---
title: "CVE-2023-6549: Cloud Software Group NetScaler ADC… | CubePath"
description: "Improper Restriction of Operations within the Bounds of a Memory Buffer in NetScaler ADC and NetScaler Gateway allows Unauthenticated Denial of Service…"
language: en
source: https://cubepath.com/security/cve/CVE-2023-6549
---

# CVE-2023-6549: Cloud Software Group NetScaler ADC… | CubePath

## Description

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

Official description from the CVE record, published by Citrix. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2023-6549)

## Key data

### CVSS 3.1 High 8.2

Score published by Citrix in the CVE record.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

| Metric                 | Value     | What it means                                                                       |
| ---------------------- | --------- | ----------------------------------------------------------------------------------- |
| Attack vector          | Network   | The vulnerable component can be reached over a network, possibly from the Internet. |
| Attack complexity      | Low       | No special conditions are needed. The attack can be repeated at will.               |
| Privileges required    | None      | No account or privileges are needed.                                                |
| User interaction       | None      | No action from any user is needed.                                                  |
| Scope                  | Unchanged | The impact stays within the vulnerable component.                                   |
| Confidentiality impact | None      | No effect on the secrecy of data.                                                   |
| Integrity impact       | Low       | Limited effect on the trustworthiness of data.                                      |
| Availability impact    | High      | Serious or total effect on availability.                                            |

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) .

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.57633 (57.6% probability)

Percentile

99.1%

Scores of

Nov 10, 2026

Model

v2026.06.15

### CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.

Name in the catalog

Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

Added to the catalog

Jan 17, 2024

Federal due date

Feb 7, 2024

### CISA assessment as of Jan 31, 2024

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Exploitation

Recorded by CISA as active

Automatable

yes

Technical impact

partial

### Weakness (CWE)

CWE catalog version 5.0.

CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license.

- [CWE-119](https://cwe.mitre.org/data/definitions/119.html) Improper Restriction of Operations within the Bounds of a Memory Buffer

## Affected products

Products listed in the CVE record, as the CNA published them.

- Cloud Software Group NetScaler ADC

  - affected: 14.1 up to before 12.35
  - affected: 13.1 up to before 51.15
  - affected: 13.0 up to before 92.21
  - affected: 13.1-FIPS up to before 37.176
  - affected: 12.1-FIPS up to before 55.302
  - affected: 12.1-NDcPP up to before 55.302

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [support.citrix.com/article/CTX584986/netscaler-adc-and-nets…](https://support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549)

## Timeline

1. ID reserved Dec 6, 2023
2. Added to CISA KEV Jan 17, 2024
3. Record published Jan 17, 2024
4. Record last updated Oct 21, 2025

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:24 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)