CVE-2026-88777

Service interruption via undisclosed memory overflow

Published Sep 27, 2026 · Updated Sep 27, 2026

Memory overflow in Citrix NetScaler ADC and NetScaler Gateway allows attackers to cause erroneous behavior or interrupt service. Citrix has not published the affected component, the input that reaches it, or the memory operation that overflows. The source record does not specify privileges or user interaction, and reports unpredictable behavior or denial of service without code-execution evidence.

CVSS severityUnavailable
Unscored
EPSS probability0.38%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory overflow in Citrix NetScaler ADC and NetScaler Gateway allows attackers to cause erroneous behavior or interrupt service. Citrix has not published the affected component, the input that reaches it, or the memory operation that overflows. The source record does not specify privileges or user interaction, and reports unpredictable behavior or denial of service without code-execution evidence.

The record

CVE
CVE-2026-88777
Published
Sep 27, 2026
Updated
Sep 27, 2026
Vendor
Citrix
Product
Citrix ADC
Classifications
T1499
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <13.1.37.279 FIPS and NDcPP
  2. Affected versionversion=0 <13.1-64.23
  3. Affected versionversion=0 <14.1-73.37
  4. Affected versionversion=0 <14.1-73.37 FIPS

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Citrix · Citrix ADCversion=0 <13.1.37.279 FIPS and NDcPP; version=0 <13.1-64.23; version=0 <14.1-73.37; version=0 <14.1-73.37 FIPS
Citrix · Citrix Gatewayversion=0 <13.1-64.23; version=0 <14.1-73.37

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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