CVE-2025-5777: Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability
Vulnerability summary
CVE-2025-5777 is a critical (CVSS 9.3) Out-of-bounds Read vulnerability in Citrix NetScaler ADC and Gateway. It is known to be exploited: CISA lists it, first on 10-07-2025. It has been used in ransomware campaigns. EPSS estimates a 99.97% chance of exploitation in the next 30 days, higher than 99.9% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 17-06-2025PublishedVulnerability first disclosed.
- 10-07-2025Added to CISA KEVCitrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability
- 11-07-2025CISA remediation dueApply mitigations per vendor instructions.
- 07-10-2026Last modifiedVulnerability information updated.
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 metrics
3 scores · 2 sources · 2 versions- NVDNIST9.3CriticalCVSS: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
EPSS trend
Probability
99.97%
Chance of exploitation in the next 30 days
Percentile
100%
Versus all other CVEs
30-day change
0.00 pp
From 99.97% on 18-09-2026
Known exploited
Compare KEV catalogs
CISA KEVListed- Added
- 10-07-2025
- Federal due date
- 11-07-2025
CISA 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. support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420 nvd.nist.gov/vuln/detail/CVE-2025-5777
Public exploits
1 foundCitrix NetScaler ADC/Gateway 14.1 - Memory Disclosure
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Citrix2 products
- netscaler_application_delivery_controller≥ 12.1, < 12.1-55.328 | ≥ 13.1, < 13.1-37.235 | ≥ 13.1, < 13.1-58.32 | ≥ 14.1, < 14.1-43.56
- netscaler_gateway≥ 13.1, < 13.1-58.32 | ≥ 14.1, < 14.1-43.56
2 vendors · 4 products
References
10 links- doublepulsar.com/citrixbleed-2-exploitation-started-mid-june-how-to-spot-it-f3106392aa71Third Party AdvisoryTechnical DescriptionSignature
- reliaquest.com/blog/threat-spotlight-citrix-bleed-2-vulnerability-in-netscaler-adc-gateway-devices/Media CoverageThird Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-5777Government ResourceUS Government Resource
- www.theregister.com/2025/07/10/cisa_citrixbleed_kev/Press/Media Coverage