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How the CVE Works
The vulnerability stems from improper storage of SNMPv3 configuration in Cisco IOS/IOS XE startup configurations. Even when SNMPv3 usernames are removed or access is explicitly denied, the device may still respond to SNMP queries from unauthorized sources if the attacker has valid credentials. This occurs due to residual configuration data remaining in memory. An authenticated attacker can exploit this by sending SNMP requests from a blocked IP, bypassing intended restrictions and performing unauthorized SNMP operations.
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Platform: Cisco IOS/IOS XE
Version: Multiple (SNMPv3-enabled)
Vulnerability: Authentication Bypass
Severity: Medium
Date: 08/05/2025
Prediction: Patch expected by 10/2025
What Undercode Say
Analytics:
show running-config | include snmp debug snmp packets
Exploit:
import pysnmp
target = "192.168.1.1"
snmp_query = getCmd(SnmpEngine(), UsmUserData('valid_user'), UdpTransportTarget((target, 161)))
Protection from this CVE
- Disable SNMPv3 if unused.
- Apply Cisco’s upcoming patch.
- Monitor SNMP traffic logs.
Impact:
Unauthorized SNMP data access, potential configuration leaks.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
