Security Digest · Vulnerability record
CVE-2025-7776: Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service
Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service in NetScaler ADC and NetScaler Gateway when NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) with PCoIP Profile bounded to it
CVSS 8.8 High EPSS 8.2% · p95 Check exposure
Should you act?
Normal patch cycle
No exploitation signal; fix it in your next routine update if you are affected. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 8.2%, percentile 95: FIRST’s model estimates a 8.2% chance of exploitation activity in the next 30 days, higher than 95% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Editorial verdict: Check exposure. NetScaler CVE-2025-7775: Exploited Pre-Auth Memory Overflow — Fixed since August 2025, but it was exploited before the patch to plant web shells; any appliance that ran an old build as a Gateway or AAA server back then needs a compromise check, and every NetScaler needs a far newer build today.
What it is
Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service in NetScaler ADC and NetScaler Gateway when NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) with PCoIP Profile bounded to it
Weakness type: CWE-119.
Product: NetScaler ADC · Assigned by: Citrix · Published: 2025-08-26
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| NetScaler | ADC | 14.1 < 47.48, 13.1 < 59.22, 13.1 FIPS and NDcPP < 37.241, 12.1 FIPS and NDcPP < 55.330 |
| NetScaler | Gateway | 14.1 < 47.48, 13.1 < 59.22, 13.1 FIPS and NDcPP < 37.241, 12.1 FIPS and NDcPP < 55.330 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| Citrix | 4.0 | 8.8 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:L |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Attack requirements: none
- Privileges required: none (no login)
- User interaction: none
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none, automatable yes, technical impact partial.
- FIRST EPSS (model of 2026-10-23): 8.21% probability of exploitation activity in the next 30 days; percentile 95.
Timeline
- — CVE record published by Citrix
- — erroneo.us brief: NetScaler CVE-2025-7775: Exploited Pre-Auth Memory Overflow
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- CVE.org record CVE-2025-7776 cve.org
- NVD entry CVE-2025-7776 nvd.nist.gov
Other references from the CVE record and advisory
- support.citrix.com support.citrix.com