CVE-2025-6543

criticalpriority · act · 90OT risk · criticalKEV · exploitedEU KEV · CNWEPSS 0.106 · 96 %ileexploit · PoCDEEUNLRUUS
grimoire priorityP0 · Act now
Exploitable?
Yes · in the wild
CISA KEV · 3 exploits · PoC
Likely / severe?
10.6% (96th) EPSS
CVSS 9.8 · critical
Is it mine?
29 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · fstec_bdu · cert_bund

added 2025-06-30remediate by 2025-07-21

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.

EU KEVflagged by CNWreported 2025-07-18patched 2025-06-25

Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.

EPSS · scored 2026-10-24

Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability

Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server

01

cvss

Technical severity, 0–10. One row per scoring source.

9.8
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.1–9.8

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9
v3.18.1highAV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU
v4.09.2criticalCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:Lsecondary · ENISA EU
v4.09.2criticalCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · secure@citrix.com
v4.09.2criticalCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:A/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-119USCWE-119USCWE-119US
04

ATT&CK techniques

ATT&CK techniques this enables or maps to.

05

exploits (3)

Public proof-of-concept and weaponised exploit code.

06

affected products (29)

Products and version ranges known to be affected.

showing 20 of 29
07

advisories (2)

Vendor and ecosystem advisories describing this.

  • NCSC-2025-0203Kwetsbaarheid verholpen in Citrix NetScaler ADC en NetScaler GatewayNL2025-06-25csaf · ncsc_nlNL

    Citrix heeft een kwetsbaarheid verholpen in NetScaler ADC en NetScaler Gateway. Om kwetsbaar te zijn moet NetScaler worden geconfigureerd als Gateway (VPN-virtuele server, ICA Proxy, CVPN, RDP Proxy) of AAA virtual server. Let op, dit is vaak default config.

  • WID-SEC-W-2025-1403Citrix Systems NetScaler: Schwachstelle ermöglicht Denial of ServiceDeutsch2025-06-25csaf · cert_bundDE

    Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Citrix Systems NetScaler ausnutzen, um einen Denial of Service Angriff durchzuführen.

08

also known as (4)

Other names and identifiers for this entity.

09

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducert_bundncsc_nlNVDCVE.orgMITRE
published 2025-06-25modified 2026-06-17
10

references (5)

External citations — patches, advisories, analysis.

scry

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