CVE-2026-8655Network attack vector

Unauthenticated denial of service via memory overflows

Published Jun 30, 2026 · Updated Jun 30, 2026

Memory overflows in NetScaler ADC and NetScaler Gateway allow remote attackers to cause service interruption through network traffic. NetScaler has not published the affected parser, buffer, or incorrect operation, but identifies Oracle load-balancing virtual servers, DNS proxy paths, and recursive DNS resolution as the reachable processing contexts. Exposure requires one of those configurations, and the vendor reports memory corruption with erroneous behavior or denial of service without distinguishing a crash from a hang.

CVSS severity8.8
High
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory overflows in NetScaler ADC and NetScaler Gateway allow remote attackers to cause service interruption through network traffic. NetScaler has not published the affected parser, buffer, or incorrect operation, but identifies Oracle load-balancing virtual servers, DNS proxy paths, and recursive DNS resolution as the reachable processing contexts. Exposure requires one of those configurations, and the vendor reports memory corruption with erroneous behavior or denial of service without distinguishing a crash from a hang.

The record

CVE
CVE-2026-8655
Published
Jun 30, 2026
Updated
Jun 30, 2026
Vendor
Cloud Software Group
Product
NetScaler Gateway
Classifications
CWE-119, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=13.1 <63.18
  2. Affected versionversion=14.1 <72.61

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cloud Software Group · NetScaler Gatewayversion=13.1 <63.18; version=14.1 <72.61
Cloud Software Group · NetScaler ADCversion=13.1 <63.18; version=13.1 FIPS and NDcPP <37.272; version=14.1 <72.61; version=14.1 FIPS <72.61

Published CVSS scores

8.8NetScalerCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:L
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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