CVE-2026-8452 (GCVE-0-2026-8452)
Vulnerability from cvelistv5 – Published: 2026-06-30 12:41 – Updated: 2026-08-27 03:56Title
Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service
Summary
Memory overflow vulnerability NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server
Severity
SSVC
Exploitation: active
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 00:00 UTC
CWE
- CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://support.citrix.com/support-home/kbsearch/… | |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| NetScaler | ADC |
Affected:
14.1 , < 72.61
(patch)
Affected: 13.1 , < 63.18 (patch) Affected: 14.1 FIPS , < 72.61 (patch) Affected: 13.1 FIPS and NDcPP , < 37.272 (patch) |
guessed | |
| NetScaler | Gateway |
Affected:
14.1 , < 72.61
(patch)
Affected: 13.1 , < 63.18 (patch) |
guessed |
Date Public
2026-06-30 12:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 0ced1346-1029-445e-9131-20f0b12ff2d6
Exploited: Yes
Timestamps
First Seen: 2026-08-26
Asserted: 2026-08-26
Scope
Notes: Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability | Affected: Citrix / NetScaler ADC and NetScaler Gateway | Description: Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability which could lead to 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: 2026-08-29 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696604 ; 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-2026-8452
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-119 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | NetScaler ADC and NetScaler Gateway |
| Due Date | 2026-08-29 |
| Date Added | 2026-08-26 |
| Vendorproject | Citrix |
| Vulnerabilityname | Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-08-26 18:00 UTC
| Updated: 2026-08-26 18:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 791ad154-46f6-4362-8f50-627c7f7b7cee
Exploited: Yes
Timestamps
First Seen: 2026-08-17
Asserted: 2026-08-17
Scope
Notes: Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service | Affected: NetScaler / ADC, Gateway | CVSS: 8.8 (HIGH) | EPSS: 0.00487 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service |
| Vendor | NetScaler |
| Product | ADC, Gateway |
| Added Date | 2026-08-17T08:04:34.863Z |
| Cvss Score | 8.8 |
| Epss Score | 0.00487 |
| Cvss Severity | HIGH |
| Epss Percentile | 0.39763 |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | True |
References
Created: 2026-08-17 09:00 UTC
| Updated: 2026-08-17 09:00 UTC
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"version": "14.1",
"versionType": "patch"
},
{
"lessThan": "63.18",
"status": "affected",
"version": "13.1",
"versionType": "patch"
}
]
}
],
"datePublic": "2026-06-30T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
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"base64": false,
"type": "text/html",
"value": "\u003cspan\u003eMemory overflow vulnerability\u0026nbsp;\u003c/span\u003e\u003cspan\u003eNetScaler ADC and NetScaler Gateway\u0026nbsp;\u003c/span\u003e\u003cspan\u003eleading to unpredictable or erroneous behavior and Denial of Service if the a\u003c/span\u003e\u003cspan\u003eppliance is configured as a\u0026nbsp;\u003c/span\u003e\u003cspan\u003eGateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or \u003c/span\u003e\u003cspan\u003eAAA virtual server\u003c/span\u003e\u003cbr\u003e"
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"value": "Memory overflow vulnerability\u00a0NetScaler ADC and NetScaler Gateway\u00a0leading to unpredictable or erroneous behavior and Denial of Service if the appliance is configured as a\u00a0Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server"
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "LOW",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "LOW",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:L/SI:L/SA:L",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-06-30T12:57:25.158Z",
"orgId": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5",
"shortName": "NetScaler"
},
"references": [
{
"url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696604"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service",
"x_generator": {
"engine": "Vulnogram 1.0.2"
}
}
},
"cveMetadata": {
"assignerOrgId": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5",
"assignerShortName": "NetScaler",
"cveId": "CVE-2026-8452",
"datePublished": "2026-06-30T12:41:07.622Z",
"dateReserved": "2026-05-13T00:35:55.317Z",
"dateUpdated": "2026-08-27T03:56:34.886Z",
"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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