CVE-2025-20352A 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 privil…
Updated under an hour ago ()
Does this affect you?
It affects Cisco IOS and 4 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Sep 29, 2025; federal agencies had to remediate by Oct 20, 2025. Treat that date as your deadline.
Do this next
Free account, 1 product
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.
- CVSS
- 7.7 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- Weakness (CWE)
- CWE-121
- Known exploited
- Added to CISA KEV Sep 29, 2025; federal remediation due Oct 20, 2025Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 40.17% (percentile 99)
- Assigned by
- cisco
- NVD analysis
- Analyzed
- Record last updated
- Feb 26, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Cisco IOS cisco:ios (from the name) | 12.2(55)SE; 12.2(55)SE3; 12.2(55)SE2; 12.2(58)SE; 12.2(55)SE1; 12.2(58)SE1; 12.2(55)SE4; 12.2(58)SE2; and 193 more ranges | CNA record |
Cisco Cisco IOS XE Software cisco:ios_xe_software (from the name) | 3.5.0E; 3.5.1E; 3.5.2E; 3.5.3E; 3.6.0E; 3.6.1E; 3.6.2aE; 3.6.2E; and 193 more ranges | CNA record |
Cisco Cisco IOS XE Catalyst SD-WAN cisco:ios_xe_catalyst_sd_wan (from the name) | 16.9.1; 16.9.2; 16.9.3; 16.9.4; 16.10.1; 16.10.2; 16.10.3; 16.10.3a; and 13 more ranges | CNA record |
cisco ios_xe_sd-wan 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; and 13 more ranges | NVD |
cisco ios_xe cisco:ios_xe | 3.5.0e; 3.5.0sq; 3.5.1e; 3.5.1sq; 3.5.2e; 3.5.2sq; 3.5.3e; 3.5.3sq; and 193 more ranges | NVD |
cisco ios cisco:ios | 12.2(33)sxi; 12.2(33)sxi1; 12.2(33)sxi2; 12.2(33)sxi2a; 12.2(33)sxi3; 12.2(33)sxi4; 12.2(33)sxi4a; 12.2(33)sxi5; and 193 more ranges | NVD |
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmp-x4LPhtemitigation, vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20352us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.