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CVE-2025-20352

Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability

Published Sep 24, 2025 · updated Sep 25, 2026 · cisco ios xe sd-wan

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow the following: An authenticated, remote attacker with low privileges could cause a denial of service (DoS) condition on an affected device that is running Cisco IOS Software or Cisco IOS XE Software. To cause the DoS, the attacker must have the SNMPv2c or earlier read-only community string or valid SNMPv3 user credentials. An authenticated, remote attacker with high privileges could execute code as the root user on an affected device that is running Cisco IOS XE Software. To execute code as the root user, the attacker must have the SNMPv1 or v2c read-only community string or valid SNMPv3 user credentials and administrative or privilege 15 credentials on the affected device. An attacker could exploit this vulnerability by sending a crafted SNMP packet to an affected device over IPv4 or IPv6 networks. This vulnerability is due to a stack overflow condition in the SNMP subsystem of the affected software. A successful exploit could allow a low-privileged attacker to cause the affected system to reload, resulting in a DoS condition, or allow a high-privileged attacker to execute arbitrary code as the root user and obtain full control of the affected system. Note: This vulnerability affects all versions of SNMP.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 24, 2025 · Catalog

    Detected

    A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow the following: An authenticated, remote attacker with low privileges could cause a denial of service (DoS) condition on an affected device that is running Cisco IOS Software or Cisco IOS XE Software. To cause the DoS, the attacker must have the SNMPv2c or earlier r

  2. Sep 29, 2025 · CISA KEV

    Known exploited

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  3. Oct 20, 2025 · CISA KEV

    Remediation due

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  4. Sep 25, 2026 · Catalog

    Updated

    A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow the following: An authenticated, remote attacker with low privileges could cause a denial of service (DoS) condition on an affected device that is running Cisco IOS Software or Cisco IOS XE Software. To cause the DoS, the attacker must have the SNMPv2c or earlier r

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

CISA due date Oct 20, 2025

Affected

  • cpe cisco/ios12.2\(33\)sxi
  • cpe cisco/ios xe3.5.0e
  • cpe cisco/ios xe sd-wan16.10.1
  • cpe cisco/ios xe sd-wan16.10.2
  • cpe cisco/ios xe sd-wan16.10.3
  • cpe cisco/ios xe sd-wan16.10.3a
  • cpe cisco/ios xe sd-wan16.9.1
  • cpe cisco/ios xe sd-wan16.9.2
  • cpe cisco/ios xe sd-wan16.9.3
  • cpe cisco/ios xe sd-wan16.9.4
  • vendor Cisco IOS and IOS XEversion unspecified

Sources

  • CISA KEVCVE-2025-20352

    Cisco IOS and IOS XE contains a stack-based buffer overflow vulnerability in the Simple Network Management Protocol (SNMP) subsystem that could allow for denial of service or remote code execution. A successful exploit could allow a low-privileged attacker to cause the affected system to reload, resulting in a DoS condition, or allow a high-privileged attacker to execute arbitrary code as the root

    cisa.gov
  • CVE.orgCVE-2025-20352

    Official CVE identifier

    cve.org
  • FIRST EPSSCVE-2025-20352

    30-day exploitation probability 39.4%

    first.org
  • NIST NVDCVE-2025-20352

    A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow the following: An authenticated, remote attacker with low privileges could cause a denial of service (DoS) condition on an affected device t

    nvd.nist.gov

References