CVE-2025-5777 (GCVE-0-2025-5777)
Vulnerability from cvelistv5 – Published: 2025-06-17 12:29 – Updated: 2026-08-04 03:55Title
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
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-06-17 00:00 UTC
Assigner
References
10 references
Impacted products
Date Public
2025-06-17 12:25
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: eef4e2be-2a1f-4155-9612-92aab6305371
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: 2026-10-02 08:09 CEST
| Updated: 2026-10-02 08:09 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 2390caa7-a97c-442f-8f71-e62f89be6478
Exploited: Yes
Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: NetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overread | Affected: NetScaler / ADC, Gateway | CVSS: 9.3 (CRITICAL) | EPSS: 0.99972 | Used in malware: yes | Listed 1 day ahead of CISA KEV | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Confirmed Compromise
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | NetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overread |
| Cve Id | CVE-2025-5777 |
| Vendor | NetScaler |
| Ghsa Id | None |
| Product | ADC, Gateway |
| Added Date | 2026-06-01T00:00:00.000Z |
| Cvss Score | 9.3 |
| Epss Score | 0.99972 |
| Previous Ids | |
| Cvss Severity | CRITICAL |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.99978 |
| Used In Malware | yes |
| Vulnerability Id | CVE-2025-5777 |
| Ahead Of Cisa Kev |
|
| Not Yet In Cisa Kev | False |
References
Created: 2026-10-02 09:10 CEST
| Updated: 2026-10-02 09:10 CEST
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"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-07-17T03:55:31.757062Z",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2025-07-10",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-5777"
},
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}
}
],
"problemTypes": [
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"descriptions": [
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"cweId": "CWE-457",
"description": "CWE-457 Use of Uninitialized Variable",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-06-17T13:57:47.854Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"url": "https://doublepulsar.com/citrixbleed-2-exploitation-started-mid-june-how-to-spot-it-f3106392aa71"
},
{
"tags": [
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"url": "https://reliaquest.com/blog/threat-spotlight-citrix-bleed-2-vulnerability-in-netscaler-adc-gateway-devices/"
},
{
"tags": [
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"timeline": [
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"time": "2025-07-10T00:00:00.000Z",
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"references": [
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"url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420"
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],
"source": {
"discovery": "UNKNOWN"
},
"title": "NetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overread",
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},
"cveMetadata": {
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"assignerShortName": "Citrix",
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"datePublished": "2025-06-17T12:29:34.506Z",
"dateReserved": "2025-06-06T06:14:02.358Z",
"dateUpdated": "2026-08-04T03:55:49.987Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.
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