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Known Exploited Vulnerability
8.7
HIGH CVSS 4.0
CVE-2026-88779
Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability - [Actively Exploited]
Overview
Description

Vulnerability in NetScaler ADC and NetScaler Gateway. This issue affects ADC: before 14.1-73.41, before 13.1-64.28, before 14.1-73.41 FIPS, and before 13.1-37.282; Gateway: before 14.1-73.41 and before 13.1-64.28.

Details
INFO

Published Date :

Oct. 4, 2026, 4:16 a.m.

Last Modified :

Oct. 5, 2026, 1:35 p.m.

Remotely Exploit :

Yes !

Source :

50a63c94-1ea7-4568-8c11-eb79e7c5a2b5
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Description :

Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a 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.

Known Ransomware Campaign Use:

Unknown

Notes :

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697174 ; https://community.citrix.com/techzone-blogs/110_security-updates/understanding-and-addressing-cve-2026-88779-in-citrix-netscaler-adc-and-citrix-netscaler-gateway/ ; 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-2026-88779

Impact
Affected Products

The following products are affected by CVE-2026-88779 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Citrix netscaler_application_delivery_controller
2 Citrix netscaler_gateway
: Total Affected Vendor : 1 | Products : 2
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1 HIGH [email protected]
CVSS 4.0 HIGH 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5
CVSS 4.0 HIGH 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5
Solution
Update NetScaler ADC and Gateway to a fixed version to remediate.
  • Update NetScaler ADC to version 14.1-73.41 or later.
  • Update NetScaler ADC to version 13.1-64.28 or later.
  • Update NetScaler Gateway to version 14.1-73.41 or later.
  • Update NetScaler Gateway to version 13.1-64.28 or later.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-88779.

URL Resource
https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697174 Vendor Advisory
https://community.citrix.com/techzone-blogs/110_security-updates/understanding-and-addressing-cve-2026-88779-in-citrix-netscaler-adc-and-citrix-netscaler-gateway/ Mitigation Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88779 US Government Resource
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-88779 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-88779 weaknesses.

CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-42: MIME Conversion MIME Conversion CAPEC-44: Overflow Binary Resource File Overflow Binary Resource File CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-100: Overflow Buffers Overflow Buffers CAPEC-123: Buffer Manipulation Buffer Manipulation

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-88779 vulnerability anywhere in the article.

  • TheCyberThrone
CVE-2026-102255: Critical Pre-Auth SSRF Vulnerability in SonicWall SMA1000

A new critical vulnerability in SonicWall SMA1000 appliances deserves immediate attention from organizations using the platform as an internet-facing remote-access gateway.Tracked as CVE-2026-102255, ... Read more

Published Date: Oct 08, 2026 (2 weeks, 3 days ago)
  • TheCyberThrone
CVE-2026-21589: Critical Atlassian Flaw Enables Unauthenticated File Access

Executive SummaryAtlassian has disclosed CVE-2026-21589, a critical arbitrary file access vulnerability affecting multiple Atlassian Data Center products.The vulnerability carries a CVSS v4.0 score of ... Read more

Published Date: Oct 07, 2026 (2 weeks, 4 days ago)
  • TheCyberThrone
Microsoft Releases Out-of-Band Exchange Security Update

October 6, 2026Executive SummaryMicrosoft has released an out-of-band security update for Exchange Server to address CVE-2026-96940, an Elevation of Privilege vulnerability that could allow an authent ... Read more

Published Date: Oct 06, 2026 (2 weeks, 5 days ago)
  • TheCyberThrone
CVE-2026-88779: NetScaler SAML Zero-Day Exploited in the Wild

A new Citrix NetScaler zero-day has moved quickly from discovery to active exploitation. CVE-2026-88779 affects NetScaler ADC and NetScaler Gateway deployments using SAML authentication and can cause ... Read more

Published Date: Oct 05, 2026 (2 weeks, 6 days ago)
  • The Hacker News
New NetScaler Zero-Day Exploited in Targeted Attacks Can Knock SAML Deployments Offline

Citrix has released security updates for a high-severity security flaw in NetScaler ADC and Citrix NetScaler Gateway that has been exploited as part of targeted zero-day attacks. The vulnerability, tr ... Read more

Published Date: Oct 05, 2026 (3 weeks ago)
  • security.nl
Citrix waarschuwt voor actief misbruik van nieuw beveiligingslek

Citrix waarschuwt klanten voor actief misbruik van een nieuw beveiligingslek in Citrix NetScaler ADC en Citrix NetScaler Gateway (CVE-2026-88779) dat tot een denial of service kan leiden. Herhaaldelij ... Read more

Published Date: Oct 04, 2026 (3 weeks ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-88779 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Oct. 05, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Added CPE Configuration OR *cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:* versions from (including) 13.1 up to (excluding) 13.1-64.28 *cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:* versions from (including) 14.1 up to (excluding) 14.1-73.41 *cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:* versions from (including) 13.1 up to (excluding) 13.1-37.282 *cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:* versions from (including) 14.1-66.68 up to (including) 14.1-73.41 *cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:* versions from (including) 13.1 up to (excluding) 13.1-37.282 *cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:* versions from (including) 13.1 up to (excluding) 13.1-64.28 *cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:* versions from (including) 14.1 up to (excluding) 14.1-73.41
    Added Reference Type CISA-ADP: https://community.citrix.com/techzone-blogs/110_security-updates/understanding-and-addressing-cve-2026-88779-in-citrix-netscaler-adc-and-citrix-netscaler-gateway/ Types: Mitigation, Vendor Advisory
    Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88779 Types: US Government Resource
    Added Reference Type NetScaler: https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697174 Types: Vendor Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Oct. 05, 2026

    Action Type Old Value New Value
    Removed SSVC {'id': 'CVE-2026-88779', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-10-04T19:34:09.964186Z'}
    Added SSVC {'id': 'CVE-2026-88779', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-10-04T00:00:00+00:00'}
  • CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725

    Oct. 04, 2026

    Action Type Old Value New Value
    Added Date Added 2026-10-04
    Added Due Date 2026-10-04
    Added Required Action 2026-10-04
    Added Vulnerability Name 2026-10-04
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Oct. 04, 2026

    Action Type Old Value New Value
    Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88779
    Removed SSVC {'id': 'CVE-2026-88779', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-10-04T14:37:26.606250Z'}
    Added SSVC {'id': 'CVE-2026-88779', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-10-04T19:34:09.964186Z'}
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Oct. 04, 2026

    Action Type Old Value New Value
    Added CWE CWE-119
    Added Reference https://community.citrix.com/techzone-blogs/110_security-updates/understanding-and-addressing-cve-2026-88779-in-citrix-netscaler-adc-and-citrix-netscaler-gateway/
    Added SSVC {'id': 'CVE-2026-88779', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-10-04T14:37:26.606250Z'}
  • New CVE Received by 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5

    Oct. 04, 2026

    Action Type Old Value New Value
    Added Description Vulnerability in NetScaler ADC and NetScaler Gateway. This issue affects ADC: before 14.1-73.41, before 13.1-64.28, before 14.1-73.41 FIPS, and before 13.1-37.282; Gateway: before 14.1-73.41 and before 13.1-64.28.
    Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
    Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/88xxx/CVE-2026-88779.json">CVE-2026-88779</a>
    Added Reference https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697174
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 8.7
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability
Base CVSS Score: 7.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact