CVE-2025-7775

Citrix NetScaler: Memory Overflow

As of , CVE-2025-7775 in Citrix NetScaler 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 2025
US federal deadline
28 August 20252 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Not known to CISA
EPSS score
0.20Higher than 97% 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 per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

CISA's required action

What the flaw is

Citrix NetScaler ADC and NetScaler Gateway contain a memory overflow vulnerability that could allow for remote code execution and/or denial of service.

CISA's description

Memory overflow vulnerability leading to Remote Code Execution and/or Denial of Service in NetScaler ADC and NetScaler Gateway when NetScaler is configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server (OR) NetScaler ADC and NetScaler Gateway 13.1, 14.1, 13.1-FIPS and NDcPP: LB virtual servers of type (HTTP, SSL or HTTP_QUIC) bound with IPv6 services or servicegroups bound with IPv6 servers (OR) NetScaler ADC and NetScaler Gateway 13.1, 14.1, 13.1-FIPS and NDcPP: LB virtual servers of type (HTTP, SSL or HTTP_QUIC) bound with DBS IPv6 services or servicegroups bound with IPv6 DBS servers (OR) CR virtual server with type HDX

The CVE record's description, from Citrix

CVE published
26 August 2025
Assigned by
Citrix
CVSS
9.2 Critical (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
no
CISA SSVC, technical impact
total

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: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2026-19490Authentication Bypass Using an Alternate Path or ChannelCitrix NetScalerPatch nowForensic triage required by CISA0.23
CVE-2026-88772Improper Restriction of Operations within the Bounds of a Memory BufferCitrix NetScalerPatch nowForensic triage required by CISA; listed in the last 14 days0.01
CVE-2026-88771Improper Input ValidationCitrix NetScalerPatch nowForensic triage required by CISA; listed in the last 14 days0.01
CVE-2026-88779Improper Restriction of Operations within the Bounds of a Memory BufferCitrix NetScalerPatch nowForensic triage required by CISA; listed in the last 14 days0.01
CVE-2026-3055Out-of-Bounds ReadCitrix NetScalerPatch this weekMetasploit module0.04

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