CVE-2025-6543Memory overflow vulnerability leading to unintended control flow and Denial of Service
Updated under an hour ago ()
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It affects NetScaler ADC and 3 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Jun 30, 2025; federal agencies had to remediate by Jul 21, 2025. Treat that date as your deadline.
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Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server
- CVSS
- 9.2 CRITICAL (v4.0, CNA)CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
- Weakness (CWE)
- CWE-119
- Known exploited
- Added to CISA KEV Jun 30, 2025; federal remediation due Jul 21, 2025Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 10.56% (percentile 96)
- Assigned by
- Citrix
- NVD analysis
- Analyzed
- Record last updated
- Feb 26, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
NetScaler ADC netscaler:adc (from the name) | from 14.1 before 47.46; from 13.1 before 59.19; from 13.1 FIPS and NDcPP before 37.236 | CNA record |
NetScaler Gateway netscaler:gateway (from the name) | from 14.1 before 47.46; from 13.1 before 59.19; from 13.1 FIPS and NDcPP before 37.236 | CNA record |
citrix netscaler_application_delivery_controller citrix:netscaler_application_delivery_controller | from 13.1 before 13.1-37.236; from 13.1 before 13.1-37.236; from 13.1 before 13.1-59.19; from 14.1 before 14.1-47.46 | NVD |
citrix netscaler_gateway citrix:netscaler_gateway | from 13.1 before 13.1-59.19; from 14.1 before 14.1-47.46 | NVD |
References
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-6543us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.