CVE-2025-20171

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.

Published: 2025-02-05 Last update: 2025-07-03 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-20171 is rated Moderate Risk (58.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.95%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-20171

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-09 0.31% 0.95% +0.64%
2 2026-03-16 0.15% 0.31% +0.16%
3 2025-12-28 — 0.15% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-20171

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.7 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.1 4.0 [email protected]

Weakness enumeration for CVE-2025-20171

Affected software / configurations for CVE-2025-20171

Vendor Product Version Raw CPE
cisco ios 12.2\(33\)cx cpe:2.3:o:cisco:ios:12.2\(33\)cx:*:*:*:*:*:*:*
cisco ios 12.2\(33\)cy cpe:2.3:o:cisco:ios:12.2\(33\)cy:*:*:*:*:*:*:*
cisco ios 12.2\(33\)cy1 cpe:2.3:o:cisco:ios:12.2\(33\)cy1:*:*:*:*:*:*:*
cisco ios 12.2\(33\)cy2 cpe:2.3:o:cisco:ios:12.2\(33\)cy2:*:*:*:*:*:*:*
cisco ios 12.2\(33\)ira cpe:2.3:o:cisco:ios:12.2\(33\)ira:*:*:*:*:*:*:*
cisco ios 12.2\(33\)irb cpe:2.3:o:cisco:ios:12.2\(33\)irb:*:*:*:*:*:*:*
cisco ios 12.2\(33\)irc cpe:2.3:o:cisco:ios:12.2\(33\)irc:*:*:*:*:*:*:*
cisco ios 12.2\(33\)ird cpe:2.3:o:cisco:ios:12.2\(33\)ird:*:*:*:*:*:*:*
cisco ios 12.2\(33\)ire cpe:2.3:o:cisco:ios:12.2\(33\)ire:*:*:*:*:*:*:*
cisco ios 12.2\(33\)ire1 cpe:2.3:o:cisco:ios:12.2\(33\)ire1:*:*:*:*:*:*:*
cisco ios 12.2\(33\)ire2 cpe:2.3:o:cisco:ios:12.2\(33\)ire2:*:*:*:*:*:*:*
cisco ios 12.2\(33\)irf cpe:2.3:o:cisco:ios:12.2\(33\)irf:*:*:*:*:*:*:*
cisco ios 12.2\(33\)irg cpe:2.3:o:cisco:ios:12.2\(33\)irg:*:*:*:*:*:*:*
cisco ios 12.2\(33\)irg1 cpe:2.3:o:cisco:ios:12.2\(33\)irg1:*:*:*:*:*:*:*
cisco ios 12.2\(33\)irh cpe:2.3:o:cisco:ios:12.2\(33\)irh:*:*:*:*:*:*:*
cisco ios 12.2\(33\)irh1 cpe:2.3:o:cisco:ios:12.2\(33\)irh1:*:*:*:*:*:*:*
cisco ios 12.2\(33\)mra cpe:2.3:o:cisco:ios:12.2\(33\)mra:*:*:*:*:*:*:*
cisco ios 12.2\(33\)mrb cpe:2.3:o:cisco:ios:12.2\(33\)mrb:*:*:*:*:*:*:*
cisco ios 12.2\(33\)mrb1 cpe:2.3:o:cisco:ios:12.2\(33\)mrb1:*:*:*:*:*:*:*
cisco ios 12.2\(33\)mrb2 cpe:2.3:o:cisco:ios:12.2\(33\)mrb2:*:*:*:*:*:*:*
cisco ios 12.2\(33\)mrb3 cpe:2.3:o:cisco:ios:12.2\(33\)mrb3:*:*:*:*:*:*:*
cisco ios 12.2\(33\)mrb4 cpe:2.3:o:cisco:ios:12.2\(33\)mrb4:*:*:*:*:*:*:*
cisco ios 12.2\(33\)mrb5 cpe:2.3:o:cisco:ios:12.2\(33\)mrb5:*:*:*:*:*:*:*
cisco ios 12.2\(33\)mrb6 cpe:2.3:o:cisco:ios:12.2\(33\)mrb6:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb cpe:2.3:o:cisco:ios:12.2\(33\)sb:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb1 cpe:2.3:o:cisco:ios:12.2\(33\)sb1:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb2 cpe:2.3:o:cisco:ios:12.2\(33\)sb2:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb3 cpe:2.3:o:cisco:ios:12.2\(33\)sb3:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb4 cpe:2.3:o:cisco:ios:12.2\(33\)sb4:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb5 cpe:2.3:o:cisco:ios:12.2\(33\)sb5:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb6 cpe:2.3:o:cisco:ios:12.2\(33\)sb6:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb7 cpe:2.3:o:cisco:ios:12.2\(33\)sb7:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb8 cpe:2.3:o:cisco:ios:12.2\(33\)sb8:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb8a cpe:2.3:o:cisco:ios:12.2\(33\)sb8a:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb9 cpe:2.3:o:cisco:ios:12.2\(33\)sb9:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb10 cpe:2.3:o:cisco:ios:12.2\(33\)sb10:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb11 cpe:2.3:o:cisco:ios:12.2\(33\)sb11:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb12 cpe:2.3:o:cisco:ios:12.2\(33\)sb12:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb13 cpe:2.3:o:cisco:ios:12.2\(33\)sb13:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb14 cpe:2.3:o:cisco:ios:12.2\(33\)sb14:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb15 cpe:2.3:o:cisco:ios:12.2\(33\)sb15:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb16 cpe:2.3:o:cisco:ios:12.2\(33\)sb16:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sb17 cpe:2.3:o:cisco:ios:12.2\(33\)sb17:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sca cpe:2.3:o:cisco:ios:12.2\(33\)sca:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sca1 cpe:2.3:o:cisco:ios:12.2\(33\)sca1:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sca2 cpe:2.3:o:cisco:ios:12.2\(33\)sca2:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scb cpe:2.3:o:cisco:ios:12.2\(33\)scb:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scb1 cpe:2.3:o:cisco:ios:12.2\(33\)scb1:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scb2 cpe:2.3:o:cisco:ios:12.2\(33\)scb2:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scb3 cpe:2.3:o:cisco:ios:12.2\(33\)scb3:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scb4 cpe:2.3:o:cisco:ios:12.2\(33\)scb4:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scb5 cpe:2.3:o:cisco:ios:12.2\(33\)scb5:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scb6 cpe:2.3:o:cisco:ios:12.2\(33\)scb6:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scb7 cpe:2.3:o:cisco:ios:12.2\(33\)scb7:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scb8 cpe:2.3:o:cisco:ios:12.2\(33\)scb8:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scb9 cpe:2.3:o:cisco:ios:12.2\(33\)scb9:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scb10 cpe:2.3:o:cisco:ios:12.2\(33\)scb10:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scb11 cpe:2.3:o:cisco:ios:12.2\(33\)scb11:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scc cpe:2.3:o:cisco:ios:12.2\(33\)scc:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scc1 cpe:2.3:o:cisco:ios:12.2\(33\)scc1:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scc2 cpe:2.3:o:cisco:ios:12.2\(33\)scc2:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scc3 cpe:2.3:o:cisco:ios:12.2\(33\)scc3:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scc4 cpe:2.3:o:cisco:ios:12.2\(33\)scc4:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scc5 cpe:2.3:o:cisco:ios:12.2\(33\)scc5:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scc6 cpe:2.3:o:cisco:ios:12.2\(33\)scc6:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scc7 cpe:2.3:o:cisco:ios:12.2\(33\)scc7:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scd cpe:2.3:o:cisco:ios:12.2\(33\)scd:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scd1 cpe:2.3:o:cisco:ios:12.2\(33\)scd1:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scd2 cpe:2.3:o:cisco:ios:12.2\(33\)scd2:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scd3 cpe:2.3:o:cisco:ios:12.2\(33\)scd3:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scd4 cpe:2.3:o:cisco:ios:12.2\(33\)scd4:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scd5 cpe:2.3:o:cisco:ios:12.2\(33\)scd5:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scd6 cpe:2.3:o:cisco:ios:12.2\(33\)scd6:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scd7 cpe:2.3:o:cisco:ios:12.2\(33\)scd7:*:*:*:*:*:*:*
cisco ios 12.2\(33\)scd8 cpe:2.3:o:cisco:ios:12.2\(33\)scd8:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sce cpe:2.3:o:cisco:ios:12.2\(33\)sce:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sce1 cpe:2.3:o:cisco:ios:12.2\(33\)sce1:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sce2 cpe:2.3:o:cisco:ios:12.2\(33\)sce2:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sce3 cpe:2.3:o:cisco:ios:12.2\(33\)sce3:*:*:*:*:*:*:*
cisco ios 12.2\(33\)sce4 cpe:2.3:o:cisco:ios:12.2\(33\)sce4:*:*:*:*:*:*:*

References for CVE-2025-20171

cvelogic Threat Intelligence