All vulnerabilities
CVE-2025-5777

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

Citrix NetScaler ADC and GatewayNetwork & edge
Open in ThreatlineRecord JSON
CVSS
9.3Critical
ExploitationExploited in the wildAdded to KEV 10 Jul 2025. Known ransomware useCISA KEV
Exploit odds (EPSS)>99.9%Chance of exploitation activity in the next 30 days, higher than 99.9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in43.56Also 58.32CVE List
Federal deadline11 Jul 2025Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA KEV

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 17 Jun 2025, 12:29 UTCPublishedCVE List
  2. 10 Jul 2025Added to CISA KEVCISA KEV
  3. 11 Aug 2025Exploit code publicExploit-DB

Public exploit code and templates 2

  • Remote exploitCitrix NetScaler ADC/Gateway 14.1 - Memory Disclosure 11 Aug 2025Exploit-DB
  • Scanner templateCitrix NetScaler Memory Disclosure - CitrixBleed 2Nuclei

Listed so defenders can prioritize. Threatline links to the source and does not host exploit code.

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.

Text from CVE List

Affected versions 4

  • ADCaffected: 14.1 before 43.56CVE List
  • ADCaffected: 13.1 before 58.32CVE List
  • Gatewayaffected: 14.1 before 43.56CVE List
  • Gatewayaffected: 13.1 before 58.32CVE List

References 11