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Citrix Bleed 2 exploited weeks before PoCs as Citrix denied attacks

A critical Citrix NetScaler vulnerability, tracked as CVE-2025-5777 and dubbed "CitrixBleed 2," was actively exploited nearly two weeks before proof-of-concept (PoC) exploits were made public, despite Citrix stating that there was no evidence of attacks. GreyNoise has confirmed its honeypots detected targeted exploitation from IP addresses located in China on June 23, 2025. "GreyNoise has observed active exploitation attempts against CVE-2025-5777 (CitrixBleed 2), a memory overread vulnerabili

CISA warns hackers are actively exploiting critical ‘Citrix Bleed 2’ security flaw

U.S. cybersecurity agency CISA says hackers are actively exploiting a critical-rated security flaw in a widely used Citrix product, and has given other federal government departments just one day to patch their systems. Security researchers have dubbed the bug “Citrix Bleed 2” for its similarity to a 2023 security flaw in Citrix NetScaler, a networking product that large companies and governments rely on for allowing their staff to remotely access apps and other resources on their internal netw

CISA confirms hackers are actively exploiting critical ‘Citrix Bleed 2’ bug

U.S. cybersecurity agency CISA says hackers are actively exploiting a critical-rated security flaw in a widely used Citrix product, and has given other federal government departments just one day to patch their systems. Security researchers have dubbed the bug “Citrix Bleed 2” for its similarity to a 2023 security flaw in Citrix NetScaler, a networking product that large companies and governments rely on for allowing their staff to remotely access apps and other resources on their internal netw

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 during login attempts. This critical flaw is named CitrixBleed2 as it close

Public exploits released for CitrixBleed 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 during login attempts. This flaw is named CitrixBleed2 as it closely resemb

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 other client-side attacks, is enabled by default. However, while it is designed to b

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 to access restricted memory regions. A similar Citrix security flaw, dubbed

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 be triggered by unauthenticated, remote requests, leading the appliance to go offline. The fl

New 'CitrixBleed 2' NetScaler flaw let hackers hijack sessions

A recent vulnerability in Citrix NetScaler ADC and Gateway is dubbed "CitrixBleed 2," after its similarity to an older exploited flaw that allowed unauthenticated attackers to hijack authentication session cookies from vulnerable devices. Last week, Citrix published a security bulletin warning about flaws tracked as CVE-2025-5777 and CVE-2025-5349 that impact NetScaler ADC and Gateway versions before 14.1-43.56, releases before 13.1-58.32, and also 13.1-37.235-FIPS/NDcPP and 2.1-55.328-FIPS. T