KEV Intelligence

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2025-20352

IOS Denial of Service

Cisco / IOS · 12.2(55)SE

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Severity
CVSS 7.7 · High
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
38.8%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2025-20352 is a vulnerability affecting Cisco IOS and 2 other products. A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow the...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Cisco / IOS 12.2(55)se.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

IOS Denial of Service

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.

Vendor Product Affected Status
Cisco Cisco IOS XE Catalyst SD-WAN 16.9.1 Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.9.2 Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.9.3 Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.9.4 Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.10.1 Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.10.2 Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.10.3 Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.10.3a Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.10.3b Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.10.4 Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.10.5 Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.10.6 Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.11.1a Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.12.1b Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.12.1d Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.12.1e Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.12.2r Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.12.3 Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.12.4 Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.12.4a Affected
Cisco Cisco IOS XE Catalyst SD-WAN 16.12.5 Affected
Published
24 Sep 2025
Exploitation Reported
01 Jun 2026
Attack vector
Remote
Complexity
Low
Privileges
Low
User interaction
None

Tags

cisa ios edge

CVE References

  • CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2025-20352
  • cisco-sa-snmp-x4LPhte sec.cloudapps.cisco.com · CVE Record https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurity...

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 01 Jun 2026

Independent exploitation attestation added to the KEV Intelligence record.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source Added
CVE First 2026-06-01 10:41 UTC
CISA 2026-06-02 14:05 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
0
User-Agents
0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.7 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

EPSS

38.8%

Weaknesses

Stack-based Buffer Overflow CWE-121

Timeline

From disclosure to observed exploitation

  1. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  2. Added to KEV Intelligence KEV Feed

    High-confidence, third-party attested exploitation

  3. CVE published

    Vulnerability disclosed publicly

  4. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2025-20352

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2025-20352",
  "confidence": "Confirmed",
  "cvss_score": 7.7,
  "cvss_estimated": false,
  "epss_score": 0.38754,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

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