CVE-2025-6543 (GCVE-0-2025-6543)

Vulnerability from cvelistv5 – Published: 2025-06-25 12:49 – Updated: 2026-02-26 17:50
VLAI CISA ENISA Previdian
Title
Memory overflow vulnerability leading to unintended control flow and Denial of Service
Summary
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
Severity
9.2 (Critical)
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
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-07-17 03:55 UTC
CWE
  • CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Assigner
References
Impacted products
Vendor Product Version
NetScaler ADC Affected: 14.1 , < 47.46 (patch)
Affected: 13.1 , < 59.19 (patch)
Affected: 13.1 FIPS and NDcPP , < 37.236 (patch)
Create a notification for this product.
NetScaler Gateway Affected: 14.1 , < 47.46 (patch)
Affected: 13.1 , < 59.19 (patch)
Affected: 13.1 FIPS and NDcPP , < 37.236 (patch)
Create a notification for this product.
Date Public
2025-06-25 12:30
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 12ad176b-bdf5-4c53-b0de-c934717e61b9

Vulnerability ID: CVE-2025-6543

Status: Confirmed

Status Updated: 2025-06-30 02:00 CEST

Exploited: Yes

Timestamps
First Seen: 2025-06-30
Asserted: 2025-06-30
Scope
Notes: Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability | Affected: Citrix / NetScaler ADC and Gateway | Description: 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. | 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. | Due date: 2025-07-21 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788 ; https://www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/ ; https://nvd.nist.gov/vuln/detail/CVE-2025-6543
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-119
Feed CISA Known Exploited Vulnerabilities Catalog
Product NetScaler ADC and Gateway
Due Date 2025-07-21
Date Added 2025-06-30
Vendorproject Citrix
Vulnerabilityname Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-10-02 08:09 CEST | Updated: 2026-10-02 08:09 CEST
ENISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: ffa1e340-1807-47eb-8cd0-bbc3b5821992

Vulnerability ID: CVE-2025-6543

Status: Confirmed

Status Updated: 2025-07-18 02:00 CEST

Exploited: Yes

Timestamps
First Seen: 2025-07-18
Asserted: 2025-07-18
Scope
Notes: Affected: Citrix / NetScaler ADC and NetScaler Gateway | 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. | Patched since: 2025/06/25 | Exploitation type: unknown | Origin source: CNW
Evidence

Type: Csirt Report

Signal: Successful Exploitation

Confidence: 75%

Source: enisa-cnw-kev

Details
Cwes
Euvd EUVD-2025-19085
Notes
Catalog ENISA / EU CSIRTs Network (CNW) KEV JSON
Product NetScaler ADC and NetScaler Gateway
Datereported 2025/07/18
Originsource CNW
Patchedsince 2025/06/25
Vendorproject Citrix
Exploitationtype unknown
Vulnerabilityname
Threatactorsexploiting
References
Created: 2026-10-02 08:52 CEST | Updated: 2026-10-02 08:52 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 504b8f8e-a56a-4088-a79d-1ead815ce0a3

Vulnerability ID: CVE-2025-6543

Status: Confirmed

Status Updated: 2026-06-01 12:36 CEST

Exploited: Yes

Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: Memory overflow vulnerability leading to unintended control flow and Denial of Service | Affected: NetScaler / ADC, Gateway | CVSS: 9.2 (CRITICAL) | EPSS: 0.10562 | Used in malware: unknown | Listed 1 day ahead of CISA KEV | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title Memory overflow vulnerability leading to unintended control flow and Denial of Service
Cve Id CVE-2025-6543
Vendor NetScaler
Ghsa Id None
Product ADC, Gateway
Added Date 2026-06-01T10:36:14.774Z
Cvss Score 9.2
Epss Score 0.10562
Previous Ids
Cvss Severity CRITICAL
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.95648
Used In Malware unknown
Vulnerability Id CVE-2025-6543
Ahead Of Cisa Kev 
{
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  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-10-02 09:10 CEST | Updated: 2026-10-02 09:10 CEST
Show details on NVD website
To clipboard 

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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.