Known exploited vulnerability
CVE-2025-5777
The short answer
CVE-2025-5777 affects NetScaler ADC and is rated critical (CVSS 9.3). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-07-10: attackers are using it, so patch it first.
What it is
Severity
9.3 critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Exploited (CISA KEV)
Yes, since Jul 10, 2025
Federal due date Jul 11, 2025
EPSS, next 30 days
100%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- None
- User interaction
- None
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
ADC, Gateway. NVD's record lists the exact affected versions.
References
- support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420 Vendor Advisory
- citrixbleed.com Broken LinkThird Party Advisory
- horizon3.ai/attack-research/attack-blogs/cve-2025-5777-citrixbleed-2-write-up-maybe/ Third Party Advisory
- labs.watchtowr.com/how-much-more-must-we-bleed-citrix-netscaler-memory-disclosure-citrixbleed-2-cve-2025-5777/ Third Party Advisory
- www.bleepingcomputer.com/news/security/cisa-tags-citrix-bleed-2-as-exploited-gives-agencies-a-day-to-patch/ Press/Media CoverageThird Party Advisory
- www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/ Third Party Advisory
- www.theregister.com/2025/07/10/cisa_citrixbleed_kev/ Press/Media Coverage
- doublepulsar.com/citrixbleed-2-exploitation-started-mid-june-how-to-spot-it-f3106392aa71 Third Party Advisory
- reliaquest.com/blog/threat-spotlight-citrix-bleed-2-vulnerability-in-netscaler-adc-gateway-devices/ Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-5777 US Government Resource
Questions
Is CVE-2025-5777 being exploited?
Yes. CISA added CVE-2025-5777 to its Known Exploited Vulnerabilities catalog on 2025-07-10, with a federal remediation due date of 2025-07-11. CISA lists it as used in ransomware campaigns.
How do I fix CVE-2025-5777?
CISA's 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.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
Related
Latest CVEs this week
Critical and High CVEs from the last 7 days, with KEV and EPSS.
Exploited vulnerabilities by vendor
Every vendor in CISA's KEV catalog, with its count.
Citrix exploited vulnerabilities
Everything CISA lists as exploited for Citrix.
Vulnerability watch
A briefing and a fix pull request when an advisory hits your dependencies.
Know the day a CVE lands in your code
Connect a GitHub repository and ZeusQA checks its dependencies daily, briefs each advisory and opens the fix. Three test runs free, no card.