CVE-2023-3519
CriticalExploitedPublic exploitUnauthenticated remote code execution
Published Jul 19, 2023 · Updated Aug 5, 2026
Key Facts
Patch immediately- CVE-2023-3519 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Netscaler Application Delivery Controller (Citrix), NetScaler Gateway (Citrix).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jul 18, 2023 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 100% probability of exploitation in the next 30 days.
- Fixed versions are available, including Netscaler Application Delivery Controller 12.1-55.297, Netscaler Application Delivery Controller 13.0-91.13, Netscaler Application Delivery Controller 13.1-37.159.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
100%
Higher than 99.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2023-3519 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Unauthenticated remote code execution
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Jul 19, 2023 | Aug 9, 2023 | Known |
| Industry KEV feed | Jul 18, 2023 | Aug 9, 2023 | Known |
| CIRCL KEV | Jul 19, 2023 | Aug 9, 2023 | Known |
| ENISA EUVD | Jul 19, 2023 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Netscaler Application Delivery ControllerCitrix | >= 13.1 | 13.0-91.13 |
| NetScaler GatewayCitrix | >= 13.1 | 13.0-91.13 |
Patched Releases
Netscaler Application Delivery Controller
12.1-55.297, 13.0-91.13, 13.1-37.159, 13.1-49.13, 37.159, 49.13, 55.297, 91.13
NetScaler Gateway
13.0-91.13, 13.1-49.13, 49.13, 91.13
Timeline
Added to Industry KEV feed
Jul 18, 2023
Publicly disclosed
Jul 19, 2023
Added to CISA KEV
Jul 19, 2023
Added to CIRCL KEV
Jul 19, 2023
Added to ENISA EUVD
Jul 19, 2023
Last updated
Aug 5, 2026
Weakness Type
- CWE-94 Improper Control of Generation of Code ('Code Injection')
References
- advisoryVulnCheck exploitation report
- advisoryhttps://www.securityweek.com/citrix-patches-high-severity-vulnerabilities-in-windows-linux-apps/
- advisoryhttps://www.securityweek.com/exploitation-of-new-citrix-zero-day-likely-to-increase-organizations-warned/
- advisoryUSOM advisory
- exploithttp://packetstormsecurity.com/files/173997/Citrix-ADC-NetScaler-Remote-Code-Execution.html
FAQ
Common Questions.
Unauthenticated remote code execution
Affected: Netscaler Application Delivery Controller (Citrix) versions >= 13.1; NetScaler Gateway (Citrix) versions >= 13.1. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jul 18, 2023 and is known to be used in ransomware campaigns.
Yes. It was added on Jul 19, 2023 with a federal remediation due date of Aug 9, 2023.
Public exploit code is available.
Fixed versions are available, including Netscaler Application Delivery Controller 12.1-55.297, Netscaler Application Delivery Controller 13.0-91.13, Netscaler Application Delivery Controller 13.1-37.159.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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