rootxsushant/Citrix-NetScaler-Memory-Leak-CVE-2025-5777

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GitHub
Analysisdeepseek-v4-pro:cloud ·

Technical assessment

A Python script that sends POST requests to a Citrix NetScaler endpoint and parses the response for a memory leak indicator in an <InitialValue> tag. It does not exploit the vulnerability to gain code execution or extract arbitrary memory; it only detects and reports the presence of leaked data.

Backdoor review

No backdoor observed in reviewed code

The supplied PoC is a Python script that sends POST requests to a target NetScaler endpoint and parses the response for a memory leak indicator. No backdoor, deceptive payload, or concealed operator-directed harm is present. The code performs only the advertised vulnerability demonstration.

ClassificationScanner
Model confidence95%
AuthenticationNot required
LanguagesPython
Target softwareCitrix NetScaler ADCCitrix NetScaler Gateway
Attack typesMemory Leak Detection
Evidence & reasoningClassification basis · observed behavior · safety review
Technical evidence

Classification basis and observed behavior

Classification basis

The script only sends crafted requests and parses the response to detect a memory leak indicator. It does not contain any payload to achieve code execution, privilege escalation, or arbitrary memory read beyond what the server voluntarily returns. The README describes it as a 'Proof-of-Concept (PoC)' but the code's operation is limited to detection and reporting, which matches the definition of a scanner.

CVE-2025-5777.py:56-61README.md:3

Requirements

  • Target must be a Citrix NetScaler configured as a Gateway or AAA virtual server with the vulnerable endpoint /p/u/doAuthentication.do accessible.CVE-2025-5777.py:68

Observed behavior

  • Sends a POST request with body 'login' to the target's /p/u/doAuthentication.do endpoint.CVE-2025-5777.py:70
  • Parses the HTTP response body for an <InitialValue> tag and prints its content as a hex dump if found.CVE-2025-5777.py:56-61
  • Repeats the request in a loop with configurable concurrency until interrupted or no leak is detected in the first round.CVE-2025-5777.py:100-113
Safety-review evidence

Behaviors behind the backdoor verdict

Observables

Network Request
POST to /p/u/doAuthentication.do with body 'login'The script sends a fixed POST request to the target to trigger the memory leak; no exfiltration or command channel is established.CVE-2025-5777.py:68-70
Data Extraction
Regex extraction of <InitialValue> tag from responseThe script extracts and displays memory content from the response, consistent with a memory leak PoC.CVE-2025-5777.py:52-61
Review boundaries

What the analysis did not establish

  • The analysis is based solely on static review of the provided source code; the code was not executed, and its actual behavior against a live target is not verified.
  • The vulnerability mechanism (how the POST to /p/u/doAuthentication.do triggers a memory overread) is not described in the artifact, so the exact nature of the leak is inferred from the CVE description and the script's parsing logic.
  • Review is limited to the supplied text files; no binary or non-text content was present.
  • The script's behavior depends on the aiohttp and colorama libraries, which were not reviewed.
Model interpretation

This review is limited to the supplied PoC code and context. It does not assert that the code works or is safe to execute.

Linked vulnerabilities

1