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CVE-2026-88772

Memory overflow vulnerability leading to Remote Code Execution or Denial of Service

HIGH
8.1
CVSS Score
Published: September 27, 2026 at 04:09 PM UTC
Updated: September 28, 2026 at 12:26 PM UTC
3 products affected across 2 vendorsNetScaler GatewayNetscaler Application Delivery ControllerNetScaler ADC

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Severity
HIGH8.1
Exploitation
CISA KEV
Exploit prediction
EPSS 78%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score78.2%

EPSS (Exploit Prediction Scoring System) estimates a 78.2% chance this CVE is exploited in the wild within the next 30 days — higher than 100% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for remote code execution or denial of service

Required Action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Ransomware Use
Unknown
Added to KEV
Sep 27, 2026
Remediation Due
Sep 30, 2026
26 days overdue
Notes
Running the provided IOCs in the NetScaler console may help identify indicators of exploitation. Customers must conduct forensic triage as directed by BOD 26‑04 and follow Citrix’s published guidance for mitigations. For more information, please see: https://community.citrix.com/techzone-blogs/110_security-updates/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve-2026-88771-through-cve-2026-88778
https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096
https://support.citrix.com/external/article/CTX694799/steps-to-take-if-netscaler-adc-is-suspec.html
BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
https://nvd.nist.gov/vuln/detail/CVE-2026-88772

Description

Vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to Remote Code Execution or Denial of Service

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Netscaler Application Delivery Controller· Citrix
95%
13.1 ≤ v < 13.1-64.2313.1 ≤ v < 13.1.37.27914.1 ≤ v < 14.1-73.3714.1-66.68 ≤ v ≤ 14.1-73.37
Affected range stops below 13.1-64.23, so it looks safe — our inference, not a vendor statement
Affected range stops below 13.1.37.279, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.1-73.37, so it looks safe — our inference, not a vendor statement
NetScaler Gateway· Citrix
95%
v < 13.1-64.23v < 14.1-73.3713.1 ≤ v < 13.1-64.2314.1 ≤ v < 14.1-73.37
Affected range stops below 13.1-64.23, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.1-73.37, so it looks safe — our inference, not a vendor statement
NetScaler ADC· Citrix Netscaler
60%
v < 13.1-64.23v < 13.1.37.279 FIPS and NDcPPv < 14.1-73.37v < 14.1-73.37 FIPS
Affected range stops below 13.1-64.23, so it looks safe — our inference, not a vendor statement
Affected range stops below 13.1.37.279 FIPS and NDcPP, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.1-73.37, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.1-73.37 FIPS, so it looks safe — our inference, not a vendor statement

References (2)

Vendor Advisory
Source: cverecord
https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096&articleTitle=Citrix_NetScaler_ADC_and_Citrix_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_88771_CVE_2026_88772_CVE_2026_88773_CVE_2026_88774_CVE_2026_88775_CVE_2026_88776_CVE_2026_88777_and_CVE_2026_88778
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88772

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGH[email protected]
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-119

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