Secuno
ENNL
Book demo

CVE-2026-88779

Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer

7.5 HIGHActively exploited (CISA KEV)EPSS 0.59%
  1. Published4 Oct 2026
  2. Added to CISA KEV4 Oct 2026
  3. Remediation due7 Oct 2026
Actively exploited (CISA KEV)

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.

Added to KEV: 4 Oct 2026Federal remediation due: 7 Oct 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Citrix NetScaler Application Delivery Controller≥ 13.1 < 13.1-64.28 · ≥ 14.1 < 14.1-73.41 · ≥ 13.1 < 13.1-37.282 · ≥ 14.1-66.68 ≤ 14.1-73.41
Citrix NetScaler Gateway≥ 13.1 < 13.1-64.28 · ≥ 14.1 < 14.1-73.41

Remediation

Fixed in
Citrix NetScaler Application Delivery Controller≥ 13.1-64.28
Citrix NetScaler Gateway≥ 13.1-64.28

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-962658.2
IBM Power Systems Firmware FW1060.00 through FW1060.81 is affected by a vulnerability…
CVE-2026-1089159.9
A vulnerability has been found in Edimax BR-6208AC 1.32. This affects an unknown part…
CVE-2026-1089149.9
A flaw has been found in Edimax BR-6208AC 1.32. Affected by this issue is some unknown…
CVE-2026-1088939.9
A vulnerability was identified in Linksys E1700 up to 1.0.0.4.003. This issue affects…
CVE-2026-10889210.0
A vulnerability was determined in Linksys E1700 1.0.0.4.003. This vulnerability affects…
CVE-2026-840588.1
IBM Guardium Data Protection 12.0, 12.1, and 12.2 is vulnerable to a buffer overrun in…

Frequently asked

Is CVE-2026-88779 being actively exploited?

Yes. CVE-2026-88779 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 4 Oct 2026.

How severe is CVE-2026-88779?

CVE-2026-88779 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.59% probability of exploitation.

Which products are affected by CVE-2026-88779?

Affected products include Citrix NetScaler Application Delivery Controller, Citrix NetScaler Gateway.

How do I fix CVE-2026-88779?

Upgrade affected software to a fixed version, for example Citrix NetScaler Application Delivery Controller 13.1-64.28, Citrix NetScaler Gateway 13.1-64.28 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-88779 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.