Citrix has launched safety updates to deal with a essential flaw affecting NetScaler ADC that it mentioned has been exploited within the wild.
The vulnerability, tracked as CVE-2025-6543, carries a CVSS rating of 9.2 out of a most of 10.0.
It has been described as a case of reminiscence overflow that would end in unintended management movement and denial-of-service. Nonetheless, profitable exploitation requires the equipment to be configured as a Gateway (VPN digital server, ICA Proxy, CVPN, RDP Proxy) or AAA digital server.
The shortcoming impacts the beneath variations –
- NetScaler ADC and NetScaler Gateway 14.1 previous to 14.1-47.46
- NetScaler ADC and NetScaler Gateway 13.1 previous to 13.1-59.19
- NetScaler ADC and NetScaler Gateway 12.1 and 13.0 (susceptible and end-of-life)
- NetScaler ADC 13.1-FIPS and NDcPP previous to 13.1-37.236-FIPS and NDcPP
“Safe Personal Entry on-prem or Safe Personal Entry Hybrid deployments utilizing NetScaler situations are additionally affected by the vulnerabilities,” Citrix mentioned.
“Prospects must improve these NetScaler situations to the beneficial NetScaler builds to deal with the vulnerabilities.”
The corporate didn’t reveal how the flaw is being exploited in real-world assaults, however mentioned “exploits of CVE-2025-6543 on unmitigated home equipment have been noticed.”
The disclosure comes shortly after Citrix patched one other critical-rated safety flaw in NetScaler ADC (CVE-2025-5777, CVSS rating: 9.3) that might be exploited by risk actors to achieve entry to inclined home equipment.
