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CVE-2023-6549

HIGH
Published 2024-01-17T20:15:53.345Z
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CVSS Score

V3.1
8.2
/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.147
probability
of exploitation in the wild

There is a 14.7% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.941
Higher than 94.1% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
LOW
Availability
HIGH

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

Understanding This Vulnerability

This Common Vulnerabilities and Exposures (CVE) entry provides detailed information about a security vulnerability that has been publicly disclosed. CVEs are standardized identifiers assigned by MITRE Corporation to track and catalog security vulnerabilities across software and hardware products.

The severity rating (HIGH) indicates the potential impact of this vulnerability based on the CVSS (Common Vulnerability Scoring System) framework. Higher severity ratings typically indicate vulnerabilities that could lead to more significant security breaches if exploited. Security teams should prioritize remediation efforts based on severity, exploit availability, and the EPSS (Exploit Prediction Scoring System) score, which predicts the likelihood of exploitation in the wild.

If this vulnerability affects products or systems in your infrastructure, we recommend reviewing the affected products section, checking for available patches or updates from vendors, and implementing recommended workarounds or solutions until a permanent fix is available. Organizations should also monitor security advisories and threat intelligence feeds for updates about active exploitation of this vulnerability.

Available Exploits

Citrix Netscaler ADC & Gateway - Out-Of-Bounds Memory Read

The vulnerability would enable an attacker to remotely obtain sensitive information from a NetScaler appliance configured as a Gateway or AAA virtual server via a very commonly connected Web interface, and without requiring authentication. This bug is nearly identical to the Citrix Bleed vulnerability (CVE-2023-4966), except it is less likely to return highly sensitive information to an attacker.

ID: CVE-2023-6549
Author: ice3man Critical

Related News

No news articles found for this CVE.

Affected Products

References

Known Exploited Vulnerability

This vulnerability is actively being exploited in the wild

View KEV Details

Remediation Status

Overdue

Due Date

February 7, 2024

Added to KEV

January 17, 2024

Required Action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Affected Product

Vendor/Project: Citrix
Product: NetScaler ADC and NetScaler Gateway

Ransomware Risk

Known Ransomware Use
KEV Catalog Version: 2025.01.24 Released: January 24, 2025

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed HIGH

GHSA-8fxh-p33g-qf5m

Advisory Details

Denial of Service

CVSS Scoring

CVSS Score

7.5

CVSS Vector

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

Advisory provided by GitHub Security Advisory Database. Published: January 17, 2024, Modified: October 22, 2025

References

Published: 2024-01-17T20:15:53.345Z
Last Modified: 2025-07-28T19:43:33.417Z
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