What is CVE-2018-0239?

CVE-2018-0239 is a high-severity vulnerability in Cisco Asr 5700, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2018-04-19.

How severe is CVE-2018-0239?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2018-0239 known to be exploited?

5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Resource exhaustion in Cisco Asr 5700

CVE-2018-0239

A vulnerability in the egress packet processing functionality of the Cisco StarOS operating system for Cisco Aggregation Services Router (ASR) 5700 Series devices and Virtualized Packet Core (VPC) System Software could allow an unauthenticated, remote attacker to cause an interface on the device to cease forwarding packets. The device may need to be manually reloaded to clear this Interface Forwarding Denial of Service condition. The vulnerability is due to the failure to properly check that the length of a packet to transmit does not exceed the maximum supported length of the network interface card (NIC). An attacker could exploit this vulnerability by sending a crafted IP packet or a series of crafted IP fragments through an interface on the targeted device. A successful exploit could allow the attacker to cause the network interface to cease forwarding packets. This vulnerability could be triggered by either IPv4 or IPv6 network traffic. This vulnerability affects the following Cisco products when they are running the StarOS operating system and a virtual interface card is installed on the device: Aggregation Services Router (ASR) 5700 Series, Virtualized Packet Core-Distributed Instance (VPC-DI) System Software, Virtualized Packet Core-Single Instance (VPC-SI) System Software. Cisco Bug IDs: CSCvf32385.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.034 (87.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Cisco Asr_5700
Cisco Staros — versions 21.0.v0.65819, 21.0.v4, 21.1.v6
N/a Cisco Staros — versions Cisco StarOS

Weakness classification (CWE)

Public proof-of-concept exploits

References

psirt@cisco.com (x_refsource_CONFIRM, Vendor Advisory)
psirt@cisco.com (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_BID)
psirt@cisco.com (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_SECTRACK)

Frequently asked questions

What is CVE-2018-0239?: CVE-2018-0239 is a high-severity vulnerability in Cisco Asr 5700, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2018-04-19.
How severe is CVE-2018-0239?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2018-0239 known to be exploited?: 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.