CVE-2025-5777
BaseFortify
Publication date: 2025-06-17
Last updated on: 2025-10-30
Assigner: Citrix Systems, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| citrix | netscaler_application_delivery_controller | From 12.1 (inc) to 12.1-55.328 (exc) |
| citrix | netscaler_application_delivery_controller | From 13.1 (inc) to 13.1-37.235 (exc) |
| citrix | netscaler_application_delivery_controller | From 13.1 (inc) to 13.1-37.235 (exc) |
| citrix | netscaler_application_delivery_controller | From 13.1 (inc) to 13.1-58.32 (exc) |
| citrix | netscaler_application_delivery_controller | From 14.1 (inc) to 14.1-43.56 (exc) |
| citrix | netscaler_gateway | From 13.1 (inc) to 13.1-58.32 (exc) |
| citrix | netscaler_gateway | From 14.1 (inc) to 14.1-43.56 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-125 | The product reads data past the end, or before the beginning, of the intended buffer. |
| CWE-457 | The code uses a variable that has not been initialized, leading to unpredictable or unintended results. |
| CWE-908 | The product uses or accesses a resource that has not been initialized. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is caused by insufficient input validation in the NetScaler Management Interface of NetScaler ADC and NetScaler Gateway, which leads to a memory overread condition.
How can this vulnerability impact me? :
The vulnerability can lead to unauthorized access or exposure of sensitive information due to memory overread, potentially compromising the confidentiality and integrity of the affected systems.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
Detection of CVE-2025-5777 involves multiple approaches: 1) Using the Citrix Bleed 2 Checker tool, which performs a non-destructive heuristic scan by verifying the target is a Citrix/NetScaler endpoint and sending crafted requests to detect memory leakage in the <InitialValue> XML response. 2) Monitoring Netscaler web access logs for abnormal volumes of POST requests to the endpoint /p/u/doAuthentication.do, especially those with unusual Content-Length headers (e.g., Content-Length: 5). 3) Identifying corrupted or suspicious log entries containing binary or non-printable characters in user fields (e.g., ns.log with debug logging enabled). 4) Spotting session anomalies such as session reuse from multiple IP addresses or source IPs differing from client IPs, indicating possible session hijacking. 5) Using NetScaler CLI commands to audit active sessions, such as 'show sessions' or 'show icaconnection', to identify suspicious activity. 6) Replay of stolen NSC_AAAC cookies can confirm active exploitation. These detection methods combine network traffic analysis, log inspection, and active scanning with specialized tools. [1, 2, 3, 5, 6]
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include: 1) Applying the official patches released by Citrix for affected NetScaler ADC and Gateway versions (e.g., 14.1-43.56+, 13.1-58.32+, 13.1-FIPS/NDcPP 13.1-37.235+). 2) After patching, disconnect all active ICA and PCoIP sessions by using NetScaler CLI commands 'kill icaconnection -all' and 'kill pcoipconnection -all' to terminate potentially compromised sessions. 3) If immediate patching is not feasible, restrict external network access to vulnerable NetScaler devices using firewall rules or access control lists (ACLs) to limit exposure. 4) Monitor for suspicious session activity and unusual HTTP request patterns as part of ongoing detection and response. 5) Follow guidance from CISA and Citrix, including reviewing sessions via 'show icaconnection' and 'show sessions' commands and terminating suspicious connections. 6) Consider discontinuing use of affected products if mitigations cannot be applied promptly. There are no alternative mitigations other than patching and session termination. [4, 6, 8]