Threat Intelligence / CVE / CVE-2023-4967

CVE-2023-4967 — Cloud Software Group NetScaler ADC

CVSS v3.1 8.2 (HIGH) · EPSS 0.8% (higher than 55.5% of all scored CVEs) · Priority 8.3/10 · Published 2023-10-27

As of 2025-02-27, CVE-2023-4967 is a HIGH-severity vulnerability in Cloud Software Group NetScaler ADC, CVSS v3.1 8.2, EPSS 0.8% (55.5th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2023-4967, most recently “Proofpoint AI Era Ransomware Report: 37% of Paying Victims Face Repeat Extortion Demands”.

Last updated: 2025-02-27

What is CVE-2023-4967?

Denial of Service in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA Virtual Server

The record classifies CVE-2023-4967 under weakness class CWE-119. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 1051 days ago.

Severity and exploitation probability

CVSS v3.1 base score
8.2 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
EPSS (FIRST)
0.8% probability of exploitation in the next 30 days, higher than 55.5% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
8.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2023-10-27, last modified 2025-02-27

Is CVE-2023-4967 being exploited?

Weaponised exploit code for CVE-2023-4967 is publicly available. 1 public proof-of-concept repository is tracked for this identifier.

Affected products and versions

How to fix CVE-2023-4967

Vendor advisory: https://support.citrix.com/article/CTX579459/. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2023-4967

1 tracked threat in the Threadlinqs corpus references CVE-2023-4967, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Other references

Full detection coverage & IOCs for threats exploiting CVE-2023-4967 are available via the Threadlinqs MCP server (Purple tier). View plans →

← all vulnerabilities · Markdown version · Threadlinqs Intelligence