CVE-2025-5777
Citrix NetScaler ADC and Gateway contain an out-of-bounds read vulnerability due to insufficient input validation. This vulnerability can lead to…
Browse: All 2025 CVEs · All vendors
- CVSS score
- 7.5 High
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N- CISA KEV
- Yes — actively exploited (added 2025-07-10, remediation due 2025-07-11)
- Ransomware
- Known ransomware campaign use
- Weakness (CWE)
- CWE-125, CWE-908, CWE-457
- Published
- 2025-06-17
- Last modified
- 2026-08-04
- NVD status
- Analyzed
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.
Affected products
- citrix netscaler application delivery controller
- citrix netscaler gateway
Affected ranges per NVD CPE data; confirm exact versions in the vendor advisory.
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. Federal remediation deadline: 2025-07-11.
How to prioritize this
This vulnerability is on the CISA KEV list, meaning it is being actively exploited — treat it as urgent regardless of the raw CVSS number. Use the live CVE lookup for the latest NVD data, and the CVSS 3.1 calculator to model your own environmental score.
References
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420
- https://citrixbleed.com
- https://horizon3.ai/attack-research/attack-blogs/cve-2025-5777-citrixbleed-2-write-up-maybe/
- https://labs.watchtowr.com/how-much-more-must-we-bleed-citrix-netscaler-memory-disclosure-citrixbleed-2-cve-2025-5777/
- https://www.bleepingcomputer.com/news/security/cisa-tags-citrix-bleed-2-as-exploited-gives-agencies-a-day-to-patch/
- https://www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/
- https://www.theregister.com/2025/07/10/cisa_citrixbleed_kev/
- https://doublepulsar.com/citrixbleed-2-exploitation-started-mid-june-how-to-spot-it-f3106392aa71
FAQ
Is CVE-2025-5777 actively exploited?
Yes. CISA added CVE-2025-5777 to its Known Exploited Vulnerabilities (KEV) catalog on 2025-07-10, with a federal remediation deadline of 2025-07-11. A KEV listing means real-world exploitation is confirmed, so patching this should be prioritized above many higher-CVSS bugs that aren't being exploited.
What is the CVSS score of CVE-2025-5777?
CVE-2025-5777 has a CVSS base score of 7.5 (High). Its vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Related vulnerabilities
- CVE-2025-6543 — Citrix NetScaler ADC and Gateway
- CVE-2026-8452 — Citrix NetScaler ADC and NetScaler Gateway
- CVE-2026-3055 — Citrix NetScaler
- CVE-2025-7775 — Citrix NetScaler
- CVE-2024-8068 — Citrix Session Recording
- CVE-2024-8069 — Citrix Session Recording
Data source: NVD & CISA KEV. Shown as-is; nothing added. Last generated from NVD data — re-check the live tool for updates.
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