CVE intelligence and bounded remediation

CVE-2025-20352 — Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability

High CVSS 7.7 CISA KEV

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-priv…

Severity
High
CVSS
7.7 (3.1)
Published
2025-09-24
CISA KEV
Known exploited
Ecosystem
operating-system
Weaknesses
CWE-121

Affected products

  • cisco / ios_xe_sd-wan / 16.9.1
  • cisco / ios_xe_sd-wan / 16.9.2
  • cisco / ios_xe_sd-wan / 16.9.3
  • cisco / ios_xe_sd-wan / 16.9.4
  • cisco / ios_xe_sd-wan / 16.10.1
  • cisco / ios_xe_sd-wan / 16.10.2

Showing 6 representative product identities from 1096 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Buffer bounds, memory safety, and memory corruption

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Check exposure

  • Identify affected native-code versions, build flags, architectures, parsers, codecs, drivers, and input paths in all shipped artifacts.
  • Determine whether untrusted data reaches the affected routine and the process privilege, sandbox, and network exposure.
  • Confirm statically linked, vendored, firmware, and platform-provided copies, not only package-manager records.

Remediate safely

  • Apply the maintained upstream correction or replace the affected component, then rebuild every dependent artifact from clean inputs.
  • Adopt bounds-checked interfaces, validated sizes and integer conversions, clear ownership, and memory-safe components where practical.
  • Enable supported compiler and runtime hardening and add sanitized tests and fuzz regression seeds derived from non-weaponized fixtures.

Authoritative sources

Complete CVE record and remediation plan

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