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CVE-2025-5777 (GCVE-0-2025-5777)

Vulnerability from cvelistv5 – Published: 2025-06-17 12:29 – Updated: 2026-08-04 03:55
VLAI CISA Shadowserver Previdian
Title
NetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overread
Summary
Insufficient input validation leading to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server
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 2025-06-17 00:00 UTC
CWE
  • CWE-125 - Out-of-bounds Read
  • CWE-457 - Use of Uninitialized Variable
Assigner
References
Impacted products
Vendor Product Version CPE status
NetScaler ADC Affected: 14.1 , < 43.56 (patch)
Affected: 13.1 , < 58.32 (patch)
guessed Create a notification for this product.
NetScaler Gateway Affected: 14.1 , < 43.56 (patch)
Affected: 13.1 , < 58.32 (patch)
guessed Create a notification for this product.
Date Public
2025-06-17 12:25
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: e57d503c-0dfe-4374-a66d-3fdc00d54a0d

Vulnerability ID: CVE-2025-5777

Status: Confirmed

Status Updated: 2025-07-10 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2025-07-10
Asserted: 2025-07-10
Scope
Notes: KEV entry: Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability | Affected: Citrix / NetScaler ADC and Gateway | Description: Citrix NetScaler ADC and Gateway contain an out-of-bounds read vulnerability due to insufficient input validation. This vulnerability can lead to memory overread when the NetScaler is configured as a 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: 2025-07-11 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420 ; https://nvd.nist.gov/vuln/detail/CVE-2025-5777
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-125
Feed CISA Known Exploited Vulnerabilities Catalog
Product NetScaler ADC and Gateway
Due Date 2025-07-11
Date Added 2025-07-10
Vendorproject Citrix
Vulnerabilityname Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability
Knownransomwarecampaignuse Known
References
Created: 2026-02-02 13:24 UTC | Updated: 2026-02-06 07:53 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: b0d43b83-922a-46e1-a627-904d3a7786df

Vulnerability ID: CVE-2025-5777

Status: Confirmed

Status Updated: 2026-09-07 00:00 UTC

Exploited: Yes

Characteristics
Severity: 0.0
Timestamps
First Seen: 2025-07-02
Asserted: 2025-07-02
Last Seen: 2026-09-07
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Citrix / Citrix NetScaler | Class: app-delivery-controller | Severity: None (CVSS 0) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-09-07: 3599
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 77
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class app-delivery-controller
7D Avg 77
Vendor Citrix
30D Avg 66
90D Avg 52
Product Citrix NetScaler
Cisa Kev yes
Connections 3599
Observation Date 2026-09-07
Vulnerability Class CVSS
Vulnerability Score 0
Vulnerability Severity None
References
Created: 2026-07-01 05:53 UTC | Updated: 2026-09-09 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: a4832f96-d731-40a5-85e5-a7dea353ad9c

Vulnerability ID: CVE-2025-5777

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: NetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overread | Affected: NetScaler / ADC, Gateway | CVSS: 9.3 (CRITICAL) | EPSS: 0.99897 | Used in malware: yes | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Confirmed Compromise

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title NetScaler ADC and NetScaler Gateway - 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 0.99897
Cvss Severity CRITICAL
Epss Percentile 0.99963
Used In Malware yes
Ahead Of Cisa Kev 
{
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  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-06-19 12:42 UTC | Updated: 2026-06-19 12:42 UTC
Show details on NVD website
To clipboard 

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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.


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.