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CVE-2026-20124— Cisco IOS XE Software SNMP Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco IOS XE Software
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco IOS XE Software是美国Cisco公司的一款管理网络设备的操作系统。 Cisco IOS XE Software存在资源管理错误漏洞，该漏洞源于SNMP子系统解析SNMP请求时错误处理不当，可能导致设备意外重新加载，造成拒绝服务。

CVSS 7.7 · High EPSS 0.50% · P40

Affected Version Matrix 277

VendorProduct Version RangeStatus
Cisco Cisco IOS XE Software 17.2.1a affected
3.18.7SP affected
16.12.1y affected
16.12.3s affected
16.7.1b affected
16.6.2 affected
16.6.5 affected
16.12.1w affected
… +269 more rows
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I. Basic Information for CVE-2026-20124

Vulnerability Information
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Vulnerability Title
Cisco IOS XE Software SNMP Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS XE Software could allow an authenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to improper error handling when parsing SNMP requests. This vulnerability affects all versions of SNMP — Versions 1, 2c, and 3. An attacker could exploit this vulnerability by sending a malformed SNMP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly. The attacker must have the SNMPv1 or v2c read-only or read-write community string or valid SNMPv3 user credentials on the affected device.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对已超过有效生命周期的资源丧失索引
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco IOS XE Software 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS XE Software是美国Cisco公司的一款管理网络设备的操作系统。 Cisco IOS XE Software存在资源管理错误漏洞，该漏洞源于SNMP子系统解析SNMP请求时错误处理不当，可能导致设备意外重新加载，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco IOS XE Software 17.2.1a -

II. Public POCs for CVE-2026-20124

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III. Intelligence Information for CVE-2026-20124

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Vendor Advisories for CVE-2026-20124 (1)

Same Patch Batch · Cisco · 2026-08-05 · 23 CVEs total

CVE-2026-20304 9.9 CRITICAL Cisco Catalyst SD-WAN Security Hardening Release - Access Control Vulnerabilities
CVE-2026-20303 9.9 CRITICAL Cisco Catalyst SD-WAN Security Hardening Release - Input Validation Vulnerabilities
CVE-2026-20272 9.8 CRITICAL Cisco IOS XE Software Security Hardening Release
CVE-2026-20310 9.1 CRITICAL Cisco SD-WAN Software Security Hardening Release - Improper Link Resolution Before File Ac
CVE-2026-20267 9.0 CRITICAL Cisco IOS XE Software Security Hardening Release
CVE-2026-20312 8.8 HIGH Cisco Catalyst SD-WAN Security Hardening Release - Information Disclosure Vulnerabilities
CVE-2026-20200 8.8 HIGH Cisco Integrated Management Controller Argument Injection and Remote Code Execution Vulner
CVE-2026-20263 8.6 HIGH Cisco IOS XE Software Blocks Extensible Exchange Protocol Denial of Service Vulnerability
CVE-2026-20268 8.6 HIGH Cisco IOS XE Software Security Hardening Release
CVE-2026-20269 8.6 HIGH Cisco IOS XE Software Security Hardening Release
CVE-2026-20270 8.6 HIGH Cisco IOS XE Software Security Hardening Release
CVE-2026-20271 8.6 HIGH Cisco IOS XE Software Security Hardening Release
CVE-2026-20273 8.6 HIGH Cisco IOS XE Software Security Hardening Release
CVE-2026-20301 8.6 HIGH Cisco IOS Software and IOS XE Software Extensible Messaging Client Protocol Denial of Serv
CVE-2026-20313 7.7 HIGH Cisco Catalyst SD-WAN Security Hardening Release - Memory Corruption Vulnerabilities
CVE-2026-20294 6.5 MEDIUM Cisco Catalyst SD-WAN Manager Information Disclosure Vulnerability
CVE-2026-20288 6.5 MEDIUM Cisco IMC Remote Code Execution Vulnerability Remote Code Execution Vulnerability
CVE-2026-20311 6.3 MEDIUM Cisco IOS XE Software Web UI Denial of Service Vulnerability
CVE-2026-20289 5.7 MEDIUM Cisco RoomOS Logging Subsystem Information Disclosure Vulnerability
CVE-2026-20028 5.0 MEDIUM Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability

Showing top 20 of 23 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Cisco IOS XE Software
Same vendor: Cisco
Same weakness: CWE-772

V. Comments for CVE-2026-20124

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