VulnerabilityModified

CVE-2017-3849

HIGH 7.4EPSS 0.76%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.76%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

A vulnerability in the Autonomic Networking Infrastructure (ANI) registrar feature of Cisco IOS Software (possibly 15.2 through 15.6) and Cisco IOS XE Software (possibly 3.7 through 3.18, and 16) could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition. The vulnerability is due to incomplete input validation on certain crafted packets. An attacker could exploit this vulnerability by sending a crafted autonomic network channel discovery packet to a device that has all the following characteristics: (1) running a Cisco IOS Software or Cisco IOS XE Software release that supports the ANI feature; (2) configured as an autonomic registrar; (3) has a whitelist configured. An exploit could allow the attacker to cause the affected device to reload. Note: Autonomic networking should be configured with a whitelist. Do not remove the whitelist as a workaround. Cisco Bug IDs: CSCvc42717.

CVSS 3.0: 7.4 HIGHCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS: 0.76% probability · 53th percentile
CISA KEV: Not listed
Weakness: CWE-20
Affected: cisco/ios · cisco/ios xe
Source: psirt@cisco.com

References

http://www.securityfocus.com/bid/96972Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1038064
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170320-aniVendor Advisory
http://www.securityfocus.com/bid/96972Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1038064
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170320-aniVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.