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Cisco IOS and IOS XE SNMP Zero-Day Exploited in Attacks

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Cisco has released security updates to address a high-severity zero-day vulnerability (CVE-2025-20352) in Cisco IOS and IOS XE Software. The flaw is a stack-based buffer overflow in the Simple Network Management Protocol (SNMP) subsystem, actively exploited in attacks. This vulnerability allows authenticated, remote attackers to cause denial-of-service (DoS) conditions or gain root control of affected systems. The vulnerability impacts all devices with SNMP enabled, including specific Cisco devices running Meraki CS 17 and earlier. Cisco advises customers to upgrade to a fixed software release, specifically Cisco IOS XE Software Release 17.15.4a, to remediate the vulnerability. Temporary mitigation involves limiting SNMP access to trusted users and disabling the affected Object Identifiers (OIDs) on devices. Additionally, Cisco patched 13 other security vulnerabilities, including two with available proof-of-concept exploit code. Cisco also released patches for 14 vulnerabilities in IOS and IOS XE, including eight high-severity vulnerabilities. Proof-of-concept exploit code exists for two of the vulnerabilities, but exploitation is not confirmed. Three additional medium-severity bugs affect Cisco’s SD-WAN vEdge, Access Point, and Wireless Access Point (AP) software.

Timeline

  1. 24.09.2025 19:52 3 articles · 5d ago

    Cisco IOS and IOS XE SNMP Zero-Day Exploited in Attacks

    The flaw allows attackers with low privileges to cause a denial-of-service (DoS) condition. High-privileged attackers can exploit the flaw to execute arbitrary code remotely as the root user. The flaw is exploited by sending crafted SNMP packets to a vulnerable router or switch. The flaw affects Meraki MS390 and Catalyst 9300 series switches running Meraki CS 17 and earlier releases. Cisco released patches for 14 vulnerabilities in IOS and IOS XE, including eight high-severity vulnerabilities. Proof-of-concept exploit code exists for two of the vulnerabilities, but exploitation is not confirmed. Three additional medium-severity bugs affect Cisco’s SD-WAN vEdge, Access Point, and Wireless Access Point (AP) software.

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