CVE-2026-8452

Citrix NetScaler ADC and NetScaler Gateway: Improper Restriction of Operations within the Bounds of a Memory Buffer

As of , CVE-2026-8452 in Citrix NetScaler ADC and NetScaler Gateway is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch soon.

Exploited
Yes: CISA listed it on 26 August 2026
US federal deadline
29 August 20263 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Not known to CISA
EPSS score
0.01Higher than 61% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
Public exploit
None foundNeither Metasploit nor Exploit-DB lists one.
Fix
Vendor advice: support.citrix.comLinks below, from CISA's entry.

What CISA says to do

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.

CISA's required action

What the flaw is

Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability which could lead to denial of service.

CISA's description

Memory overflow vulnerability NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server

The CVE record's description, from NetScaler

CVE published
30 June 2026
Assigned by
NetScaler
CVSS
8.8 High (CVSS 4.0, from the CNA)
CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CISA SSVC, exploitation
active
CISA SSVC, automatable
yes
CISA SSVC, technical impact
partial

Timeline

  1. The CVE record was published.
  2. CISA added it to its list of exploited vulnerabilities.
  3. The US federal deadline to fix it.

NetScaler ADC and NetScaler Gateway: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2023-4966Buffer OverflowCitrix NetScaler ADC and NetScaler GatewayPatch this weekRansomware use; Metasploit module; EPSS 0.990.99
CVE-2023-3519Code InjectionCitrix NetScaler ADC and NetScaler GatewayPatch this weekRansomware use; Metasploit module; EPSS 0.990.99
CVE-2023-6549Buffer OverflowCitrix NetScaler ADC and NetScaler GatewayPatch this weekEPSS 0.580.58
CVE-2023-6548Code InjectionCitrix NetScaler ADC and NetScaler GatewayPatch soon0.03

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