CVE-2023-4966, widely referred to as Citrix Bleed, is a sensitive information disclosure vulnerability affecting Citrix NetScaler ADC and NetScaler Gateway appliances configured as Gateway or AAA virtual servers. This high-severity flaw allows unauthenticated remote attackers to exploit buffer errors via a low-complexity network attack, enabling the leakage of session tokens and subsequent session hijacking without user interaction. The vulnerability presents a critical risk as it is actively exploited in the wild by ransomware groups, is listed in the CISA KEV catalog, and has public exploit code available in common penetration testing frameworks like Metasploit and Nuclei.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 12.1, < 12.1-55.300CPE matchmatch criteria | cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:* | ||
>= 12.1, < 12.1-55.300CPE matchmatch criteria | cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:* | ||
>= 13.0, < 13.0-92.19CPE matchmatch criteria | cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:* | ||
>= 13.1, < 13.1-37.164CPE matchmatch criteria | cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:* | ||
>= 13.1, < 13.1-49.15CPE matchmatch criteria | cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.