VulnerabilityModified

CVE-2018-0241

HIGH 7.4EPSS 0.84%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.84%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

A vulnerability in the UDP broadcast forwarding function of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on the affected device. The vulnerability is due to improper handling of UDP broadcast packets that are forwarded to an IPv4 helper address. An attacker could exploit this vulnerability by sending multiple UDP broadcast packets to the affected device. An exploit could allow the attacker to cause a buffer leak on the affected device, eventually resulting in a DoS condition requiring manual intervention to recover. This vulnerability affects all Cisco IOS XR platforms running 6.3.1, 6.2.3, or earlier releases of Cisco IOS XR Software when at least one IPv4 helper address is configured on an interface of the device. Cisco Bug IDs: CSCvi35625.

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: 0.84% probability · 56th percentile
CISA KEV: Not listed
Weakness: CWE-399
Affected: cisco/ios xr
Source: psirt@cisco.com

References

http://www.securityfocus.com/bid/103929Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1040710Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-iosxrVendor Advisory
http://www.securityfocus.com/bid/103929Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1040710Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-iosxrVendor Advisory

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