ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2025-20352

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

Published Sep 24, 2025 · catalog updated Sep 25, 2026 · Cisco IOS and IOS XE

Patch now

CVE-2025-20352 is in the CISA known-exploited catalog, due Oct 20, 2025. Confirm Cisco IOS and IOS XE against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
High7.7
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
40.17%
Remediation
Remediation guidance
Affected products
cpe cisco/ios · cpe cisco/ios xe · cpe cisco/ios xe sd-wan · vendor Cisco IOS and IOS XE

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • 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

How to fix CVE-2025-20352

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-20352 is in the CISA known-exploited catalog, due Oct 20, 2025. Confirm Cisco IOS and IOS XE against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with cisco/ios xe 3.5.0e; cisco/ios xe sd-wan 16.10.1; cisco/ios xe sd-wan 16.10.2; cisco/ios xe sd-wan 16.10.3. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What should an analyst verify?

CWE-121: Stack-based Buffer Overflow. EPSS 40.17%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

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

Sources

  • CISA KEVConfirmed exploitationCVE-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.orgVulnerability recordCVE-2025-20352

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-20352

    30-day exploitation probability 40.2%

    first.org
  • NIST NVDVulnerability recordCVE-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
  • VulnCheck KEVConfirmed exploitationCVE-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 s

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.