CVE-2026-88772 (GCVE-0-2026-88772)

Vulnerability from cvelistv5 – Published: 2026-09-27 16:09 – Updated: 2026-09-28 03:55
VLAI CISA CIRCL ENISA Previdian
Title
Memory overflow vulnerability leading to Remote Code Execution or Denial of Service
Summary
Vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to Remote Code Execution or Denial of Service
Severity
9.5 (Critical)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-27 00:00 UTC
CWE
  • CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Assigner
References
Impacted products
Vendor Product Version CPE status
Citrix NetScaler ADC Affected: 0 , < 14.1-73.37 (patch)
Affected: 0 , < 13.1-64.23 (patch)
Affected: 0 , < 14.1-73.37 FIPS (patch)
Affected: 0 , < 13.1.37.279 FIPS and NDcPP (patch)
guessed Create a notification for this product.
Citrix NetScaler Gateway Affected: 0 , < 14.1-73.37 (patch)
Affected: 0 , < 13.1-64.23 (patch)
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 25ce362a-a184-4ea6-83c7-64bb2a2242a3

Vulnerability ID: CVE-2026-88772

Status: Confirmed

Status Updated: 2026-09-27 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-27
Asserted: 2026-09-27
Scope
Notes: Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability | Affected: Citrix / NetScaler | Description: Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for remote code execution or denial of service | Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. | Due date: 2026-09-30 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): Running the provided IOCs in the NetScaler console may help identify indicators of exploitation. Customers must conduct forensic triage as directed by BOD 26‑04 and follow Citrix’s published guidance for mitigations. For more information, please see: https://community.citrix.com/techzone-blogs/110_security-updates/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve-2026-88771-through-cve-2026-88778 ; https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096 ; https://support.citrix.com/external/article/CTX694799/steps-to-take-if-netscaler-adc-is-suspec.html ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-88772
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-119
Feed CISA Known Exploited Vulnerabilities Catalog
Product NetScaler
Due Date 2026-09-30
Date Added 2026-09-27
Vendorproject Citrix
Vulnerabilityname Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-09-27 22:00 UTC | Updated: 2026-09-27 22:00 UTC
CIRCL
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: ad7ee50f-9ff2-40ee-8508-6cfe3f274745

Vulnerability ID: CVE-2026-88772

Status: Confirmed

Status Updated: 2026-09-28 10:37 UTC

Exploited: Yes

Characteristics
Remote Code Execution: Yes
Authentication Required: Yes
Local Access Required: Yes
Severity: 100.0
Timestamps
First Seen: 2026-09-28
Asserted: 2026-09-28
Last Seen: 2026-09-28
Created: 2026-09-28 10:37 UTC | Updated: 2026-09-28 10:37 UTC
ENISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: c6e5d3ee-94a3-487c-a2cd-d7dc4e78ca7e

Vulnerability ID: CVE-2026-88772

Status: Confirmed

Status Updated: 2026-09-27 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-27
Asserted: 2026-09-27
Scope
Notes: Affected: Citrix / NetScaler ADC, NetScaler Gateway | Description: Memory overflow vulnerability leading to Remote Code Execution or Denial of Service | Exploitation type: unknown | CWEs: CWE-119 | Origin source: CNW | Notes: https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096
Evidence

Type: Csirt Report

Signal: Successful Exploitation

Confidence: 75%

Source: enisa-cnw-kev

Details
Cwes CWE-119
Euvd EUVD-2026-56431
Notes https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096
Catalog ENISA / EU CSIRTs Network (CNW) KEV JSON
Product NetScaler ADC, NetScaler Gateway
Datereported 2026/09/27
Originsource CNW
Patchedsince
Vendorproject Citrix
Exploitationtype unknown
Vulnerabilityname
Threatactorsexploiting
References
Created: 2026-09-28 10:00 UTC | Updated: 2026-09-28 10:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: fb84583a-1292-444b-a5af-e431e11e44e6

Vulnerability ID: CVE-2026-88772

Status: Confirmed

Status Updated: 2026-09-27 16:45 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-27
Asserted: 2026-09-27
Scope
Notes: Memory overflow vulnerability leading to Remote Code Execution or Denial of Service | Affected: Citrix NetScaler / ADC, Gateway | CVSS: 9.5 (CRITICAL) | Used in malware: unknown | Listed 5 hours 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 Remote Code Execution or Denial of Service
Cve Id CVE-2026-88772
Vendor Citrix NetScaler
Ghsa Id GHSA-H5XM-PF48-4C32
Product ADC, Gateway
Added Date 2026-09-27T16:45:00.000Z
Cvss Score 9.5
Epss Score None
Previous Ids
Cvss Severity CRITICAL
Virtual Patch False
Cvss Estimated False
Epss Percentile None
Used In Malware unknown
Vulnerability Id CVE-2026-88772
Ahead Of Cisa Kev 
{
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}
Not Yet In Cisa Kev False
References
Created: 2026-09-28 17:00 UTC | Updated: 2026-09-28 17:00 UTC
Show details on NVD website
To clipboard 

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}



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Tags
Taxonomy of the tags.





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.