CVE-2023-3519

When a $2B merger put a global chemical manufacturer’s security to the test, NodeZero® exposed critical identity risks and domain compromise paths in just 35 minutes. What began as a pilot evolved into a global Pentest Wednesday® program—turning vulnerability data into proof of resilience across 20 sites and thousands of endpoints.

China-linked Silk Typhoon APT group ramp up North America attacks, exploiting n-day and zero-day flaws for system access, CrowdStrike warns. China-linked Silk Typhoon APT group (aka Murky Panda) targets organizations in North America exploiting n-day and zero-day flaws for system access, CrowdStrike warns. This Chinese APT has one of the widest targeting scopes. In March, […]

In its recently released 2025 Threat Hunting Report, Crowdstrike pointed out an interesting trend: a 136% surge in cloud intrusions. A good chunk of this surge is due to “China-nexus adversaries”, Murky Panda (aka Silk Typhoon) among them. Murky Panda’s modus operandi The group has been active since at least 2023, and is primarily focused on breaching government, technology, academia, legal, and professional services entities in North America and stealing sensitive information from them. The … More →

Silk Typhoon was seen exploiting n-day and zero-day vulnerabilities for initial access to victim systems.

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 […]

A China-aligned threat group tracked by Microsoft as Silk Typhoon, two members of which were recently charged by US authorities, has recently shifted its focus to the enterprise IT supply chain by compromising cloud IT services and software providers and then moving downstream to their customers, according to a report from Microsoft. Silk Typhoon, known […]

From zero-day exploits to weaknesses in widely used software and hardware, the vulnerabilities uncovered last year underscore threat actors’ tactics and the critical gaps in organizational defenses. This roundup showcases the standout findings from 2024’s cybersecurity reports, highlighting critical risks and emerging threats that demand attention. Whether you’re a security leader, IT professional, or cybersecurity-conscious, these insights will help frame the priorities and strategies needed to stay resilient. Zero-days dominate top frequently exploited vulnerabilities The … More →

Japanese authorities attributed a cyber-espionage campaign targeting the country to the China-linked APT group MirrorFace. The National Police Agency (NPA) and the Cabinet Cyber Security Center in Japan have linked a long-running cyber-espionage campaign targeting local entities to the China-linked group MirrorFace (aka Earth Kasha). The campaign has been active since at least 2019, it […]

A joint report by leading cybersecurity agencies from the U.S., UK, Canada, Australia, and New Zealand has identified the most commonly exploited vulnerabilities of 2023. Zero-day vulnerabilities on the rise The advisory highlights that malicious cyber actors increasingly targeted zero-day vulnerabilities, posing significant threats to enterprise networks. Notably, the exploitation of these zero-days rose compared to 2022. Unlike previous years, where older, unpatched vulnerabilities dominated the list, 2023 saw a spike in zero-day exploits, reflecting … More →

Most of the top frequently exploited vulnerabilities in 2023 were initially exploited as zero-days, according to data from government agencies.

The ransomware landscape has seen a lot of fragmentation over the past couple of years with major groups shutting down after they became the target of law enforcement actions or after they attracted too much attention and had ransoms put on their leaders’ identities. Ransomware-as-a-service (RaaS) operations are heavily reliant on third-party hackers, known as […]

Warnings went out this week to infosec leaders about two groups of Iranian threat actors attacking American and other organizations. The US Cybersecurity and Infrastructure Security Agency (CISA), the FBI and the Defense Department’s Cyber Crime Centre said a group of Iranian hackers are working with ransomware gangs on attacks. “The Iranian cyber actors’ involvement […]

The cybercrime group ExCobalt targeted Russian organizations in multiple sectors with a previously unknown backdoor known as GoRed. Positive Technologies researchers reported that a cybercrime gang called ExCobalt targeted Russian organizations in multiple sectors with a previously unknown Golang-based backdoor known as GoRed. Members of the ExCobalt group have been active since at least 2016, […]

From October-December, the activities of DarkGate, Pikabot, IcedID and more were seen and shared with the broader community via social media

Yamaha Motor discloses ransomware attack impacting the personal information of its Philippines subsidiary’s employees.

A recently patched Citrix NetScaler ADC/Gateway information disclosure vulnerability (CVE-2023-4966) has been exploited by attackers in the wild since late August 2023, Mandiant researchers have revealed. About CVE-2023-4966 Citrix’s security advisory, published on October 10, says that the vulnerability can lead to sensitive information disclosure, but did not explain what type of information can be disclosed to attackers. CVE-2023-4966 is exploitable remotely without authentication, and a successful attack does not hinge on user interaction. The … More →

Experts reported that the vulnerability CVE-2023-4966 in Citrix NetScaler ADC/Gateway devices has been exploited in attacks since late August. On October 10, Citrix published a security bulletin related to a critical vulnerability, tracked as CVE-2023-4966, in Citrix NetScaler ADC/Gateway devices. “Exploits of CVE-2023-4966 on unmitigated appliances have been observed.” reported Citrix. “Cloud Software Group strongly urges customers of […]

A new round of the weekly SecurityAffairs newsletter arrived! Every week the best security articles from Security Affairs are free for you in your email box. Enjoy a new round of the weekly SecurityAffairs newsletter, including the international press. Lockbit ransomware gang demanded an 80 million ransom to CDW CISA warns of vulnerabilities and misconfigurations […]

IBM observed a credential harvesting campaign that is targeting Citrix NetScaler gateways affected by the CVE-2023-3519 vulnerability. IBM’s X-Force researchers reported that threat actors are conducting a large-scale credential harvesting campaign exploiting the recent CVE-2023-3519 vulnerability (CVSS score: 9.8) in Citrix NetScaler Gateways. At the end of July, Citrix warned customers that the CVE-2023-3519 flaw in NetScaler […]

Threat actors are targeting Citrix NetScaler instances unpatched against CVE-2023-3519 to steal user credentials.

For the latest discoveries in cyber research for the week of 4th September, please download our Threat_Intelligence Bulletin TOP ATTACKS AND BREACHES The FBI announced operation ‘Duck Hunt’ dismantling the Qakbot (Qbot) malware operation that is active since at least 2008. Qakbot has been known to infect victims via spam emails with malicious attachments and […]

A known threat actor specializing in ransomware attacks is believed to be behind a recent campaign that targeted unpatched internet-facing Citrix NetScaler systems to serve as an initial foothold into enterprise networks. “Our data indicates strong similarity between attacks using CVE-2023-3519 and previous attacks using a number of the same TTPs,” Sophos researchers shared. Citrix systems under attack In mid-July 2023, a zero-day remote code execution (RCE) vulnerability (CVE-2023-3519) started getting exploited in the wild. … More →

A financially motivated actor linked to the FIN8 group exploits the CVE-2023-3519 RCE in attacks on Citrix NetScaler systems in massive attacks. Sophos X-Ops is tracking an ongoing campaign, which is targeting Citrix NetScaler systems, conducted by threat actors linked to the FIN8 group [BleepingComputer, SOCRadar]. The hackers are exploiting the remote code execution, tracked […]

For the latest discoveries in cyber research for the week of 21st August, please download our Threat_Intelligence Bulletin TOP ATTACKS AND BREACHES The German Federal Bar (BRAK) Association, which oversees 28 regional bars throughout Germany and represents approximately 166,000 lawyers on a national and international scale, is currently investigating a ransomware attack on its Brussels […]

Here’s an overview of some of last week’s most interesting news, articles, interviews and videos: Deception technology and breach anticipation strategies In this Help Net Security interview, Xavier Bellekens, CEO of Lupovis, explains how the implementation of deception-as-a-service offers an extra layer of defense, aiding both the CISO and their team with early warning indicators of potential breaches. Balancing telecom security, law enforcement, and customer trust In this Help Net Security interview, Mark O’Neill, CTO … More →

A new round of the weekly SecurityAffairs newsletter arrived! Every week the best security articles from Security Affairs are free for you in your email box. Enjoy a new round of the weekly SecurityAffairs newsletter, including the international press. Over 3,000 Android Malware spotted using unsupported/unknown compression methods to avoid detection WinRAR flaw enables remote […]

Exploitation of a Citrix ShareFile vulnerability tracked as CVE-2023-24489 has spiked as CISA added it to its ‘must patch’ catalog.

Administrators of Citrix NetScaler ADC and Gateway appliances should check for evidence of installed webshells even if they implemented fixes for CVE-2023-3519 quickly: A recent internet scan by Fox-IT researchers has revealed over 1,800 backdoored NetScaler devices, 69% of which have been patched for the flaw. “This indicates that while most administrators were aware of the vulnerability and have since patched their NetScalers to a non-vulnerable version, they have not been (properly) checked for signs … More →

A threat actor has compromised roughly 2,000 Citrix NetScaler servers exploiting a remote code execution tracked as CVE-2023-3519. In July Citrix warned customers of a critical vulnerability, tracked as CVE-2023-3519 (CVSS score: 9.8), in NetScaler Application Delivery Controller (ADC) and Gateway that is being actively exploited in the wild The vulnerability CVE-2023-3519 (CVSS score: 9.8) is a code injection that […]

A threat actor has exploited a recent Citrix vulnerability (CVE-2023-3519) to infect roughly 2,000 NetScaler instances with a backdoor.

A new round of the weekly SecurityAffairs newsletter arrived! Every week the best security articles from Security Affairs are free for you in your email box. Enjoy a new round of the weekly SecurityAffairs newsletter, including the international press. Reptile Rootkit employed in attacks against Linux systems in South Korea New PaperCut flaw in […]

Researchers warn that hundreds of Citrix servers have been hacked in an ongoing campaign exploiting the RCE CVE-2023-3519. Security researchers from the non-profit organization Shadowserver Foundation reported that hundreds of Citrix Netscaler ADC and Gateway servers have already been compromised as part of an ongoing campaign exploiting the critical remote code execution (RCE) vulnerability CVE-2023-3519. […]

RCE vulnerability CVE-2023-3519 affects Citrix NetScaler products. This threat brief examines the current evidence, attack scope and interim guidance.

The US Cybersecurity and Infrastructure Security Agency (CISA) reported last week that attackers are actively exploiting a critical remote code execution vulnerability patched earlier this month in NetScaler ADC (formerly Citrix ADC) and NetScaler Gateway (formerly Citrix Gateway). Researchers believe there are multiple similar vulnerabilities and that over 50% of appliances connected to the internet […]

For the latest discoveries in cyber research for the week of 24th July, please download our Threat_Intelligence Bulletin TOP ATTACKS AND BREACHES Check Point Harmony Endpoint and Threat Emulation provide protection against this threat (Ransomware.Win.Snatch) Check Point Harmony Endpoint and Threat Emulation provide protection against these threats (Ransomware.Win.BlackCat, Ransomware.Win.Clop, Ransomware_Linux_Clop) VULNERABILITIES AND PATCHES Citrix has […]

Over 20,000 appliances are vulnerable to a new exploit technique targeting a recent Citrix ADC zero-day vulnerability CVE-2023-3519.

Last week on Malwarebytes Labs:Stay safe!Malwarebytes EDR and MDR removes all remnants of ransomware and prevents you from getting reinfected. Want…

A new round of the weekly SecurityAffairs newsletter arrived! Every week the best security articles from Security Affairs are free for you in your email box. Enjoy a new round of the weekly SecurityAffairs newsletter, including the international press. Multiple DDoS botnets were observed targeting Zyxel devices CISA warns of attacks against Citrix NetScaler ADC […]

Researchers reported that more than 15000 Citrix servers exposed online are likely vulnerable to attacks exploiting the vulnerability CVE-2023-3519. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) this week warned of cyber attacks against Citrix NetScaler Application Delivery Controller (ADC) and Gateway devices exploiting recently discovered zero-day CVE-2023-3519. The Agency states that threat actors targeted a NetScaler […]

Here’s an overview of some of last week’s most interesting news, articles, interviews and videos: Citrix ADC zero-day exploitatation: CISA releases details about attack on CI organization (CVE-2023-3519) The exploitation of the Citrix NetScaler ADC zero-day vulnerability (CVE-2023-3519) was first spotted by a critical infrastructure organization, who reported it to the Cybersecurity and Infrastructure Security Agency (CISA). North Korean hackers targeted tech companies through JumpCloud and GitHub North Korean state-sponsored hackers have been linked to … More →

The US CISA warns of cyber attacks targeting Citrix NetScaler Application Delivery Controller (ADC) and Gateway devices. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) warning of cyber attacks against Citrix NetScaler Application Delivery Controller (ADC) and Gateway devices exploiting recently discovered zero-day CVE-2023-3519. The Agency states that threat actors targeted a NetScaler ADC appliance […]

The exploitation of the Citrix NetScaler ADC zero-day vulnerability (CVE-2023-3519) was first spotted by a critical infrastructure organization, who reported it to the Cybersecurity and Infrastructure Security Agency (CISA). “In June 2023, threat actors exploited this vulnerability as a zero-day to drop a webshell on a critical infrastructure organization’s non-production environment NetScaler ADC appliance. The webshell enabled the actors to perform discovery on the victim’s active directory (AD) and collect and exfiltrate AD data. The … More →

CISA says the new Citrix zero day vulnerability tracked as CVE-2023-3519 has been exploited against a critical infrastructure organization.

Citrix has patched several vulnerabilities, including CVE-2023-3519, a critical remote code execution zero-day that has been exploited in attacks.

Citrix has patched three vulnerabilities (CVE-2023-3519, CVE-2023-3466, CVE-2023-3467) in NetScaler ADC (formerly Citrix ADC) and NetScaler Gateway (formerly Citrix Gateway), one of which is a zero-day being exploited by attackers. A zero-day patched (CVE-2023-3519) CVE-2023-3519 is a remote code execution (RCE) vulnerability that could allow an unauthenticated threat actor to execute arbitrary code on a vulnerable server. At this time there is no public PoC, but the vulnerability has been observed being exploited in the … More →

Citrix is warning customers of an actively exploited critical vulnerability in NetScaler Application Delivery Controller (ADC) and Gateway. Citrix is warning customers of a critical vulnerability, tracked as CVE-2023-3519 (CVSS score: 9.8), in NetScaler Application Delivery Controller (ADC) and Gateway that is being actively exploited in the wild. The vulnerability, tracked as CVE-2023-3519 (CVSS score: 9.8), is a code injection that […]