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...
Vulnerability report
Exploited in the wild
Confirmed confidence
In CISA KEV
CVE-2025-20352
IOS Denial of Service
Cisco / IOS · 12.2(55)SE
- 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.
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
IOS
15.6(1)T2
Affected
Cisco
IOS
15.6(2)T2
Affected
Cisco
IOS
15.6(1)T3
Affected
Cisco
IOS
15.6(2)T3
Affected
Cisco
IOS
15.3(3)JNB
Affected
Cisco
IOS
15.3(3)JNB1
Affected
Cisco
IOS
15.3(3)JNB2
Affected
Cisco
IOS
15.3(3)JNB3
Affected
Cisco
IOS
15.3(3)JNB4
Affected
Cisco
IOS
15.3(3)JNB6
Affected
Cisco
IOS
15.3(3)JNB5
Affected
Cisco
IOS
15.3(3)JAX
Affected
Cisco
IOS
15.3(3)JAX1
Affected
Cisco
IOS
15.3(3)JAX2
Affected
Cisco
IOS
15.3(3)JBB
Affected
Cisco
IOS
15.3(3)JBB1
Affected
Cisco
IOS
15.3(3)JBB2
Affected
Cisco
IOS
15.3(3)JBB4
Affected
Cisco
IOS
15.3(3)JBB5
Affected
Cisco
IOS
15.3(3)JBB6
Affected
Cisco
IOS
15.3(3)JBB8
Affected
Cisco
IOS
15.3(3)JBB6a
Affected
Cisco
IOS
15.3(3)JC
Affected
Cisco
IOS
15.3(3)JC1
Affected
Cisco
IOS
15.3(3)JC2
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
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.
Learn about Pro API access| 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
Timeline
From disclosure to observed exploitation
-
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
Added to KEV Intelligence KEV Feed
High-confidence, third-party attested exploitation
-
CVE published
Vulnerability disclosed publicly
-
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.
- 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 }
}Early warning alerts
Get alerts on high-impact exploitation
Receive curator-selected alerts when exploitation activity warrants attention. Each alert includes the evidence and context needed to decide what requires attention now.