Vulnerability Details CVE-2025-5777
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
Exploit prediction scoring system (EPSS) score
EPSS Score 0.058
EPSS Ranking 90.1%
CVSS Severity
CVSS v3 Score 7.5
Proposed Action
Citrix NetScaler ADC and Gateway contain an out-of-bounds read vulnerability due to insufficient input validation. This vulnerability can lead to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.
Ransomware Campaign
Unknown
References
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420
- https://horizon3.ai/attack-research/attack-blogs/cve-2025-5777-citrixbleed-2-write-up-maybe/
- https://labs.watchtowr.com/how-much-more-must-we-bleed-citrix-netscaler-memory-disclosure-citrixbleed-2-cve-2025-5777/
- https://www.bleepingcomputer.com/news/security/cisa-tags-citrix-bleed-2-as-exploited-gives-agencies-a-day-to-patch/
- https://www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/
- https://www.theregister.com/2025/07/10/cisa_citrixbleed_kev/
- https://doublepulsar.com/citrixbleed-2-exploitation-started-mid-june-how-to-spot-it-f3106392aa71
- https://reliaquest.com/blog/threat-spotlight-citrix-bleed-2-vulnerability-in-netscaler-adc-gateway-devices/
Products affected by CVE-2025-5777
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cpe:2.3:a:citrix:netscaler_application_delivery_controller:12.1
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cpe:2.3:a:citrix:netscaler_application_delivery_controller:12.1-55.297
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cpe:2.3:a:citrix:netscaler_application_delivery_controller:12.1-55.300
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cpe:2.3:a:citrix:netscaler_application_delivery_controller:12.1-55.302
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cpe:2.3:a:citrix:netscaler_application_delivery_controller:13.1
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cpe:2.3:a:citrix:netscaler_application_delivery_controller:13.1-37.159
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cpe:2.3:a:citrix:netscaler_application_delivery_controller:13.1-37.164
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cpe:2.3:a:citrix:netscaler_application_delivery_controller:13.1-37.176
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cpe:2.3:a:citrix:netscaler_application_delivery_controller:13.1-49.13
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cpe:2.3:a:citrix:netscaler_application_delivery_controller:13.1-49.15
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cpe:2.3:a:citrix:netscaler_application_delivery_controller:13.1-51.15
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cpe:2.3:a:citrix:netscaler_application_delivery_controller:14.1
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cpe:2.3:a:citrix:netscaler_application_delivery_controller:14.1-12.35
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cpe:2.3:a:citrix:netscaler_application_delivery_controller:14.1-8.50
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cpe:2.3:a:citrix:netscaler_gateway:13.1
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cpe:2.3:a:citrix:netscaler_gateway:13.1-49.13
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cpe:2.3:a:citrix:netscaler_gateway:13.1-49.15
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cpe:2.3:a:citrix:netscaler_gateway:13.1-51.15
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cpe:2.3:a:citrix:netscaler_gateway:13.1-52.19
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cpe:2.3:a:citrix:netscaler_gateway:13.1-53.24
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cpe:2.3:a:citrix:netscaler_gateway:13.1-54.29
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cpe:2.3:a:citrix:netscaler_gateway:13.1-55.34
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cpe:2.3:a:citrix:netscaler_gateway:13.1-56.18
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cpe:2.3:a:citrix:netscaler_gateway:13.1-57.26
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cpe:2.3:a:citrix:netscaler_gateway:14.1
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cpe:2.3:a:citrix:netscaler_gateway:14.1-12.35
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cpe:2.3:a:citrix:netscaler_gateway:14.1-17.38
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cpe:2.3:a:citrix:netscaler_gateway:14.1-21.57
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cpe:2.3:a:citrix:netscaler_gateway:14.1-25.56
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cpe:2.3:a:citrix:netscaler_gateway:14.1-29.72
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cpe:2.3:a:citrix:netscaler_gateway:14.1-34.42
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cpe:2.3:a:citrix:netscaler_gateway:14.1-38.53
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cpe:2.3:a:citrix:netscaler_gateway:14.1-4.42
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cpe:2.3:a:citrix:netscaler_gateway:14.1-8.50