CVE-2023-6549 (GCVE-0-2023-6549)

Vulnerability from cvelistv5 – Published: 2024-01-17 20:15 – Updated: 2025-10-21 23:05
VLAI CISA Previdian
Summary
Improper Restriction of Operations within the Bounds of a Memory Buffer in NetScaler ADC and NetScaler Gateway allows Unauthenticated Denial of Service and Out-Of-Bounds Memory Read
Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
SSVC
Exploitation: active Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-01-31 05:00 UTC
CWE
  • CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Assigner
References
Impacted products
Vendor Product Version
Cloud Software Group NetScaler ADC Affected: 14.1 , < 12.35 (patch)
Affected: 13.1 , < 51.15 (patch)
Affected: 13.0 , < 92.21 (patch)
Affected: 13.1-FIPS , < 37.176 (patch)
Affected: 12.1-FIPS , < 55.302 (patch)
Affected: 12.1-NDcPP , < 55.302 (patch)
Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 69144c74-5b01-4252-8fe3-c4acb453f442

Vulnerability ID: CVE-2023-6549

Status: Confirmed

Status Updated: 2024-01-17 01:00 CET

Exploited: Yes

Timestamps
First Seen: 2024-01-17
Asserted: 2024-01-17
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 a denial-of-service when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server. | Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. | Due date: 2024-02-07 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549; https://nvd.nist.gov/vuln/detail/CVE-2023-6549
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 2024-02-07
Date Added 2024-01-17
Vendorproject Citrix
Vulnerabilityname Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability
Knownransomwarecampaignuse Unknown
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: 37550da8-e58f-4e91-abfa-89a185391f17

Vulnerability ID: CVE-2023-6549

Status: Confirmed

Status Updated: 2024-01-17 01:00 CET

Exploited: Yes

Timestamps
First Seen: 2024-01-17
Asserted: 2024-01-17
Scope
Notes: Improper Restriction of Operations within the Bounds of a Memory Buffer in NetScaler ADC and NetScaler Gateway allows Unauthenticated Denial of... | Affected: Cloud Software Group / NetScaler ADC | CVSS: 8.2 (HIGH) | EPSS: 0.57633 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title Improper Restriction of Operations within the Bounds of a Memory Buffer in NetScaler ADC and NetScaler Gateway allows Unauthenticated Denial of...
Cve Id CVE-2023-6549
Vendor Cloud Software Group
Ghsa Id None
Product NetScaler ADC
Added Date 2024-01-17T00:00:00.000Z
Cvss Score 8.2
Epss Score 0.57633
Previous Ids
Cvss Severity HIGH
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.99058
Used In Malware unknown
Vulnerability Id CVE-2023-6549
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
Show details on NVD website
To clipboard 

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                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.2,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
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                "userInteraction": "NONE",
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                  "description": "CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer",
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            "orgId": "e437aed5-38e0-4fa3-a98b-cb73e7acaec6",
            "shortName": "Citrix"
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          "references": [
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              "url": "https://support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549"
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        "assignerShortName": "Citrix",
        "cveId": "CVE-2023-6549",
        "datePublished": "2024-01-17T20:15:53.345Z",
        "dateReserved": "2023-12-06T11:01:58.256Z",
        "dateUpdated": "2025-10-21T19:45:16.531Z",
        "state": "PUBLISHED"
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      "dataType": "CVE_RECORD",
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}



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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

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.



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.