Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2023-3519 is a critical-severity Code Injection (CWE-94) vulnerability in Citrix Netscaler Application Delivery Controller. Its CVSS base score is 9.8 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Junk Data (T1001.001); ranked in the top 0.0% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2023-3519 is an unauthenticated remote code execution vulnerability (CWE-94) affecting Citrix ADC and Citrix Gateway appliances. It carries a CVSS 3.1 base score of 9.8, reflecting network attack vector, low attack complexity, and no requirements for authentication or user interaction, with high impact on confidentiality, integrity, and availability.
An unauthenticated attacker with network access can send specially crafted requests that trigger arbitrary code execution on the target appliance, enabling full compromise of the affected system including potential takeover of VPN sessions, authentication flows, or connected infrastructure.
Citrix security bulletin CTX561482 addresses the issue with patches and configuration guidance for supported ADC and Gateway versions; the bulletin is referenced by both vendor and CISA entries. CISA has added the CVE to its Known Exploited Vulnerabilities catalog, confirming observed in-the-wild exploitation.
Public exploit code is available on Packet Storm, and the vulnerability maintains a very high EPSS score (current 0.9348, peak 0.9659), indicating sustained exploitation interest after disclosure.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-44176
Vulnerability Data
Unauthenticated remote code execution
- CWE(s)
- KEV Date Added
- 19 July 2023
Related Threats
Threat-Actor AttributionAI
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
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V1.3.1
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Makes persistent code injection into loaded programs impossible when the executable image itself resides on hardware-protected read-only media.
Dynamically generated code can be produced and executed inside the isolated chamber, preventing host compromise from code-injection payloads.
Validates inputs used in dynamic code generation to block injected directives.
Directly prevents execution of attacker-supplied code written into data memory regions.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
PR.PS-06's SDLC practices directly target injection flaws via secure coding and testing (mostly), yet as a single broad outcome it leaves many code-generation specifics unaddressed (partial).
PR.DS-10 protects runtime data confidentiality/integrity but has no bearing on neutralizing externally influenced input during code generation, so neither direction shows any preventive effect.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.