CVE-2025-5777

CRITICAL CISA KEV EPSS 100.0%
Published Jun 17, 20251y ago · Modified Jun 17, 20261w ago
9.3 CVSS 4.0
Critical
Find Similar
Published Jun 17, 2025 1y ago
Last Modified Jun 17, 2026 1w ago
KEV Listed Jul 10, 2025 11mo ago
KEV Due Jul 11, 2025 354d overdue

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

CVSS Details

Base Score
9.3
Exploitability
—
Impact
—
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
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

CISA Known Exploited Overdue 354d
Added
Jul 10, 2025
Due
Jul 11, 2025

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

EPSS Exploit Probability
100.0% percentile
Exploit & Patch Status
Actively Exploited (KEV)
No Patch Available

Weaknesses 3

CWE-125 Out-of-bounds Read Memory Safety
CWE-457
CWE-908

Affected Products 7

VendorProductVersionRange
citrixnetscaler_application_delivery_controller*≥12.1  –  <12.1-55.328
citrixnetscaler_application_delivery_controller*≥13.1  –  <13.1-37.235
citrixnetscaler_application_delivery_controller*≥13.1  –  <13.1-37.235
citrixnetscaler_application_delivery_controller*≥13.1  –  <13.1-58.32
citrixnetscaler_application_delivery_controller*≥14.1  –  <14.1-43.56
citrixnetscaler_gateway*≥13.1  –  <13.1-58.32
citrixnetscaler_gateway*≥14.1  –  <14.1-43.56

References 10

  • citrixbleed.com https://citrixbleed.com
    Broken LinkThird Party Advisory
  • doublepulsar.com https://doublepulsar.com/citrixbleed-2-exploitation-started-mid-june-how-to-spot-it-f3106392aa71
    Third Party Advisory
  • horizon3.ai https://horizon3.ai/attack-research/attack-blogs/cve-2025-5777-citrixbleed-2-write-up-maybe/
    Third Party Advisory
  • labs.watchtowr.com https://labs.watchtowr.com/how-much-more-must-we-bleed-citrix-netscaler-memory-disclosure-citrixbleed-2-cve-2025-5777/
    Third Party Advisory
  • reliaquest.com https://reliaquest.com/blog/threat-spotlight-citrix-bleed-2-vulnerability-in-netscaler-adc-gateway-devices/
    Third Party Advisory
  • support.citrix.com https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420
    Vendor Advisory
  • bleepingcomputer.com https://www.bleepingcomputer.com/news/security/cisa-tags-citrix-bleed-2-as-exploited-gives-agencies-a-day-to-patch/
    Press/Media CoverageThird Party Advisory
  • cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-5777
    US Government Resource
  • netscaler.com https://www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/
    Third Party Advisory
  • theregister.com https://www.theregister.com/2025/07/10/cisa_citrixbleed_kev/
    Press/Media Coverage

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.