CVE-2023-3519
Confirmed PUBLISHEDUnauthenticated remote code execution
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
Unauthenticated remote code execution
- CVE Published
- Jul 19, 2023
- Exploitation Reported
- Jul 19, 2023
- CVSS
- 9.8 Critical
- EPSS
- 99.7%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Citrix |
NetScaler ADC
|
13.1 to < 49.13 |
Affected |
| Citrix |
NetScaler ADC
|
13.0 to < 91.13 |
Affected |
| Citrix |
NetScaler ADC
|
13.1-FIPS to < 37.159 |
Affected |
| Citrix |
NetScaler ADC
|
12.1-FIPS to < 55.297 |
Affected |
| Citrix |
NetScaler ADC
|
12.1-NDcPP to < 55.297 |
Affected |
| Citrix |
NetScaler Gateway
|
13.1 to < 49.13 |
Affected |
| Citrix |
NetScaler Gateway
|
13.0 to < 91.13 |
Affected |
CVE References
- support.citrix.com/article/CTX561482/citrix-adc-and-citrix-gate... support.citrix.com · CVE Record https://support.citrix.com/article/CTX561482/citrix-adc-and-citrix-ga...
- packetstormsecurity.com/files/173997/Citrix-ADC-NetScaler-Remote-Cod... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/173997/Citrix-ADC-NetScaler-Remo...
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2023-07-19 00:00 UTC |
| The Shadowserver | 2026-07-08 00:00 UTC |
Scanner Artifacts
Nuclei and Metasploit references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-3519.yaml | Jun 01, 2026 |
| Metasploit | https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/freebsd/http/citrix_formssso_target_rce.rb | Apr 28, 2025 |
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Status
Exploited in the wild
Recorded 2023-07-19 00:00:00 UTC · CISA
Used in malware
Recorded 2023-07-19 00:00:00 UTC · CISA
Proof of concept available
Recorded 2023-07-21 08:55:28 UTC · GitHub
Weaknesses (CWE)
-
Improper Control of Generation of Code ('Code Injection')
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-3519.yaml | Jun 01, 2026 |
| Metasploit | https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/freebsd/http/citrix_formssso_target_rce.rb | Apr 28, 2025 |
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2023-10-27 18:39:31 UTC · 5 stars
Stack-Overflow on Citrix
github · Created 2023-08-24 12:24:24 UTC · 5 stars
Citrix ADC RCE CVE-2023-3519
github · Created 2023-07-21 22:10:03 UTC · 11 stars
CVE-2023-3519 vuln for nuclei scanner
github · Created 2023-07-21 20:17:43 UTC · 223 stars
RCE exploit for CVE-2023-3519
github · Created 2023-07-21 08:55:28 UTC · 15 stars
nuclei · Created Unknown
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC 14 days ago00:00 UTC · 14 days ago
KEV confirmed by The Shadowserver
Exploitation attested by an external source
-
15:34 UTC about 2 months ago15:34 UTC · about 2 months ago
Nuclei template available
Scanner coverage available
-
15:02 UTC about 1 year ago15:02 UTC · about 1 year ago
Metasploit module available
Exploit module available
-
08:55 UTC about 3 years ago08:55 UTC · about 3 years ago
Public PoC available
Public proof-of-concept code published
-
17:51 UTC about 3 years ago17:51 UTC · about 3 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC about 3 years ago00:00 UTC · about 3 years ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
00:00 UTC about 3 years ago00:00 UTC · about 3 years ago
First public exploitation report
Exploit observed in malware
-
22:22 UTC about 3 years ago22:22 UTC · about 3 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2023-3519
{
"cve_id": "CVE-2023-3519",
"title": "Unauthenticated remote code execution",
"affected_vendor": "Citrix",
"affected_product": "NetScaler ADC, NetScaler Gateway",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 9.8,
"epss_score": 0.99715,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}