Vulnerability details
CVE-2025-5777
Actively exploited
NetScaler ADCNetScaler Gateway
NetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overread
CVSS 4.0
9.3Critical
Remedy
Required action (CISA): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. (due: 2025-07-11)
Versions not listed as affected in the CVE record:
- ADC — version 43.56 and later
- ADC — version 58.32 and later
- Gateway — version 43.56 and later
- Gateway — version 58.32 and later
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.3Critical | 4.0 | CVEProject cvelistV5 (CNA) (Citrix) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| NetScaler | ADC | 13.1 ≤ v < 58.32 | CVEProject cvelistV5 (CNA) |
| NetScaler | ADC | 14.1 ≤ v < 43.56 | CVEProject cvelistV5 (CNA) |
| NetScaler | Gateway | 13.1 ≤ v < 58.32 | CVEProject cvelistV5 (CNA) |
| NetScaler | Gateway | 14.1 ≤ v < 43.56 | CVEProject cvelistV5 (CNA) |
References and advisories
10- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420
- https://doublepulsar.com/citrixbleed-2-exploitation-started-mid-june-how-to-spot-it-f3106392aa71 third-party-advisorytechnical-descriptionsignature
- https://reliaquest.com/blog/threat-spotlight-citrix-bleed-2-vulnerability-in-netscaler-adc-gateway-devices/ media-coverage
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-5777 government-resource
- https://www.bleepingcomputer.com/news/security/cisa-tags-citrix-bleed-2-as-exploited-gives-agencies-a-day-to-patch/
- https://labs.watchtowr.com/how-much-more-must-we-bleed-citrix-netscaler-memory-disclosure-citrixbleed-2-cve-2025-5777/
- https://www.theregister.com/2025/07/10/cisa_citrixbleed_kev/
- https://horizon3.ai/attack-research/attack-blogs/cve-2025-5777-citrixbleed-2-write-up-maybe/
- https://www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/
- https://citrixbleed.com
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Details
- Published
- 2025-06-17
- Last updated
- 2026-10-07
- State
- Published
- Assigner (CNA)
- Citrix
- Kolun priority
- 79 · High
CISA KEV catalog
- Date added
- 2025-07-10
- Due date
- 2025-07-11
- Used in ransomware
- Yes
Exploit prediction (EPSS)
99.97%
Probability of exploitation in 30 days
99.9%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Active
- Technical impact
- Total
Weaknesses (CWE)
- CWE-125Out-of-bounds Read