CVE-2023-3519 Citrix NetScaler ADC and NetScaler Gateway Code Injection
Exploited in the wild
Critical 9.8
Published
Updated
Check this codebase for CVE-2023-3519 and fix it if it is affected.
What it is: CVE-2023-3519 is a critical vulnerability in Citrix NetScaler ADC, published on 19 Jul 2023.
Exploitation: Yes. Attackers have exploited CVE-2023-3519 in the wild since at least 19 Jul 2023, including in ransomware campaigns.
Affected product: Citrix NetScaler ADC. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2023-3519/ (Markdown: https://insights.sbomify.com/CVE-2023-3519/index.md)
- Exploited in the wild
- Since 19 Jul 2023
- Fix
- None listed
What is CVE-2023-3519?
CVE-2023-3519 is a critical vulnerability in Citrix NetScaler ADC, published on 19 Jul 2023.
Official description
Unauthenticated remote code execution
Weakness: CWE-94
Which versions are affected by CVE-2023-3519?
It affects 2 products.
Products include Citrix NetScaler ADC, Citrix Netscaler Gateway.
How do I fix CVE-2023-3519?
No fix has been published for CVE-2023-3519 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 9 Aug 2023.
Is CVE-2023-3519 being exploited?
Yes. Attackers have exploited CVE-2023-3519 in the wild since at least 19 Jul 2023, including in ransomware campaigns.
Public exploit code: 1 Metasploit module, 1 Nuclei template and 13 proofs of concept on GitHub.
Other vulnerabilities in Citrix NetScaler ADC
- CVE-2026-88771 Citrix NetScaler Improper Input Validation
- CVE-2026-88772 Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer
- CVE-2023-4966 Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow
- CVE-2026-19490 Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel
- CVE-2026-3055 Citrix NetScaler Out-of-Bounds Read
Sources
Also known as GHSA-m4j4-rmj5-w5gp.