Unrated

Memory overflow DoS in NetScaler ADC and NetScaler Gateway Gateway/AAA virtual server

IdentifiersCVE-2026-8452CWE-119

CVE-2026-8452 is a memory overflow vulnerability in Citrix NetScaler ADC and NetScaler Gateway. According to the provided advisory content, the flaw affects appliances when they are configured as a Gateway or as an AAA virtual server, including SSL VPN, ICA Proxy, CVPN, and RDP Proxy deployments. Successful triggering of the flaw can lead to unpredictable or erroneous behavior and denial of service. The provided content does not identify a specific vulnerable function or code path beyond the affected Gateway/AAA roles. The issue is described as remotely exploitable and has a reported CVSS score of 8.8.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can destabilize the affected NetScaler appliance, causing unpredictable or erroneous behavior and denial of service. In practice, this can interrupt remote access and authentication services exposed through Gateway or AAA virtual server configurations, including SSL VPN, ICA Proxy, CVPN, and RDP Proxy functionality. The provided content does not state that code execution or data disclosure results from exploitation of this CVE.

Mitigation

If you can’t patch tonight, do this now.

Apply the vendor updates as the primary mitigation. Until patching is completed, review whether the appliance is configured as a Gateway or AAA virtual server, restrict exposure and access to those services where operationally feasible, monitor for anomalous appliance behavior or service instability, and consider disabling vulnerable Gateway features if they are not required. The provided content does not describe a vendor-supplied configuration-only workaround specific to CVE-2026-8452.

Remediation

Patch, then assume compromise.

Upgrade affected systems to vendor-fixed releases identified in the Citrix security bulletin: NetScaler ADC and NetScaler Gateway 14.1-72.61 or later, NetScaler ADC and NetScaler Gateway 13.1-63.18 or later in the 13.1 branch, NetScaler ADC 14.1-FIPS 14.1-72.61 FIPS or later, and NetScaler ADC 13.1-FIPS / 13.1-NDcPP 13.1-37.272 or later. Affected versions are those before these fixed builds.

PUBLIC EXPLOITS

Exploits

No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.

VALID 0 / 1 TOTALView more in app

All candidate exploits were filtered out by Mallory's validation.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

Citrix SystemsNetscaler Adcapplication

Citrix SystemsNetscaler Gatewayapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

11 SOURCESView more in app

cyber security newsNews

Jul 1, 2026

Multiple Citrix NetScaler ADC and Gateway Vulnerabilities Enables DoS and Memory Overflow Attacks

A high-severity vulnerability in Citrix NetScaler ADC and NetScaler Gateway related to improper memory handling and insufficient input validation that can be exploited to cause denial-of-service or memory overflow conditions.

security weekNews

Jul 1, 2026

Citrix Patches NetScaler Vulnerabilities, Including New ‘HTTP/2 Bomb’ Attack - SecurityWeek

A high-severity NetScaler vulnerability fixed by Citrix; the article groups it among out-of-bounds read, memory overflow, and arbitrary file read bugs but does not map the exact bug type to this CVE.

the hacker newsNews

Jul 1, 2026

Citrix Patches Six NetScaler Flaws Allowing File Read and Denial-of-Service

A memory overflow vulnerability in Citrix NetScaler that can cause unpredictable behavior or denial of service when configured as a Gateway or AAA virtual server.

malware newsNews

Jun 30, 2026

Citrix security advisory (AV26-645) - Malware News - Malware Analysis, News and Indicators

A critical vulnerability addressed by Citrix in NetScaler ADC, NetScaler Gateway, and related FIPS/NDcPP editions.

+2 more in the timeline

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity4

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-8452

NVD

nvd.nist.gov/vuln/detail/CVE-2026-8452

MITRE CWE · CWE-119

cwe.mitre.org