CVE-2023-6549Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

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

8.2 HIGHEPSS 57.63%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-17 06:50 UTC

OverviewCVSS details

8.2HIGHCVSS 3.1

Score source: Citrix (CNA)
NVD status: Analyzed
Published: Jan 17, 2024
Assigner: Citrix

Affected

NetScaler ADC (Cloud Software Group)

Versions: 14.1 before 12.35 · 13.1 before 51.15
Fixed in: 12.35, 51.15, 92.21

All affected versions →

Exploitation

Public exploit: None listed
CISA KEV: Listed · Jan 17, 2024
KEV due date: Feb 7, 2024
Ransomware use: Unknown
SSVC: Exploitation active · Automatable yes · Impact partial

EPSS · FIRST, scored Nov 8

57.63%chance of exploitation in 30 days

Higher than 99.08% of CVEs

CVSS 3.1 · Citrix (CNA)

8.2High

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: Low
Availability impact: High

CVSS 3.1 · NVD

7.5High

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
8.2	HIGH	3.1Citrix (CNA)	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
7.5	HIGH	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA required action

⚡ Known exploited · remediation due Feb 7, 2024

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

Details

CVE ID: CVE-2023-6549
Status: Analyzed
Assigner (CNA): Citrix
Published: Jan 17, 2024
Last modified: 2026-06-17 06:50 UTC
Weaknesses: CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-09 14:13 UTC.