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A vulnerability in the Network-Based Application Recognition (NBAR) feature of Cisco IOS XE Software allows unauthenticated, remote attackers to cause affected devices to reload, resulting in a denial of service condition. The flaw arises from improper handling of malformed Control and Provisioning of Wireless Access Points (CAPWAP) packets, which can be exploited by sending specially crafted packets through the device. Cisco has released software updates to address this vulnerability, but no workarounds are available. The vulnerability is tracked as CVE-2025-20315 and has a CVSS score of 8.6.
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Cisco published a security advisory for a denial-of-service vulnerability in Cisco IOS XE Software involving Network-Based Application Recognition (NBAR). The same issue was identified as CVE-2025-20315 and described as affecting NBAR CAPWAP processing.
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Cisco disclosed **CVE-2026-20086**, a high-severity denial-of-service vulnerability in **Cisco IOS XE Wireless Controller Software** for the **Catalyst CW9800 Family**. The flaw affects the handling of **Control and Provisioning of Wireless Access Points (CAPWAP)** traffic and stems from improper processing of a malformed CAPWAP packet, mapped to **CWE-230**. An unauthenticated remote attacker can exploit the issue by sending a crafted malformed packet to a vulnerable wireless controller, causing the device to reload unexpectedly and creating a denial-of-service condition. Cisco assigned the issue a **CVSS v3.1** score with vector `AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H`, indicating low-complexity network exploitation with high impact on availability.
Jun 29, 2026
A critical security vulnerability, CVE-2025-20352, has been identified in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE software, affecting a wide range of Cisco networking devices. This stack overflow flaw allows remote attackers with valid SNMP credentials to send specially crafted SNMP packets over IPv4 or IPv6, potentially causing denial-of-service (DoS) by forcing device reloads or, in more severe cases, enabling remote code execution as root. The vulnerability impacts all SNMP versions (v1, v2c, v3) and has been confirmed to affect both legacy and modern modular Cisco operating systems, including Meraki MS390 and Catalyst 9300 Series Switches running Meraki CS 17 and earlier. Reports indicate that up to 2 million devices globally, including those operated by ISPs and cloud providers, are potentially exposed to this vulnerability. The flaw was discovered during a Cisco Technical Assistance Center (TAC) support case and has already been exploited in the wild, prompting its addition to the CISA Known Exploited Vulnerabilities (KEV) catalog on September 29th, 2025. The exploitation of this vulnerability represents a significant escalation, as attackers have demonstrated the ability to gain administrator-level credentials and full device compromise. Rockwell Automation has issued an advisory confirming that its Lifecycle Services, specifically the Industrial Data Center (IDC) with Cisco Switching (Generations 1–5), are affected by this vulnerability. Rockwell has provided guidance on corrected software versions and available workarounds to mitigate the risk. The vulnerability poses a substantial threat to the backbone of enterprise, industrial, and service provider networks, given the widespread deployment of affected Cisco devices. Cisco’s response to the incident was initiated only after evidence of active exploitation emerged, underscoring the urgency of patching and mitigation. Organizations are strongly advised to update to the corrected Cisco software versions as soon as possible and to implement any recommended workarounds to reduce exposure. The incident highlights the ongoing risks associated with SNMP-enabled network infrastructure and the importance of credential management and network segmentation. Security teams should prioritize the identification of vulnerable devices and monitor for signs of exploitation. The rapid exploitation and large attack surface associated with CVE-2025-20352 make it a high-priority threat for organizations relying on Cisco networking equipment.
Jun 29, 2026
Cisco disclosed a high-severity zero-day vulnerability, CVE-2025-20352, affecting the SNMP subsystem in IOS and IOS XE software, which is being actively exploited in the wild. The flaw, a stack-based buffer overflow, allows authenticated remote attackers with low privileges to cause denial-of-service conditions, while high-privileged attackers can achieve remote code execution as root on vulnerable IOS XE devices. Cisco confirmed that attackers have exploited this vulnerability after compromising local administrator credentials, highlighting the risk of credential theft and chained attacks. The vulnerability affects all devices with SNMP enabled, including Meraki MS390 and Cisco Catalyst 9300 Series Switches, and impacts all SNMP versions (v1, v2c, v3). Cisco has released security updates and strongly urges customers to upgrade immediately, as no workarounds exist beyond restricting SNMP access to trusted users.
Jun 29, 2026