CRITICALCVSS 9.8Actively exploited · CISA KEV since 2025-06-30Vulnerability

CVE-2025-6543

Citrix NetScaler ADC and Gateway contain a buffer overflow vulnerability leading to unintended control flow and Denial of Service. NetScaler must be configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.

Properties

Euvd product
ADC, Gateway
Vulnerability name
Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability
First seen
2026-02-26T17:50:24+00:00
Cvss score
9.8
Epss score
0.10562
Last seen
2026-10-19T12:00:27+00:00
Due date
2025-07-21
Euvd assigner
Citrix
Retrieved at
2026-10-21T01:24:48+00:00
Exploited euvd since
2025-06-30T00:00:00+00:00
Src batch id
epss_history-20261020T103617Z-728ddd
Source url
https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
Date added
2025-06-30
Score
9.8
Euvd base score version
4.0
Fetched at
2026-10-20T10:36:20+00:00
Euvd vendor
NetScaler
Cvss vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
In Signal since
initial import (Sep 2026)
Euvd base score
9.2

Related Entities (7)

AFFECTS_PRODUCT (4)

→[Product]cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*
→[Product]cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*
→[Product]cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*
→[Product]cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*

DESCRIBES (1)

←[KEVEntry]Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability

HAS_WEAKNESS (1)

→[Weakness]Improper Restriction of Operations within the Bounds of a Memory Buffer

INVOLVES (1)

←[Signal]kev_added · 2025-06-30

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CVE-2025-6543 (CVSS 9.8) — Ninja Signal Threat Intelligence | Ninja Signal