CyberSecurity news
FlagThis - #netscaler
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@socprime.com
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Citrix NetScaler ADC and Gateway systems are currently facing a critical security threat, identified as CVE-2025-5777, and widely nicknamed "CitrixBleed 2". This vulnerability, similar to the infamous CitrixBleed from 2023, allows unauthenticated attackers to exploit memory overread issues. This exploitation can lead to the disclosure of sensitive information, including session tokens and user credentials, enabling attackers to bypass multi-factor authentication and hijack active remote sessions. Security researchers have noted that exploitation of this flaw began as early as mid-June, with evidence pointing to its use in active hacking campaigns.
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has officially added CVE-2025-5777 to its Known Exploited Vulnerabilities catalog, citing evidence of active exploitation. This designation carries significant weight, and CISA has issued a stern warning, urging federal civilian agencies to apply necessary patches within 24 hours. The urgency stems from the understanding that vulnerabilities like this are frequent vectors for malicious cyber actors, posing a substantial risk to government and corporate networks. While Citrix initially released guidance and patches in June, concerns have been raised about the vendor's response in acknowledging the widespread exploitation of this critical flaw. The exploitation of CitrixBleed 2, alongside other critical vulnerabilities like CVE-2025-5349 and CVE-2025-6543, presents a significant risk to organizations. CVE-2025-5777 specifically allows attackers to steal session tokens, effectively enabling them to impersonate authenticated users and bypass security measures like MFA. This is a direct echo of the impact of the original CitrixBleed vulnerability, which was widely abused by nation-state actors and ransomware groups. The ongoing exploitation means that a considerable portion of the Citrix NetScaler user base may still be vulnerable, underscoring the critical need for immediate patching and diligent security practices.
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David Jones@cybersecuritydive.com
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The cybersecurity community is on high alert due to the active exploitation of a critical vulnerability in Citrix NetScaler devices, known as CitrixBleed 2 (CVE-2025-5777). This flaw allows attackers to perform dangerous memory leak attacks, potentially exposing sensitive user credentials and other confidential data. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has officially recognized the severity of this threat by adding it to its Known Exploited Vulnerabilities catalog, citing evidence of active exploitation. Federal agencies have been given a strict 24-hour deadline to patch affected systems, underscoring the urgency of the situation and the significant risk posed to government and enterprise networks.
CitrixBleed 2, which researchers have noted shares similarities with a previous critical vulnerability in Citrix NetScaler (CVE-2023-4966), enables attackers to bypass multi-factor authentication (MFA) and hijack user sessions. This memory leak vulnerability, stemming from insufficient input validation, allows unauthenticated attackers to read sensitive information from NetScaler devices configured as Gateways or AAA virtual servers. The exploitation of this flaw appears to have begun in late June, with reports indicating that some attackers may be linked to ransomware groups. The ease with which session tokens can be stolen and replayed to impersonate authenticated users presents a substantial threat to organizations relying on these Citrix products for remote access. In response to the escalating threat, cybersecurity researchers have confirmed widespread scanning and probing activity for the vulnerability. The U.S. CISA's inclusion of CVE-2025-5777 on its Known Exploited Vulnerabilities list serves as a strong warning to all organizations to prioritize patching their Citrix NetScaler ADC and Gateway devices immediately. Failure to do so leaves networks vulnerable to sophisticated attacks that can lead to significant data breaches and operational disruptions. Organizations are strongly advised to apply the latest security patches and updates as soon as possible to mitigate the risks associated with this critical vulnerability.
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