VulnHub

Cisco has been targeted in a cyberattack that resulted in the theft of source code from its internal development environment. This breach was made possible through the use of stolen credentials linked to a prior supply chain attack on Trivy, a tool used for scanning container vulnerabilities. The attackers gained access to sensitive source code belonging not only to Cisco but also to its customers, raising serious concerns about the security of their products and services. This incident emphasizes the risks associated with credential theft and the potential for significant impacts on a wide range of users who rely on Cisco's technology. Companies should assess their security protocols to prevent similar breaches in the future.

The Interlock ransomware group has been exploiting a severe zero-day vulnerability in Cisco Secure Firewall Management Center software, identified as CVE-2026-20131, since January 26, prior to its public disclosure. This vulnerability allows for insecure deserialization, which can lead to unauthorized access and potential takeover of affected systems. Organizations using Cisco's Secure Firewall Management Center should be particularly vigilant, as the attacks have been ongoing for over a month, posing a significant risk to network security. The situation emphasizes the urgent need for timely security updates and monitoring to protect against such exploitation.

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has alerted government agencies about two significant security vulnerabilities affecting the Synacor Zimbra Collaboration Suite (ZCS) and Microsoft Office SharePoint. Both flaws, identified as CVE-2025-66376 and another not specified in the article, have been found to be actively exploited by attackers. The CVE-2025-66376 vulnerability has a CVSS score of 7.2, indicating a moderate to high risk. Organizations using these platforms are urged to apply the necessary patches to protect against potential attacks. The exploitation of these vulnerabilities underscores the need for timely updates and vigilance in cybersecurity practices, especially for government entities.

A significant vulnerability in Cisco's Catalyst SD-WAN, identified as CVE-2026-20133, poses a serious risk that some organizations may be overlooking. Cybersecurity experts have expressed concern that security teams are focusing their attention on another vulnerability, CVE-2026-20127, which is a zero-day exploit. This could lead to a dangerous situation where the high-severity flaw is not addressed, leaving systems vulnerable to potential attacks. Organizations using Cisco SD-WAN products should be aware of this oversight, as failing to remediate the CVE-2026-20133 vulnerability could expose critical data and systems to exploitation. The urgency of addressing this issue cannot be overstated, especially as cyber threats continue to evolve rapidly.

The Interlock ransomware gang has been actively exploiting a serious remote code execution vulnerability in Cisco's Secure Firewall Management Center (FMC) software since late January. This flaw, classified as having maximum severity, allows attackers to execute arbitrary code on affected systems, putting organizations at significant risk. Companies using this software should be particularly vigilant, as the vulnerability is being exploited in ongoing attacks. Cisco has not yet released a patch to address this issue, which raises concerns about the potential for widespread impact. Organizations relying on Cisco FMC should prioritize security measures and closely monitor any unusual activity to safeguard their networks.

Amazon Threat Intelligence has issued a warning regarding an active ransomware campaign known as Interlock, which is exploiting a significant vulnerability in Cisco's Secure Firewall Management Center (FMC) Software. This vulnerability, identified as CVE-2026-20131, has a maximum severity score of 10.0 and stems from an insecure deserialization of user-supplied Java byte streams. This flaw could allow attackers to gain root access without authentication, posing a serious risk to organizations using affected Cisco products. The exploitation of this vulnerability is concerning as it enables unauthorized access, potentially leading to data breaches and system compromises. Companies using Cisco FMC Software must take immediate action to protect their systems from this ongoing threat.

Cisco has addressed 50 vulnerabilities in its firewall products, with two of them rated as critical, scoring a 10 out of 10 on the CVSS scale. These vulnerabilities could potentially allow attackers to exploit the system and gain unauthorized access. Organizations using Cisco firewall products are urged to apply the patches as soon as possible to mitigate the risks. Failure to address these vulnerabilities could lead to significant security breaches, putting sensitive data at risk. This incident emphasizes the ongoing need for vigilance in cybersecurity practices and timely updates to software.

Cisco has confirmed that two vulnerabilities in the Catalyst SD-WAN Manager are currently being exploited by attackers. The first vulnerability, identified as CVE-2026-20122, has a CVSS score of 7.1 and allows authenticated remote users to overwrite files on the local file system. This could lead to significant disruptions and unauthorized access to sensitive data. Organizations using the Catalyst SD-WAN Manager should take immediate action to address these vulnerabilities, as they pose a serious risk to network security. It’s crucial for affected users to monitor their systems closely and apply any available patches as soon as possible.

A new threat actor known as UAT-9921 has been targeting the technology and financial services sectors using a malware framework called VoidLink. Cisco Talos researchers discovered that UAT-9921 has been active since at least 2019, though this is the first time they have employed VoidLink in their attacks. The malware's modular design suggests it can be adapted for various purposes, raising concerns about its potential to evolve and impact a wide range of systems within these industries. Companies in the tech and finance sectors should be vigilant and enhance their security measures to defend against this emerging threat. The situation highlights the ongoing challenges organizations face in protecting sensitive information from sophisticated cyber attacks.

Researchers at Cisco Talos have identified a toolkit called DKnife that has been in use since 2019 to hijack router traffic for cyber-espionage purposes. This Linux-based toolkit allows attackers to inspect and alter data as it travels through routers and edge devices. It can also install malware on various devices, including PCs and smartphones. The implications of this toolkit are significant, as it poses a threat to the confidentiality and integrity of sensitive data transmitted over networks. Users and organizations relying on affected routers should be particularly vigilant about their network security practices to mitigate potential risks.

In its latest report, Cisco Talos revealed that nearly 40% of cyber intrusions in the fourth quarter of 2025 were due to exploited vulnerabilities. This statistic highlights a significant trend in cyberattacks, where attackers are increasingly taking advantage of weaknesses in software and systems. Organizations across various sectors need to be vigilant, as these vulnerabilities can lead to serious breaches and data loss. The findings stress the importance of regular software updates and security patches to mitigate these risks. As cyber threats continue to evolve, staying informed about potential vulnerabilities is crucial for any organization aiming to protect its data and systems.

Cisco has addressed a serious security flaw in its Unified Communications and Webex Calling platforms, identified as CVE-2026-20045. This vulnerability allows attackers to execute arbitrary commands remotely without authentication, posing a significant risk to users. The flaw has been actively exploited in the wild, which raises concerns for organizations relying on these communication tools. With a CVSS score of 8.2, it is classified as critical, emphasizing the urgency for users to apply the available patches. Companies utilizing Cisco's services should prioritize updating their systems to mitigate potential attacks.

Cisco has addressed a serious vulnerability in its Unified Communications and Webex Calling platforms, identified as CVE-2026-20045. This remote code execution flaw was found to be actively exploited by attackers, posing a significant risk to users. The vulnerability could allow unauthorized access to systems, potentially leading to data breaches or service disruptions. Organizations using these Cisco products are urged to apply the latest updates to mitigate the risk. This incident underscores the importance of timely patch management in maintaining cybersecurity hygiene.

Cisco has addressed a serious flaw in its Secure Email products, which was exploited by a China-linked hacking group known as UAT-9686. The vulnerability, tracked as CVE-2025-20393, has a maximum severity score of 10.0 and affects the Secure Email Gateway and Email and Web Manager. Attackers were able to exploit this flaw as a zero-day, meaning it was actively used in attacks before a patch was made available. It's crucial for users of these products to apply the latest updates to protect their systems from potential exploitation. This incident highlights the ongoing risks posed by advanced persistent threat groups targeting widely used software.