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

Vulnerability from cvelistv5 – Published: 2024-01-17 20:15 – Updated: 2025-10-21 23:05
VLAI CISA Shadowserver 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
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
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)
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: d595072d-6fb9-4e11-97ad-04551c755f01

Vulnerability ID: CVE-2023-6549

Status: Confirmed

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

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: 2026-02-02 13:24 UTC | Updated: 2026-11-04 13:02 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 26af0ca5-9e49-42f2-ae3d-9c4cf36807d3

Vulnerability ID: CVE-2023-6549

Status: Confirmed

Status Updated: 2025-07-29 00:00 UTC

Exploited: Yes

Characteristics
Severity: 75.0
Timestamps
First Seen: 2025-07-02
Asserted: 2025-07-02
Last Seen: 2025-07-29
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Citrix / Citrix NetScaler ADC and NetScaler Gateway | Class: app-delivery-controller | Severity: High (CVSS 7.5) | IoT: no | In CISA KEV: yes | Honeypot connections on 2025-07-29: 289
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class app-delivery-controller
7D Avg 0
Vendor Citrix
30D Avg 1
90D Avg 0
Product Citrix NetScaler ADC and NetScaler Gateway
Cisa Kev yes
Connections 289
Observation Date 2025-07-29
Vulnerability Class CVSS
Vulnerability Score 7.5
Vulnerability Severity High
References
Created: 2026-07-01 07:18 UTC | Updated: 2026-07-01 12:45 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: be7730db-96b2-4761-8ed7-01b014129104

Vulnerability ID: CVE-2023-6549

Status: Confirmed

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

Exploited: Yes

Timestamps
First Seen: 2024-01-17
Asserted: 2024-01-17
Scope
Notes: KEVIntel entry: 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) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Improper Restriction of Operations within the Bounds of a Memory Buffer in NetScaler ADC and NetScaler Gateway allows Unauthenticated Denial of...
Vendor Cloud Software Group
Product NetScaler ADC
Added Date 2024-01-17T00:00:00.000Z
Cvss Score 8.2
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 11:14 UTC | Updated: 2026-06-23 11:14 UTC
Show details on NVD website
To clipboard 

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}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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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.