CVE-2025-5777

Published Jun 17, 2025

Last updated 6 days ago

Exploit known CVSS critical 9.3

NetScaler ADC

NetScaler Gateway

Citrix

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-5777 is a vulnerability affecting NetScaler ADC and NetScaler Gateway. It is caused by insufficient input validation, which leads to a memory overread. The vulnerability can be exploited on devices configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or an AAA virtual server. An unauthorized attacker could potentially grab valid session tokens from the memory of internet-facing NetScaler devices by sending a malformed request. Successful exploitation could allow the attacker to gain access to the appliances.

Description: Insufficient input validation leading to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server
Source: secure@citrix.com
NVD status: Analyzed
Products: netscaler_application_delivery_controller, netscaler_gateway

Risk scores

CVSS 4.0

Type: Secondary
Base score: 9.3
Impact score: -
Exploitability score: -
Vector string: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Severity: CRITICAL

CVSS 3.1

Type: Primary
Base score: 7.5
Impact score: 3.6
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Severity: HIGH

Known exploits

Data from CISA

Vulnerability name: Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability
Exploit added on: Jul 10, 2025
Exploit action due: Jul 11, 2025
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Weaknesses

secure@citrix.com: CWE-125
nvd@nist.gov: CWE-908
134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-457

Hype score: Not currently trending

Configurations

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  {
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      {
        "negate": false,
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            "vulnerable": true,
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            "versionEndExcluding": "12.1-55.328",
            "versionStartIncluding": "12.1"
          },
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            "vulnerable": true,
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          },
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            "criteria": "cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*",
            "vulnerable": true,
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            "vulnerable": true,
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          },
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            "criteria": "cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "6484AA47-81F8-4EE6-9F33-96DEFE2F66E1",
            "versionEndExcluding": "14.1-43.56",
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          },
          {
            "criteria": "cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "2C86D66F-888F-4519-B700-9ADC4EE6913C",
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            "versionStartIncluding": "13.1"
          },
          {
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            "vulnerable": true,
            "matchCriteriaId": "D4E61FAA-9EAB-4F9B-887F-C5DC0DA0C633",
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        ],
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.