Cisco IOS and IOS XE Software DHCP Remote Code Execution Vulnerability (CVE-2017-12240)
Severity: critical · Patch status: patched · Since 2022-03-03 · CVE-2017-12240
The Dynamic Host Configuration Protocol (DHCP) relay subsystem of Cisco IOS and Cisco IOS XE Software contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code and gain full control of an affected system. CISA added CVE-2017-12240 to its Known Exploited Vulnerabilities catalog on Mar 3, 2022, which means attackers are exploiting it in the wild.
What to do
- Apply updates per vendor instructions.
- US federal agencies must remediate by Mar 24, 2022 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
