All news with #denial of service tag

⚠️ CISA published an advisory for OpenPLC_V3 describing a denial-of-service vulnerability (CVE-2025-54811) caused by a missing return in the enipThread function that can trigger an illegal instruction and crash the PLC runtime. The flaw affects versions prior to pull request #292 and can stop PLCs under certain conditions. A patch is available in PR #292; administrators should update and isolate affected devices.

⚠️ Cisco has warned of a stack overflow vulnerability in the SNMP subsystem of IOS and IOS XE software identified as CVE-2025-20352. A low-privileged authenticated attacker can send a crafted SNMP packet to cause a system reload and a denial-of-service, while a high-privileged actor could achieve root-level arbitrary code execution. Administrators are urged to apply vendor patches immediately and restrict SNMP access until systems are updated.

⚠️ CISA advises that a denial-of-service vulnerability (CVE-2025-8531) affects Mitsubishi Electric MELSEC-Q Series CPU modules when the user authentication function is enabled, due to improper handling of a length parameter (CWE-130). The issue has a CVSS v3.1 base score of 6.8 (AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H) and is exploitable remotely but characterized by high attack complexity. Mitsubishi has identified fixed units with serial ranges beginning '27082' or later and recommends migrating to the successor MELSEC iQ-R Series where updates are unavailable; organizations should apply network-access restrictions and defense-in-depth mitigations.

🔔 A vulnerability in Westermo WeOS 5 when IPSec is enabled can allow a specially crafted ESP packet to trigger an immediate device reboot. Westermo reported the flaw and released WeOS 5 version 5.24.0 to address the issue. CISA rates the vulnerability as remotely exploitable with a CVSS v4 score of 8.2 and notes high attack complexity.

🔒 CISA republished an advisory describing a Siemens-reported OpenSSL bug (CVE-2022-0778) that can cause an infinite loop during certificate parsing in many Siemens products. The issue affects multiple product families and has a CVSS v3.1 base score of 7.5, allowing remote denial-of-service with low attack complexity. Siemens has published firmware and software updates and recommends applying vendor updates, restricting network access to affected interfaces, and following product hardening guidance where fixes are not yet available.

🔔 Siemens ProductCERT and CISA report multiple integer overflow vulnerabilities (CVE-2021-41990, CVE-2021-41991) affecting a broad set of SIMATIC NET CP, SINEMA and SCALANCE devices. Exploitation can cause denial-of-service by triggering integer wraparound; remote code execution is considered unlikely. Siemens provides firmware fixes and workarounds; operators should apply vendor updates, restrict network exposure and follow Siemens operational security guidance.

⚠️ Hitachi Energy reported multiple vulnerabilities in the RTU500 series including null pointer dereference, XML parser flaws, heap and stack buffer overflows, integer overflow, and IEC 61850 message validation errors. Several CVEs have been assigned (e.g., CVE-2023-2953, CVE-2024-45490–45492, CVE-2024-28757, CVE-2025-39203, CVE-2025-6021) and the highest CVSS v4 score is 8.2. Exploitation could cause Denial-of-Service conditions such as device reboots or disconnects. Hitachi Energy provides firmware updates for affected 12.7.x–13.7.x releases and CISA recommends patching, minimizing network exposure, applying segmentation, and using secure remote access.

⚠️ Siemens Industrial Edge Management OS (IEM-OS) contains an allocation-of-resources vulnerability in Apache Commons FileUpload that can be triggered remotely to cause a denial-of-service condition. The issue is tracked as CVE-2025-48976 with a CVSS v4 base score of 8.7 and a CVSS v3.1 vector indicating an availability-only impact. Siemens reports all IEM-OS versions affected and recommends migrating to IEM-V, limiting access to trusted systems, and following Siemens' operational security guidance. CISA reiterates minimizing network exposure, using network segmentation and firewalls, and employing secure remote access methods.

⚠️ CISA published an advisory on two vulnerabilities in Schneider Electric EcoStruxure products that could enable a denial-of-service condition and the exposure of sensitive credentials. The issues are tracked as CVE-2025-8449 (uncontrolled resource consumption) and CVE-2025-8448 (sensitive information exposure). Affected Enterprise Server and Workstation versions should be updated to the fixed releases (for example 7.0.2.348, 6.0.4.10001 (CP8), 5.0.3.17009 (CP16)). If patches cannot be applied immediately, implement strong access controls, network segmentation, MFA where available, and continuous monitoring.

⚠️ A NULL pointer dereference vulnerability (CVE-2025-9166) in Rockwell Automation ControlLogix 5580 version 35.013 can cause the controller to enter a major, nonrecoverable fault resulting in denial of service. CISA reports a CVSS v4 base score of 8.2 and notes remote exploitability with low attack complexity. Rockwell recommends updating to version 35.014 or later and applying security best practices; CISA advises minimizing network exposure, isolating control networks, and using secure remote access methods.

⚠️ Schneider Electric disclosed an Improper Input Validation vulnerability in Modicon M340 controllers and several communication modules that can be triggered by a specially crafted FTP command. Tracked as CVE-2025-6625 with a CVSS v4 base score of 8.7, the flaw enables a remote denial-of-service with low attack complexity. Schneider released firmware fixes for the BMXNOE0100 (v3.60) and BMXNOE0110 (v6.80) modules, which require device reboot; remediation for other affected products is planned. CISA recommends disabling FTP when not needed, blocking or segmenting port 21, using VPNs for remote access, applying vendor updates where available, and following ICS hardening and risk-assessment practices before making changes.

🔒 CISA published Advisory ICSA-25-233-01 on August 21, 2025 describing a Denial-of-Service vulnerability (CVE-2025-5514, CVSS v3 5.3) in the Mitsubishi Electric MELSEC iQ-F Series CPU module web server. An attacker can send specially crafted HTTP requests that exploit an Improper Handling of Length Parameter Inconsistency to delay processing and prevent legitimate users from accessing the web server. Mitsubishi Electric reports no plans to release a fix and advises customers to restrict network exposure, use IP filtering and VPNs, and limit physical access. CISA recommends isolating control networks behind firewalls and minimizing internet exposure.

⚠️ Rockwell Automation has disclosed two improper input validation vulnerabilities in the FLEX 5000 I/O modules (5069-IF8 and 5069-IY8) assigned CVE-2025-7861 and CVE-2025-7862. Successful exploitation can remotely induce a fault state that requires a power cycle to recover, producing a denial-of-service condition. Both issues carry elevated CVSS v4 scores (8.7) and are exploitable with low attack complexity. Rockwell recommends upgrading affected modules to V2.012 or later and following established security best practices.