Buffer overflow in Citrix Netscaler Application Delivery Controller
CVE-2026-8655
Multiple Memory overflow vulnerabilities in NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if NetScaler ADC is configured as an LB of type Oracle OR NetScaler ADC is configured as a DNS Proxy OR NetScaler ADC is configured as a DNS recursive resolver deployment
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (48.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Citrix Netscaler Application Delivery Controller — versions 14.1-66.68
- Citrix Netscaler Gateway
- Netscaler Adc — versions 14.1, 13.1, 14.1 FIPS
- Netscaler Gateway — versions 14.1, 13.1
Weakness classification (CWE)
References
- 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5 (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-8655?
- CVE-2026-8655 is a critical-severity vulnerability in Citrix Netscaler Application Delivery Controller, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2026-06-30.
- How severe is CVE-2026-8655?
- Critical severity. CVSS v3 base score is 9.8 out of 10.