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IOS and IOS XE — security advisories

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Every advisory CSIRTS.com has correlated to IOS and IOS XE, newest first — across national CERTs, vendor PSIRTs and vulnerability databases.

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CVE-2025-20352: Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability

criticalexploitedCVE-2025-20352cisa-kev2025-09-29

CVE-2023-20109: Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability

criticalexploitedCVE-2023-20109cisa-kev2023-10-10

CVE-2017-6742: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability

criticalexploitedCVE-2017-6742cisa-kev2023-04-19

CVE-2017-3881: Cisco IOS and IOS XE Remote Code Execution Vulnerability

criticalexploitedCVE-2017-3881cisa-kev2022-03-25