On 2025-07-10, CISA added CVE-2025-5777 (Citrix NetScaler ADC and Gateway) to its Known Exploited Vulnerabilities (KEV) catalog [2]. The vulnerability is listed in the catalog as "Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability" [2]. CISA requires remediation in accordance with the listed vendor mitigation guidance; see the original text in the body for specific requirements [2].
Backfill: this event became public on Jul 10, 2025 and we added it on Nov 10, 2026. It is not a new event.
CISA Adds Citrix NetScaler ADC and Gateway Vulnerability CVE-2025-5777 to Known Exploited Vulnerabilities Catalog
1 min read
- Disclosed
- Jul 10, 2025
- Published
- Nov 10, 2026
- Last updated
- Nov 8, 2026
- CVSS basis
- Our assessment
- 100%, higher than 100% of CVEs
- Exploitation and patch status
- ExploitedKEV
- Attack vector
- Vulnerability status
- Actor type
- Motivation
On this page
30-second summary
What happened
Who is affected
Industries mainly affected: Government, Cross-industry
What to do nowOur advice
CISA requires remediation in accordance with the listed vendor mitigation guidance; see the original text in the body for specific requirements [2].
Timeline
Technical details
CISA KEV Listing Record
CISA added CVE-2025-5777 (Citrix NetScaler ADC and Gateway) to the Known Exploited Vulnerabilities () catalog on 2025-07-10 [2].
Original Technical 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 ( virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server. [2]
Official Required Action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. [2]
Individual Vulnerability Record
The U.S. National Vulnerability Database (NVD) provides an independent vulnerability record and description for CVE-2025-5777 [1].
References
Official / primary3
- [1]
“Insufficient input validation leading to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server”
- [2]
This site aggregates public information and is not security consulting advice. Test remediation steps before applying.