Cisco IOS and IOS XE Software Improper Input Validation Vulnerability. 悪用が確認されています：CISA は 03/03/2022 にこの脆弱性を「既知の悪用された脆弱性（KEV）」カタログに追加しました。影響を受けるシステムは緊急に修正してください。
| パッケージ | 影響を受けるバージョン | 修正済みバージョン |
|---|---|---|
| IOS and IOS XE Software | バージョン情報は未公開（製品名は CISA KEV による） | |
A vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a Relay Reply denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of encapsulated option 82 information that it receives in DHCPOFFER messages from DHCPv4 servers. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device, which the device would then forward to a DHCPv4 server. When the affected software processes the option 82 information that is encapsulated in the response from the server, an error could occur. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvg62754.
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