Citrix

CVE published
19 July 2023
Assigned by
Citrix
CVSS
9.8 Critical (CVSS 3.1, from the CNA)
CWE-94
Improper Control of Generation of Code ('Code Injection')
CISA SSVC, exploitation
active
CISA SSVC, automatable
no
CISA SSVC, technical impact
total

Timeline

  1. The CVE record was published.
  2. CISA added it to its list of exploited vulnerabilities.
  3. The US federal deadline to fix it.

Public exploits

Facts from Metasploit's module list and Exploit-DB's index; we never copy exploit code.

  • Metasploit: Citrix ADC (NetScaler) Forms SSO Target RCEexploit module, rank normal

NetScaler ADC and NetScaler Gateway: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2023-4966Buffer OverflowCitrix NetScaler ADC and NetScaler GatewayPatch this weekRansomware use; Metasploit module; EPSS 0.990.99
CVE-2023-6549Buffer OverflowCitrix NetScaler ADC and NetScaler GatewayPatch this weekEPSS 0.580.58
CVE-2023-6548Code InjectionCitrix NetScaler ADC and NetScaler GatewayPatch soon0.03
CVE-2026-8452Improper Restriction of Operations within the Bounds of a Memory BufferCitrix NetScaler ADC and NetScaler GatewayPatch soon0.01

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