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

Vulnerability from cvelistv5 – Published: 2025-06-17 12:29 – Updated: 2026-10-07 17:58
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 2026-08-04 03:55 UTC
CWE
Assigner
Citrix CNA under the mitre root
CNA scorecard C 66/100 over 10 records in the last 180 days details
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: 9f935a4b-aaa2-490b-9e54-b9a81c09f121

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: 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 12:25 UTC | Updated: 2026-11-04 13:37 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 1a3487c4-6f8a-4e49-963b-a371cf76b7db

Vulnerability ID: CVE-2025-5777

Status: Confirmed

Status Updated: 2026-11-12 00:00 UTC

Exploited: Yes

Characteristics
Severity: 0.0
Timestamps
First Seen: 2025-07-02
Asserted: 2025-07-02
Last Seen: 2026-11-12
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 2026-11-12: 4699
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 102
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class app-delivery-controller
7D Avg 87
Vendor Citrix
30D Avg 83
90D Avg 82
Product Citrix NetScaler
Cisa Kev yes
Connections 4699
Observation Date 2026-11-12
Vulnerability Class CVSS
Vulnerability Score 0
Vulnerability Severity None
References
Created: 2026-06-30 09:22 UTC | Updated: 2026-11-14 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 0bc3e2da-53de-48d5-a367-4a6489b8b2ca

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: 0.99896 | 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 0.99896
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: 2026-06-23 14:03 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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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

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • 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.
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Vulnerability timeline

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