CVE-2025-5349

Citrix NetScaler ADC and NetScaler Gateway customers have been hit by a new round of zero day vulnerabilities that require urgent patching, including one the company warned is being actively exploited. That exploitation alert makes the highest priority flaw, CVE-2025-7775, the one admins will want to start with. According to Citrix’s advisory, it’s a memory […]

Attackers are exploiting a Citrix NetScaler vulnerability to breach critical organizations, notably in the Netherlands, but most likely in other countries as well. The Netherlands’ National Cyber Security Centre (NCSC) has tracked vulnerabilities caused by a memory overflow bug that allows threat actors to launch “sophisticated” remote code execution (RCE) and distributed denial of service […]

U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds Citrix NetScaler ADC and Gateway flaw to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added Citrix NetScaler ADC and Gateway flaw, tracked as CVE-2025-5777, to its Known Exploited Vulnerabilities (KEV) catalog. The CVE-2025-5777 flaw, dubbed ‘CitrixBleed 2‘ (CVSS v4.0 Base Score of 9.3), […]

Security researchers have released a technical analysis and proof-of-concept exploit code for a critical vulnerability fixed last month in Citrix NetScaler appliances that is suspected to have been exploited in the wild, though in a limited capacity and without official confirmation from Citrix. Companies are urged to deploy the patches and use published indicators of […]

Background and Confusion On June 17, 2025, Citrix published an advisory detailing CVE-2025-5777 and CVE-2025-5349. Affected products include: On June 25, 2025, they also published an advisory detailing CVE-2025-6543. Affected products include: Of the three vulnerabilities, two of them have been receiving a bit of buzz: While we’ve developed a working exploit for one of […]

For the latest discoveries in cyber research for the week of 6th July, please download our Threat Intelligence Bulletin. TOP ATTACKS AND BREACHES The International Criminal Court (ICC) disclosed a sophisticated cyber‐security incident in late June 2025, its second such event in recent years. The intrusion, which occurred in June 2025, was promptly detected and […]

Here’s an overview of some of last week’s most interesting news, articles, interviews and videos: Sudo local privilege escalation vulnerabilities fixed (CVE-2025-32462, CVE-2025-32463) If you haven’t recently updated the Sudo utility on your Linux box(es), you should do so now, to patch two local privilege escalation vulnerabilities (CVE-2025-32462, CVE-2025-32463) that have been disclosed on Monday. Google patches actively exploited Chrome (CVE‑2025‑6554) Google has released a security update for Chrome to address a zero‑day vulnerability (CVE-2025-6554) … More →

While Citrix has observed some instances where CVE-2025-6543 has been exploited on vulnerable NetScaler networking appliances, the company still says that they don’t have evidence of exploitation for CVE-2025-5349 or CVE-2025-5777, both of which have been patched earlier this month. CVE-2025-5777, in particular, has captured the attention of infosec professionals due to its similarity to CVE-2023-4966, aka CitrixBleed. Consequently, CVE-2025-5777 has been informally dubbed “CitrixBleed 2” by security researcher Kevin Beaumont. Both CitrixBleed and CitrixBleed … More →

New Citrix flaw ‘CitrixBleed 2’ lets attackers steal session cookies without logging in, echoing a previously exploited vulnerability. A new flaw in Citrix NetScaler ADC and Gateway, dubbed ‘CitrixBleed 2‘ (CVE-2025-5777, CVSS v4.0 Base Score of 9.3), can allow unauthenticated attackers to steal session cookies, similar to a past critical exploit. The vulnerability is an […]

For the latest discoveries in cyber research for the week of 23rd June, please download our Threat Intelligence Bulletin. TOP ATTACKS AND BREACHES Scania, a Swedish manufacturer of heavy trucks and engines, has suffered a data breach that resulted in the theft of insurance claim documents from its Financial Services systems via compromised credentials of […]

Citrix has fixed a critical vulnerability (CVE-2025-5777) in NetScaler ADC and NetScaler Gateway reminiscent of the infamous and widely exploited CitrixBleed flaw. The vulnerabilities have been privately disclosed and there is no indication that they are under active exploitation. Nevertheless, the company has urged to install the relevant updated versions as soon as possible and terminate active sessions. About the vulnerabilities (CVE-2025-5777, CVE-2023-4966) CVE-2025-5777 is an out-of-bounds read flaw stemming from insufficient input validation. Like … More →

Citrix has released patches for critical- and high-severity vulnerabilities in NetScaler and Secure Access Client and Workspace for Windows.