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cve recordhighexploited in the wild3 of 3 cataloguesransomwareexploit reported

CVE-2025-5777

Citrix · NetScaler ADC and Gateway · Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability

· Added to CISA KEV
CVSS—
Severityhigh
Weakness—
EPSS100.0%100.0th percentile
Exploited3 KEV sources
Ransomware useKnown
Federal fix dueJul 11, 2025
patch window

Called exploited 9 days after disclosure.

Measured from the CVE publication date to the earliest of 3 KEV catalogues that list it.

The life of this vulnerability

  1. CVE published
  2. First KEV listing9d
  3. Last KEV listing14d
  4. Last sighting1.2y

Gaps are compressed to equal steps. The elapsed time is printed under each.

Which catalogues call it exploited

Sources3 of 3
Listings differ by14 d
Strongest claimconfirmed

3 catalogues list it. CIRCL aggregates the others and is shown but not counted.

Public exploitation evidence

495 public reports collected from VulnCheck and CIRCL, first on Jun 26, 2025. Each links to its original source. We have not verified them.

Description

Citrix NetScaler ADC and Gateway contain an out-of-bounds read vulnerability due to insufficient input validation. This vulnerability can lead to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.

Required action (CISA)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

References

← Back to the CVE Tracker

Our coverage of CVE-2025-5777

CVE-2025-5777

Ransomware Groups Turn to Citrix Bleed 2, BYOVD, and Supply Chain Credentials

Threat actors are increasingly leveraging a combination of sophisticated techniques, including the exploitation of a critical Citrix vulnerability, Bring Your Own Vulnerable Driver (BYOVD) attacks, and the misuse of compromised supply chain credentials, to gain initial access for ransomware operations.