VULNpocalypse

CVE-2025-7775: Citrix NetScaler Memory Overflow Vulnerability

Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.

Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.

What it is

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

Description quoted from the CVE record (assigned by Citrix, published 2025-08-26).

Weakness: CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

How it can be exploited

Exploitable over the network with high attack complexity only when specific conditions are present needing no privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: no. Technical impact: total.

On CISA KEV since
2025-08-26
US federal deadline
2025-08-28
Ransomware use
Not known

Public exploit evidence (Exploit Observer)

Also known as: BDU:2025-10349, CNNVD-202508-3110, EUVD-2025-25838, GHSA-2m4h-vp37-6746

VEDAS cluster: VEDAS:FLUORESCENTFIG

Exploit Observer links 11 pieces of public exploit code or detection modules that name this CVE or one of its aliases.

Exploit code and modules (11)

Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.

Research and write-ups (1)

Vulnerability databases and vendor advisories (9)

Catalogue entries, not exploit evidence.

51 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.

VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.

Live scores

EPSS
0.207
likely to be attacked soon
VEDAS
0.984
strong exploit evidence
On CISA KEV
Yes, since 2025-08-26
Detection rule
Nuclei · Suricata
EPSS (chance of attack)
10No cve-scores data 2026-02-22 to 2026-08-08no data0.1CVE-2025-7775 EPSS over time2025-082026-11-01
VEDAS (exploit evidence)
10No cve-scores data 2026-02-22 to 2026-08-08no data0.9CVE-2025-7775 VEDAS over time2025-082026-11-01

Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish.

Who is affected

ProductAffectedNot affected
NetScaler ADCfrom 14.1 before 47.48
from 13.1 before 59.22
from 13.1 FIPS and NDcPP before 37.241
from 12.1 FIPS and NDcPP before 55.330		Not stated
NetScaler Gatewayfrom 14.1 before 47.48
from 13.1 before 59.22
from 13.1 FIPS and NDcPP before 37.241
from 12.1 FIPS and NDcPP before 55.330		Not stated

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

Exploit Observer also maps it to: citrix netscaler_application_delivery_controller, citrix netscaler_gateway, citrix_systems_inc. netscaler_gateway.

How to fix it

Fixed versions stated in the CVE record: 47.48, 59.22, 37.241, 55.330.

CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Vendor guidance:

How to detect it

Nuclei template (active check)

Citrix - Memory Corruption

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.

Name and description quoted from the template, written by VEDAS.

The template sends 1 request (GET /logon/LogonPoint/receiver/images/common/icon_vpn.ico); it decides using dsl matchers. Severity in the template: critical. Marked as not yet verified against a live vulnerable target.

Run it against a host you own or are authorised to test:

bash
nuclei -u https://your-host -t CVE-2025-7775.yaml
Show the template (47 lines)
yaml
id: CVE-2025-7775

info:
  name: "Citrix - Memory Corruption"
  author: vedas-arpsyndicate
  severity: critical
  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.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2025-7775&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=citrix&match=exact
  classification:
    cve-id: CVE-2025-7775
  metadata:
    verified: false
  tags: cve,cve2025,kev,citrix,netscaler,memory-corruption,rce,zero-day
http:
  - method: GET
    path:
      - "{{BaseURL}}/logon/LogonPoint/receiver/images/common/icon_vpn.ico"

    extractors:
      - type: kval
        name: date
        part: header
        kval:
          - last_modified
  
      - type: dsl
        name: last_modified_ts
        dsl:
          - to_unix_time(date, "Mon, 02 Jan 2006 15:04:05 MST")
        internal: true
    
    matchers-condition: and
    matchers:
      - type: dsl
        dsl:
          - status_code==200 && mmh3(body)=="1418494345"

      - type: dsl
        dsl:
          - compare_versions(last_modified_ts, "< 1756166400")

CVE-2025-7775.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2025-7775 Citrix - Memory Corruption. Add them to your Suricata rule set and reload.

Show the rules
suricata
alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2025-7775 Citrix - Memory Corruption"; flow:established,to_server; http.uri; content:"/logon/LogonPoint/receiver/images/common/icon_vpn.ico"; nocase; fast_pattern; classtype:web-application-attack; reference:cve,CVE-2025-7775; reference:url,https://www.exploit.observer/?keyword=CVE-2025-7775&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=citrix&match=exact; sid:1011800; rev:1;)

CVE-2025-7775.rules on GitHub

Advisories on this CVE

References

Government sources

Other references

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.