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Vulnerabilities/CVE-2025-20352Public Intelligence Dossier
Source: cisco · Limited verification•Last verified: •Collection Degraded
CVE-2025-20352ListedHIGH (raw)CVSS 7.7CWE-121

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

Published: 24 Sept 2025•Last updated: 26 Sept 2026, 05:40 AM IST•Source identifier: psirt@cisco.com
Dossier completeness: source-provided sections 3 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Listed
Added29 Sept 2025
Due20 Oct 2025
RansomwareUnknown
CVSS score
7.7HIGH (raw)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Metric sourcepsirt@cisco.com
EPSS probability
40.6%0.406
Percentile99th
Weakness type
CWE-121
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

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.

SOC priority

Immediate Attention

Actively exploited (source statement)

Yes

Publicly disclosed

Unknown

Risk basis: CISA KEV exploitation signal; SOC ecosystem technology relevance; HIGH severity; Known exploitation signal from CISA KEV or ransomware metadata; Source-confirmed exploitation or CISA KEV/ransomware metadata

Affected Products & Remediation

2 source-backed products
Affected products and versions (source)
  • cisco ios xe sd-wan · 16.9.1; 16.9.2; 16.9.3; 16.9.4; 16.10.1; 16.10.2; 16.10.3; 16.10.3a; 16.10.3b; 16.10.4; 16.10.5; 16.10.6; 16.11.1a; 16.12.1b; 16.12.1d; 16.12.1e; 16.12.2r; 16.12.3; 16.12.4; 16.12.4a; 16.12.5 · NVD CPE · Source
  • cisco ios xe · sd-wan 16.9.1; sd-wan 16.9.2; sd-wan 16.9.3; sd-wan 16.9.4; sd-wan 16.10.1; sd-wan 16.10.2; sd-wan 16.10.3; sd-wan 16.10.3a; sd-wan 16.10.3b; sd-wan 16.10.4; sd-wan 16.10.5; sd-wan 16.10.6; sd-wan 16.11.1a; sd-wan 16.12.1b; sd-wan 16.12.1d; sd-wan 16.12.1e; sd-wan 16.12.2r; sd-wan 16.12.3; sd-wan 16.12.4; sd-wan 16.12.4a; sd-wan 16.12.5; 3.5.0e; 3.5.0sq; 3.5.1e; 3.5.1sq; 3.5.2e; 3.5.2sq; 3.5.3e; 3.5.3sq; 3.5.4sq; 3.5.5sq; 3.5.6sq; 3.5.7sq; 3.5.8sq; 3.6.0e; 3.6.1e; 3.6.2ae; 3.6.2e; 3.6.3e; 3.6.4e · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

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

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Listed
Exploited (source statement)
Yes
Publicly disclosed (source)
Unknown

CISA 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.

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched kev-network-exposure (CVSS AV:N, CISA KEV Listed)

Exposure

  1. Identify assets with the exact CVE and confirm the affected product/version against the advisory.Telemetry: DeviceTvmSoftwareVulnerabilities · KEV listing raises urgency, but inventory is needed to establish local exposure. · Rule kev-network-exposure

Exploitation evidence

  1. Review relevant edge or application access logs for unusual requests around the advisory window.Telemetry: CommonSecurityLog · Log review is a hunting hypothesis; KEV listing alone does not show local exploitation. · Rule kev-network-exposure

Response

  1. Recheck the affected assets after the source-stated mitigation or update is applied.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies local remediation. · Rule kev-network-exposure

CISA KEV Record

Catalog entry
29 Sept 2025
Required action due
20 Oct 2025
Known ransomware use
Unknown

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

Change History & Source Data

— No recorded material change

CNA / source
psirt@cisco.com
Record status · verification
UPDATED · CISA KEV confirmed
CPE
cpe:2.3:o:cisco:ios_xe_sd-wan:16.9.1:*:*:*:*:*:*:*, cpe:2.3:o:cisco:ios_xe_sd-wan:16.9.2:*:*:*:*:*:*:*, cpe:2.3:o:cisco:ios_xe_sd-wan:16.9.3:*:*:*:*:*:*:*, cpe:2.3:o:cisco:ios_xe_sd-wan:16.9.4:*:*:*:*:*:*:*, cpe:2.3:o:cisco:ios_xe_sd-wan:16.10.1:*:*:*:*:*:*:*, cpe:2.3:o:cisco:ios_xe_sd-wan:16.10.2:*:*:*:*:*:*:*, cpe:2.3:o:cisco:ios_xe_sd-wan:16.10.3:*:*:*:*:*:*:*, cpe:2.3:o:cisco:ios_xe_sd-wan:16.10.3a:*:*:*:*:*:*:*, cpe:2.3:o:cisco:ios_xe_sd-wan:16.10.3b:*:*:*:*:*:*:*, cpe:2.3:o:cisco:ios_xe_sd-wan:16.10.4:*:*:*:*:*:*:*

Evidence & Provenance

4 public sources
CISA KEV CatalogAdded 2025-09-29sec.cloudapps.cisco.comSource recordnvd.nist.govSource recordcisa.govSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2025-20352
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2025-20352
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2025-20352"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

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Correlated briefings

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.