Is CVE-2023-6549 actively exploited?

Yes. CVE-2023-6549 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2023-6549 be exploited remotely?

The attack vector of CVE-2023-6549 has not been classified yet.

What is the CVSS score of CVE-2023-6549?

CVE-2023-6549 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2023-6549

HIGHCISA KEVIN THE WILD

CVE-2023-6549

Published: January 17, 2024

EPSS:78.61%probability of exploitation in 30 daysPercentile:99.0th

Official 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.

NVD Source

CISA KEV Advisory

Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

Added to KEV: 2024-01-17Federal patch deadline: 2024-02-07

Required Action (CISA)

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

Risk Analysis

Citrix NetScaler ADC and NetScaler Gateway are susceptible to a buffer overflow vulnerability that can lead to a denial-of-service condition. This occurs when the devices are configured as a Gateway or AAA virtual server. The high EPSS score of 0.78605 indicates a high likelihood of exploitation, and its inclusion in CISA's KEV confirms active exploitation.

This vulnerability is actively exploited in the wild, as confirmed by its presence in CISA's KEV. It is remotely exploitable.

Recommended Action

Apply the latest security patches and updates for Citrix NetScaler ADC and NetScaler Gateway. Monitor device performance and logs for signs of denial-of-service attacks.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2023-6549 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2023-6549 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.