⚠ Actively exploited
Added to CISA KEV on 2025-09-29. Federal agencies required to patch by 2025-10-20. 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..

CVE-2025-20352

CWE-121 — Stack-based Buffer Overflow14 documents8 sources
Severity
7.7HIGH
EPSS
2.7%
top 14.17%
CISA KEV
KEV
Added 2025-09-29
Due 2025-10-20
Exploit
No known exploits
Affected products
5
Cisco Cisco IOS XE Catalyst Sd-wanCisco Cisco IOS XE SoftwareCisco IOS+2 more
Timeline
PublishedSep 24
KEV addedSep 29
Latest updateOct 16
KEV dueOct 20
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.

Description

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 h…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:HExploitability: 3.1 | Impact: 4.0

Affected Packages6 packages

▶CVEListV5cisco/cisco_ios_xe_software349 versions+348
▶CVEListV5cisco/ios726 versions+725
▶NVDcisco/ios726 versions+725
▶NVDcisco/ios_xe349 versions+348
▶NVDcisco/ios_xe_sd-wan21 versions+20

🔴Vulnerability Details

3
CVEList
CVE-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:↗2025-09-24
▶
GHSA
GHSA-c924-mch4-p3p3: A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow the following:↗2025-09-24
▶
VulnCheck
Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability↗2025
▶

📋Vendor Advisories

2
CISA
Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability↗2025-09-29
▶
Cisco
Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability↗2025-09-24
▶

🕵️Threat Intelligence

8
Bleepingcomputer
Hackers exploit Cisco SNMP flaw to deploy rootkit on switches↗2025-10-16
▶
Trendmicro
Operation Zero Disco: Attackers Exploit Cisco SNMP Vulnerability to Deploy Rootkits↗2025-10-15
▶
Trendmicro
Operation Zero Disco: Attackers Exploit Cisco SNMP Vulnerability to Deploy Rootkits↗2025-10-15
▶
Trendmicro
Operation Zero Disco: Attackers Exploit Cisco SNMP Vulnerability to Deploy Rootkits↗2025-10-15
▶
Trendmicro
Operation Zero Disco: Attackers Exploit Cisco SNMP Vulnerability to Deploy Rootkits↗2025-10-15
▶
CVE-2025-20352 (HIGH CVSS 7.7) | A vulnerability in the Simple Netwo | cvebase.io