CVE-2026-3055 (GCVE-0-2026-3055)

Vulnerability from cvelistv5 – Published: 2026-03-23 20:21 – Updated: 2026-03-31 03:55
VLAI CISA Shadowserver Previdian
Title
Insufficient input validation leading to memory overread
Summary
Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-23 00:00 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
NetScaler ADC Affected: 14.1 , < 66.59 (patch)
Affected: 13.1 , < 62.23 (patch)
Affected: 13.1 FIPS and NDcPP , < 37.262 (patch)
guessed Create a notification for this product.
NetScaler Gateway Affected: 14.1 , < 66.59 (patch)
Affected: 13.1 , < 62.23 (patch)
guessed Create a notification for this product.
Date Public
2026-03-23 19:20
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 3f9c5779-ead6-41cc-a01a-1ba8c5c8671f

Vulnerability ID: CVE-2026-3055

Status: Confirmed

Status Updated: 2026-03-30 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-03-30
Asserted: 2026-03-30
Scope
Notes: KEV entry: Citrix NetScaler Out-of-Bounds Read Vulnerability | Affected: Citrix / NetScaler | Description: Citrix NetScaler ADC (formerly Citrix ADC), NetScaler Gateway (formerly Citrix Gateway) and NetScaler ADC FIPS and NDcPP contain an out-of-bounds reads vulnerability when configured as a SAML IDP leading to memory overread. | 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: 2026-04-02 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300&articleURL=NetScaler_ADC_and_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_3055_and_CVE_2026_4368 ; https://nvd.nist.gov/vuln/detail/CVE-2026-3055
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-125
Feed CISA Known Exploited Vulnerabilities Catalog
Product NetScaler
Due Date 2026-04-02
Date Added 2026-03-30
Vendorproject Citrix
Vulnerabilityname Citrix NetScaler Out-of-Bounds Read Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-03-30 20:00 UTC | Updated: 2026-03-30 20:00 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: ffd585cc-2e1d-4806-8fc5-72d77f5b945d

Vulnerability ID: CVE-2026-3055

Status: Confirmed

Status Updated: 2026-07-20 00:00 UTC

Exploited: Yes

Characteristics
Severity: 93.0
Timestamps
First Seen: 2026-03-31
Asserted: 2026-03-31
Last Seen: 2026-07-20
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Citrix / Citrix NetScaler ADC and NetScaler Gateway | Class: app-delivery-controller | Severity: Critical (CVSS 9.3) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-07-20: 209
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 34
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class app-delivery-controller
7D Avg 7
Vendor Citrix
30D Avg 15
90D Avg 29
Product Citrix NetScaler ADC and NetScaler Gateway
Cisa Kev yes
Connections 209
Observation Date 2026-07-20
Vulnerability Class CVSS
Vulnerability Score 9.3
Vulnerability Severity Critical
References
Created: 2026-06-30 09:22 UTC | Updated: 2026-07-22 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: ebd9a623-549e-4048-b573-b023a5829524

Vulnerability ID: CVE-2026-3055

Status: Confirmed

Status Updated: 2026-06-01 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: Insufficient input validation leading to memory overread | Affected: NetScaler / ADC, Gateway | CVSS: 9.3 (CRITICAL) | EPSS: 0.83996 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Insufficient input validation leading to memory overread
Vendor NetScaler
Product ADC, Gateway
Added Date 2026-06-01T00:00:00.000Z
Cvss Score 9.3
Epss Score 0.83996
Cvss Severity CRITICAL
Epss Percentile 0.9966
Used In Malware unknown
Ahead Of Cisa Kev 
{
  "count": 1,
  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:03 UTC | Updated: 2026-07-10 06:14 UTC
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.


Detection rules are retrieved from Rulezet.


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.