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Critical Cisco IOS and IOS XE Flaws Allow Remote Code Execution

Cisco has identified a significant security vulnerability within its IOS and IOS XE Software, which may allow attackers to execute remote code or cause affected devices to crash.

JBy Joseph CainOct 17, 20252 min read

Cisco has identified a significant security vulnerability within its IOS and IOS XE Software, which may allow attackers to execute remote code or cause affected devices to crash.

The vulnerability, designated as CVE-2025-20352 , is located in the Simple Network Management Protocol (SNMP) subsystem and has been assigned a CVSS score of 7.7, indicating a high-severity threat.

This vulnerability originates from a stack overflow condition in the SNMP subsystem that processes network management traffic. It poses a dual threat, allowing attackers with low-level privileges to trigger a denial of service, which forces affected devices to reload and disrupts network operations.

CVE ID CVSS 3.1 Score CWE Impact

CVE-2025-20352 7.7 (High) CWE-121 (Stack-based Buffer Overflow) Denial of Service (DoS) or Remote Code Execution (RCE)

This vulnerability originates from a stack overflow condition in the SNMP subsystem that processes network management traffic.
Joseph Cain · Thehackingpost

Attackers with high-level administrative access can exploit the same vulnerability to execute arbitrary code with root privileges, potentially gaining full control over the compromised system.

Exploitation requires an attacker to send a specially crafted SNMP packet to the target device over IPv4 or IPv6 networks. The attack necessitates either SNMPv2c or earlier read-only community strings or valid SNMPv3 user credentials. For remote code execution, administrative or privilege 15 credentials are also required.

All versions of SNMP are affected, making it a widespread issue for organizations utilizing Cisco networking equipment. Devices running vulnerable releases of IOS Software or IOS XE Software with SNMP enabled are susceptible. Devices with SNMPv1, v2c, or v3 enabled should be considered at risk unless the affected object identifier is explicitly excluded.

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Cisco's IOS XR Software and NX-OS Software products are not affected by this issue. Cisco has issued software updates that address the vulnerability, and organizations are urged to upgrade immediately. Although no complete workarounds exist, temporary mitigation measures include restricting SNMP access to trusted users only and disabling affected object identifiers through specific configuration commands, which may impact device management capabilities.

The vulnerability was published on September 24, 2025, as part of Cisco’s semiannual security advisory. Organizations can use Cisco’s Software Checker tool to identify affected releases and determine appropriate fixed software versions for their deployments.

Based on reporting by GBHackers.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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