CVE-2025-5777 KEV EXPLOIT
7.5
HIGH · CVSS 3.1 · EPSS 100% (pctl 100)
Patch first
On CISA KEV — known exploited in the wild, due 2025-07-11.
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
Scoring
| CVSS | 7.5 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| EPSS | 99.97% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-125 |
| On CISA KEV | yes — remediate by 2025-07-11 |
| Public exploit | yes |
| Published | 2025-06-17 |
| Last modified | 2026-08-04 |
CISA KEV
| Name | Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability |
|---|---|
| Added | 2025-07-10 |
| Due | 2025-07-11 |
| Vendor / product | Citrix / NetScaler ADC and Gateway |
| Ransomware use | known |
Affected (2)
| Vendor | Product |
|---|---|
| citrix | netscaler application delivery controller |
| citrix | netscaler gateway |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Citrix NetScaler ADC/Gateway 14.1 - Memory Disclosure | 2025-08-11 |
References
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420
- https://citrixbleed.com
- 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/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-5777
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