CVE-2025-20171
Last modified
CVE-2025-20171 is a high-severity vulnerability rated 7.7/10 on the CVSS scale. A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper error handling when parsing SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affected device. EPSS estimates a 0.72% chance of exploitation in the next 30 days.
Description
A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper error handling when parsing SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition. This vulnerability affects SNMP versions 1, 2c, and 3. To exploit this vulnerability through SNMP v2c or earlier, the attacker must know a valid read-write or read-only SNMP community string for the affected system. To exploit this vulnerability through SNMP v3, the attacker must have valid SNMP user credentials for the affected system.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Ios | 12.2\(33\)cx |
| Cisco | Ios | 12.2\(33\)cy |
| Cisco | Ios | 12.2\(33\)cy1 |
| Cisco | Ios | 12.2\(33\)cy2 |
| Cisco | Ios | 12.2\(33\)ira |
| Cisco | Ios | 12.2\(33\)irb |
| Cisco | Ios | 12.2\(33\)irc |
| Cisco | Ios | 12.2\(33\)ird |
| Cisco | Ios | 12.2\(33\)ire |
| Cisco | Ios | 12.2\(33\)ire1 |
| Cisco | Ios | 12.2\(33\)ire2 |
| Cisco | Ios | 12.2\(33\)irf |
| Cisco | Ios | 12.2\(33\)irg |
| Cisco | Ios | 12.2\(33\)irg1 |
| Cisco | Ios | 12.2\(33\)irh |
| Cisco | Ios | 12.2\(33\)irh1 |
| Cisco | Ios | 12.2\(33\)mra |
| Cisco | Ios | 12.2\(33\)mrb |
| Cisco | Ios | 12.2\(33\)mrb1 |
| Cisco | Ios | 12.2\(33\)mrb2 |
| Cisco | Ios | 12.2\(33\)mrb3 |
| Cisco | Ios | 12.2\(33\)mrb4 |
| Cisco | Ios | 12.2\(33\)mrb5 |
| Cisco | Ios | 12.2\(33\)mrb6 |
| Cisco | Ios | 12.2\(33\)sb |
| Cisco | Ios | 12.2\(33\)sb1 |
| Cisco | Ios | 12.2\(33\)sb2 |
| Cisco | Ios | 12.2\(33\)sb3 |
| Cisco | Ios | 12.2\(33\)sb4 |
| Cisco | Ios | 12.2\(33\)sb5 |
| Cisco | Ios | 12.2\(33\)sb6 |
| Cisco | Ios | 12.2\(33\)sb7 |
| Cisco | Ios | 12.2\(33\)sb8 |
| Cisco | Ios | 12.2\(33\)sb8a |
| Cisco | Ios | 12.2\(33\)sb9 |
| Cisco | Ios | 12.2\(33\)sb10 |
| Cisco | Ios | 12.2\(33\)sb11 |
| Cisco | Ios | 12.2\(33\)sb12 |
| Cisco | Ios | 12.2\(33\)sb13 |
| Cisco | Ios | 12.2\(33\)sb14 |
| Cisco | Ios | 12.2\(33\)sb15 |
| Cisco | Ios | 12.2\(33\)sb16 |
| Cisco | Ios | 12.2\(33\)sb17 |
| Cisco | Ios | 12.2\(33\)sca |
| Cisco | Ios | 12.2\(33\)sca1 |
| Cisco | Ios | 12.2\(33\)sca2 |
| Cisco | Ios | 12.2\(33\)scb |
| Cisco | Ios | 12.2\(33\)scb1 |
| Cisco | Ios | 12.2\(33\)scb2 |
| Cisco | Ios | 12.2\(33\)scb3 |
Showing 50 of 1579 affected configurations. See NVD for the full list.
References
Timeline
- Published
- Last Modified
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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