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CVE-2025-6543

Memory overflow vulnerability leading to unintended control flow and Denial of Service

CVSS 4.0 Critical 9.2Known exploited (CISA KEV)

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

Description

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

Official description from the CVE record, published by Citrix. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org

Key data

CVSS 4.0 Critical 9.2

Score published by Citrix in the CVE record.

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

  • Attack vector: Network

    The vulnerable component can be reached over a network, possibly from the Internet.

  • Attack complexity: High

    The attacker has to evade or get around security controls that are in place, which takes target-specific work.

  • Attack requirements: Present

    The attack depends on certain deployment or execution conditions being present.

  • Privileges required: None

    No account or privileges are needed.

  • User interaction: None

    No action from any user is needed.

  • Vulnerable system: confidentiality: High

    Serious or total effect on the secrecy of data.

  • Vulnerable system: integrity: High

    Serious or total effect on the trustworthiness of data.

  • Vulnerable system: availability: High

    Serious or total effect on availability.

  • Subsequent systems: confidentiality: Low

    Limited effect on other systems' data secrecy.

  • Subsequent systems: integrity: Low

    Limited effect on other systems' data trustworthiness.

  • Subsequent systems: availability: Low

    Limited effect on other systems' availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
Score
0.10433 (10.4% probability)
Percentile
95.8%
Scores of
Nov 10, 2026
Model
v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.
Name in the catalog
Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability
Added to the catalog
Jun 30, 2025
Federal due date
Jul 21, 2025

CISA assessment as of Jul 17, 2025

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.
Exploitation
Recorded by CISA as active
Automatable
no
Technical impact
total

Weakness (CWE)

CWE catalog version 5.0.
CWE names: Copyright © 2006-2026, The MITRE Corporation. See /security/cve/legal for the CWE license.
  • CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer

Affected products

Products listed in the CVE record, as the CNA published them.

  • NetScaler ADC

    • affected: 14.1 up to before 47.46
    • affected: 13.1 up to before 59.19
    • affected: 13.1 FIPS and NDcPP up to before 37.236

  • NetScaler Gateway

    • affected: 14.1 up to before 47.46
    • affected: 13.1 up to before 59.19
    • affected: 13.1 FIPS and NDcPP up to before 37.236

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Timeline

  1. ID reserved
  2. Record published
  3. Added to CISA KEV
  4. Record last updated

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About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.
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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:50 UTC. Sources and licenses