Vulnerability details
CVE-2025-6543
Actively exploited
NetScaler ADCNetScaler Gateway
Memory overflow vulnerability leading to unintended control flow and Denial of Service
CVSS 4.0
9.2Critical
Remedy
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. (due: 2025-07-21)
Versions not listed as affected in the CVE record:
- ADC — version 47.46 and later
- ADC — version 59.19 and later
- ADC — version 37.236 and later
- Gateway — version 47.46 and later
- Gateway — version 59.19 and later
- Gateway — version 37.236 and later
Official description
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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.2Critical | 4.0 | CVEProject cvelistV5 (CNA) (Citrix) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| NetScaler | ADC | 13.1 ≤ v < 59.19 | CVEProject cvelistV5 (CNA) |
| NetScaler | ADC | 13.1 FIPS and NDcPP ≤ v < 37.236 | CVEProject cvelistV5 (CNA) |
| NetScaler | ADC | 14.1 ≤ v < 47.46 | CVEProject cvelistV5 (CNA) |
| NetScaler | Gateway | 13.1 ≤ v < 59.19 | CVEProject cvelistV5 (CNA) |
| NetScaler | Gateway | 13.1 FIPS and NDcPP ≤ v < 37.236 | CVEProject cvelistV5 (CNA) |
| NetScaler | Gateway | 14.1 ≤ v < 47.46 | CVEProject cvelistV5 (CNA) |
References and advisories
2
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Details
- Published
- 2025-06-25
- Last updated
- 2026-02-26
- State
- Published
- Assigner (CNA)
- Citrix
- Kolun priority
- 78 · High
CISA KEV catalog
- Date added
- 2025-06-30
- Due date
- 2025-07-21
- Used in ransomware
- Unknown
Exploit prediction (EPSS)
10.43%
Probability of exploitation in 30 days
95.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Active
- Technical impact
- Total
Weaknesses (CWE)
- CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer