CVE-2023-6549

critical

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

From the Tenable Blog

CVE-2023-6548, CVE-2023-6549: Zero-Day Vulnerabilities Exploited in Citrix NetScaler ADC and NetScaler Gateway

Published: 2024-01-16

Two zero-day vulnerabilities in Citrix NetScaler ADC and NetScaler Gateway have been exploited in the wild. Urgent patching is required to address these flaws.

References

https://www.bleepingcomputer.com/news/security/citrix-warns-of-new-netscaler-zero-days-exploited-in-attacks/

https://www.tenable.com/blog/verizon-2025-dbir-tenable-research-collaboration

https://www.tenable.com/blog/cve-2023-6548-cve-2023-6549-zero-day-vulnerabilities-netscaler-adc-gateway-exploited

https://support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549

Details

Source: Mitre, NVD

Published: 2024-01-17

Updated: 2025-01-27

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High

CVSS v4

Base Score: 9.2

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

Severity: Critical

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest

Detections

Analytics