Netscaler
Public exploits released for Citrix Bleed 2 NetScaler flaw, patch now
Researchers have released proof-of-concept (PoC) exploits for a critical Citrix NetScaler vulnerability, tracked as CVE-2025-5777 and dubbed CitrixBleed2, warning that the flaw is easily exploitable and can successfully steal user session tokens. The CitrixBleed 2 vulnerability, which affects Citrix NetScaler ADC and Gateway devices, allows attackers to retrieve memory contents simply by sending malformed POST requests […]
Citrix warns of login issues after NetScaler auth bypass patch
Citrix warns that patching recently disclosed vulnerabilities that can be exploited to bypass authentication and launch denial-of-service attacks may also break login pages on NetScaler ADC and Gateway appliances. This happens because starting with NetScaler 14.1.47.46 and 13.1.59.19, the Content Security Policy (CSP) header, which mitigates risks associated with cross-site scripting (XSS), code injection, and […]
Over 1,200 Citrix servers unpatched against critical auth bypass flaw
Over 1,200 Citrix NetScaler ADC and NetScaler Gateway appliances exposed online are unpatched against a critical vulnerability believed to be actively exploited, allowing threat actors to bypass authentication by hijacking user sessions. Tracked as CVE-2025-5777 and referred to as Citrix Bleed 2, this out-of-bounds memory read vulnerability results from insufficient input validation, enabling unauthenticated attackers […]
Citrix warns of NetScaler vulnerability exploited in DoS attacks
Citrix is warning that a vulnerability in NetScaler appliances tracked as CVE-2025-6543 is being actively exploited in the wild, causing devices to enter a denial of service condition. “Exploits of CVE-2025-6543 on unmitigated appliances have been observed,” warns Citrix’s advisory. Tracked internally as CTX694788, CVE-2025-6543 is a critical flaw impacting NetScaler ADC and NetScaler Gateway and can […]
Citrix shares mitigations for ongoing Netscaler password spray attacks
Citrix Netscaler is the latest target in widespread password spray attacks targeting edge networking devices and cloud platforms this year to breach corporate networks. In March, Cisco reported that threat actors were conducting password spray attacks on the Cisco VPN devices. In some cases, these attacks caused a denial-of-service state, allowing the company to find a DDoS vulnerability […]