CVE-2026-8655

Description

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

CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0046

Probability of exploitation

0.37%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-119 Buffer Overflow

Affected Products

Vendor	Product	Versions
citrix	netscaler_application_delivery_controller	< 13.1-37.272
citrix	netscaler_application_delivery_controller	< 13.1-37.272
citrix	netscaler_application_delivery_controller	13.1 — 13.1-63.18
citrix	netscaler_application_delivery_controller	14.1 — 14.1-72.61
citrix	netscaler_application_delivery_controller	All
citrix	netscaler_gateway	13.1 — 13.1-63.18
citrix	netscaler_gateway	14.1 — 14.1-72.61

References

Advisories & Patches

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696604

Frequently Asked Questions

What is 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 It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-8655? +

CVE-2026-8655 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0046, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-8655? +

CVE-2026-8655 affects products from citrix, specifically: netscaler_application_delivery_controller, netscaler_gateway. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-8655? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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