CVE-2017-12240 on CISA KEV

The DHCP relay subsystem of Cisco IOS 12.2 through 15.6 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. The attacker could also cause an affected system

01What CISA says about this vulnerability

The DHCP relay subsystem of Cisco IOS 12.2 through 15.6 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. The attacker could also cause an affected system to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to a buffer overflow condition in…

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• quickview.cloudapps.cisco.com — https://quickview.cloudapps.cisco.com/quickview/bug/CSCuw77959
• quickview.cloudapps.cisco.com — https://quickview.cloudapps.cisco.com/quickview/bug/CSCsm45390
• www.securityfocus.com — http://www.securityfocus.com/bid/101034
• tools.cisco.com — https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2…
• www.securitytracker.com — http://www.securitytracker.com/id/1039445

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
n	a / Cisco IOS and IOS XE	Cisco IOS and IOS XE

06Detection

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