Cybersecurity researchers at GreyNoise have uncovered widespread exploitation of a critical zero-day vulnerability in Zyxel CPE Series devices, months after it was initially reported to the manufacturer. The flaw, identified as CVE-2024-40891, allows attackers to execute arbitrary commands on affected devices, potentially leading to data breaches, network infiltration, and complete system compromise. GreyNoise has disclosed the issue to raise awareness among organizations and individuals at risk, as mass exploitation attempts have already been observed.
The vulnerability, CVE-2024-40891, was first reported to Zyxel by researchers at VulnCheck in August 2024. However, Zyxel has yet to release a public advisory or an official CVE entry for the flaw, leaving users without a patch to mitigate the risk. GreyNoise collaborated with VulnCheck to disclose the issue, following standard security policies. A GreyNoise spokesperson stated, “Due to first-hand, confirmed mass exploitation attempts for this vulnerability, we chose to disclose this to raise awareness among those who may be impacted.”
Security analysts at Censys estimate that approximately 1,500 devices are online and potentially vulnerable, though definitive confirmation of affected versions is still pending. The National Vulnerability Database (NVD) has not yet provided additional details about the issue. To assess the extent of malicious activity, GreyNoise and VulnCheck conducted a joint investigation, revealing that attackers are actively targeting the flaw.
Researchers noted that CVE-2024-40891 shares similarities with another Zyxel vulnerability, CVE-2024-40890, which also involves authentication and command injection exploits. The key difference is that CVE-2024-40891 is exploited via telnet, while CVE-2024-40890 is HTTP-based. This latest vulnerability follows a recent warning from the Cybersecurity and Infrastructure Security Agency (CISA) and German authorities about another security flaw in Zyxel firewalls, CVE-2024-11667, which was exploited to deploy Helldown ransomware in early December.
With no official patch available, Zyxel users remain vulnerable to exploitation. Security experts urge organizations to implement temporary mitigation strategies to reduce the risk of compromise. Key recommendations include:
A VulnCheck spokesperson confirmed that the firm is actively working with Zyxel on the disclosure process and expects to share further insights in the coming week. In the meantime, organizations are advised to remain vigilant and take proactive steps to protect their networks.
The widespread exploitation of CVE-2024-40891 highlights the critical importance of timely vulnerability disclosure and patch management. As attackers continue to target Zyxel devices, organizations must prioritize cybersecurity measures to safeguard their systems and data. While waiting for an official patch, implementing temporary mitigation strategies and staying informed about updates can help reduce the risk of exploitation. This incident serves as a reminder of the ongoing challenges in securing network devices and the need for collaboration between manufacturers, researchers, and users to address vulnerabilities effectively.
Cryptojacking, the unauthorized exploitation of an organization’s computing resources to mine cryptocurrency, has emerged as a significant yet often overlooked cybersecurity threat. Unlike ransomware, which overtly disrupts operations, cryptojacking operates covertly, leading to substantial financial and operational impacts. In 2023, cryptojacking attacks surged by 659%, totaling 1.1 billion incidents, according to SonicWall’s 2024 Cyber Threat Report.
This dramatic increase underscores the growing appeal of cryptojacking among cybercriminals. The financial implications for businesses are severe. Research indicates that for every dollar’s worth of cryptocurrency mined illicitly, companies incur approximately USD 53 in cloud service costs. This disparity highlights the hidden expenses organizations face when their systems are compromised for unauthorized mining activities.
Attackers employ various methods to infiltrate systems, including:
The rise of containerized environments has also provided new avenues for attackers. For example, cybercriminals can embed mining scripts within public repository images or target exposed Docker APIs to deploy cryptojacking malware.
Beyond financial losses, cryptojacking degrades system performance by overutilizing CPU and GPU resources. This leads to slower operations, reduced productivity, and increased energy consumption. Over time, the strain on hardware can cause overheating and potential equipment failure. Additionally, compromised systems are more vulnerable to further security breaches, as attackers can leverage their access to escalate attacks.
To defend against cryptojacking, organizations must implement proactive security measures. Key strategies include:
Organizations should also prioritize employee training to recognize phishing attempts and other common attack vectors. Regularly updating and patching software can close vulnerabilities that attackers exploit to infiltrate systems. Additionally, implementing robust access controls and monitoring for unusual user activity can help prevent unauthorized access.
The surge in cryptojacking attacks highlights the growing sophistication of cybercriminals and the need for organizations to adopt comprehensive cybersecurity measures. While cryptojacking may not be as visibly disruptive as ransomware, its financial and operational impacts can be equally devastating. By deploying advanced detection tools, analyzing network traffic, and regularly testing defenses, businesses can mitigate the risks posed by cryptojacking and protect their computing resources from unauthorized exploitation. As cyber threats continue to evolve, proactive and adaptive security strategies will be essential to safeguarding organizational assets and maintaining operational efficiency.
Generative AI (GenAI) is transforming the cybersecurity landscape, with 52% of CISOs prioritizing innovation using emerging technologies. However, a significant disconnect exists, as only 33% of board members view these technologies as a top priority. This gap underscores the challenge of aligning strategic priorities between cybersecurity leaders and company boards.
According to the latest Splunk CISO Report, cyberattacks are becoming more frequent and sophisticated. Yet, 41% of security leaders believe that the requirements for protection are becoming easier to manage, thanks to advancements in AI. Many CISOs are increasingly relying on AI to:
However, GenAI is a double-edged sword. While it enhances threat detection and protection, attackers are also leveraging AI to boost their efforts. For instance:
This has led to growing concerns among security professionals, with 36% of CISOs citing AI-powered attacks as their biggest worry, followed by cyber extortion (24%) and data breaches (23%).
One of the major challenges is the gap in budget expectations. Only 29% of CISOs feel they have sufficient funding to secure their organizations, compared to 41% of board members who believe their budgets are adequate. Additionally, 64% of CISOs attribute the cyberattacks their firms experience to a lack of support.
Despite these challenges, there is hope. A vast majority of cybersecurity experts (86%) believe that AI can help attract entry-level talent to address the skills shortage, while 65% say AI enables seasoned professionals to work more productively. Collaboration between security teams and other departments is also improving:
To strengthen cyber defenses, experts emphasize the importance of foundational practices:
Generative AI is reshaping the cybersecurity landscape, offering both opportunities and challenges. While it enhances threat detection and operational efficiency, it also empowers attackers to launch more sophisticated and frequent attacks. To navigate this evolving landscape, organizations must align strategic priorities, invest in AI-driven solutions, and reinforce foundational cybersecurity practices. By doing so, they can better protect their systems and data in an increasingly complex threat environment.