CVE-2023-4966 (GCVE-0-2023-4966)
Vulnerability from cvelistv5 – Published: 2023-10-10 13:12 – Updated: 2026-07-31 03:55Title
Unauthenticated sensitive information disclosure
Summary
Sensitive information disclosure in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.
Severity
9.4 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2023-10-10 00:00 UTC
CWE
- CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Assigner
References
3 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Citrix | NetScaler ADC |
Affected:
14.1 , < 8.50
(patch)
Affected: 13.1 , < 49.15 (patch) Affected: 13.0 , < 92.19 (patch) Affected: 13.1-FIPS , < 37.164 (patch) Affected: 12.1-FIPS , < 55.300 (patch) Affected: 12.1-NDcPP , < 55.300 (patch) |
|
| Citrix | NetScaler Gateway |
Affected:
14.1 , < 8.50
(patch)
Affected: 13.1 , < 49.15 (patch) Affected: 13.0 , < 92.19 (patch) |
Date Public
2023-10-10 12:33
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 0f612580-1490-498a-82ef-0c65cd4f5344
Exploited: Yes
Timestamps
First Seen: 2023-10-18
Asserted: 2023-10-18
Scope
Notes: Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability | Affected: Citrix / NetScaler ADC and NetScaler Gateway | Description: Citrix NetScaler ADC and NetScaler Gateway contain a buffer overflow vulnerability that allows for sensitive information disclosure when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server. | Required action: Apply mitigations and kill all active and persistent sessions per vendor instructions [https://www.netscaler.com/blog/news/cve-2023-4966-critical-security-update-now-available-for-netscaler-adc-and-netscaler-gateway/] OR discontinue use of the product if mitigations are unavailable. | Due date: 2023-11-08 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://www.netscaler.com/blog/news/cve-2023-4966-critical-security-update-now-available-for-netscaler-adc-and-netscaler-gateway/, https://support.citrix.com/article/CTX579459/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20234966-and-cve20234967 ; https://nvd.nist.gov/vuln/detail/CVE-2023-4966
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 | 2023-11-08 |
| Date Added | 2023-10-18 |
| Vendorproject | Citrix |
| Vulnerabilityname | Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow 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: 99fbd586-08ed-4e48-bb76-ce7cd94f9230
Exploited: Yes
Timestamps
First Seen: 2023-10-18
Asserted: 2023-10-18
Scope
Notes: Unauthenticated sensitive information disclosure | Affected: Citrix / NetScaler ADC, NetScaler Gateway | CVSS: 9.4 (CRITICAL) | EPSS: 0.99999 | Used in malware: yes | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Confirmed Compromise
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | Unauthenticated sensitive information disclosure |
| Cve Id | CVE-2023-4966 |
| Vendor | Citrix |
| Ghsa Id | GHSA-2G42-2PWG-93CJ |
| Product | NetScaler ADC, NetScaler Gateway |
| Added Date | 2023-10-18T00:00:00.000Z |
| Cvss Score | 9.4 |
| Epss Score | 0.99999 |
| Previous Ids | |
| Cvss Severity | CRITICAL |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.99997 |
| Used In Malware | yes |
| Vulnerability Id | CVE-2023-4966 |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-10-02 09:11 CEST
| Updated: 2026-10-02 09:11 CEST
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"lessThan": "92.19",
"status": "affected",
"version": "13.0",
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},
{
"lessThan": "37.164",
"status": "affected",
"version": "13.1-FIPS",
"versionType": "patch"
},
{
"lessThan": "55.300",
"status": "affected",
"version": "12.1-FIPS",
"versionType": "patch"
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"status": "affected",
"version": "12.1-NDcPP",
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"datePublic": "2023-10-10T12:33:00.000Z",
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"providerMetadata": {
"dateUpdated": "2023-10-25T15:06:16.721Z",
"orgId": "e437aed5-38e0-4fa3-a98b-cb73e7acaec6",
"shortName": "Citrix"
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"references": [
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"datePublished": "2023-10-10T13:12:17.644Z",
"dateReserved": "2023-09-14T15:51:21.569Z",
"dateUpdated": "2026-07-31T03:55:28.627Z",
"state": "PUBLISHED"
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"dataType": "CVE_RECORD",
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}
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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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