vulnwire
8.6high

CVE-2018-0155KEVin critical feed

A vulnerability in the Bidirectional Forwarding Detection (BFD) offload implementation of Cisco Catalyst 4500 Series Switches and Cisco Cat…

Published 8 y ago · modified 4 mo ago · JSON

CVSS
8.6
v3.1 · CNA
CISA KEV
Yes
added 2022-03-03
EPSS
7.7%
percentile 95%
Public exploits
0
none known

A vulnerability in the Bidirectional Forwarding Detection (BFD) offload implementation of Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches could allow an unauthenticated, remote attacker to cause a crash of the iosd process, causing a denial of service (DoS) condition. The vulnerability is due to insufficient error handling when the BFD header in a BFD packet is incomplete. An attacker could exploit this vulnerability by sending a crafted BFD message to or across an affected switch. A successful exploit could allow the attacker to trigger a reload of the system. This vulnerability affects Catalyst 4500 Supervisor Engine 6-E (K5), Catalyst 4500 Supervisor Engine 6L-E (K10), Catalyst 4500 Supervisor Engine 7-E (K10), Catalyst 4500 Supervisor Engine 7L-E (K10), Catalyst 4500E Supervisor Engine 8-E (K10), Catalyst 4500E Supervisor Engine 8L-E (K10), Catalyst 4500E Supervisor Engine 9-E (K10), Catalyst 4500-X Series Switches (K10), Catalyst 4900M Switch (K5), Catalyst 4948E Ethernet Switch (K5). Cisco Bug IDs: CSCvc40729.

Known exploited (CISA KEV)

Added
4 y ago
Due date
2022-03-17 (4 y ago)
Ransomware use
Unknown
Required action
Apply updates per vendor instructions.
Vendor / product
Cisco / Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches
CISA name
Cisco Catalyst Bidirectional Forwarding Detection Denial-of-Service Vulnerability

CISA SSVC assessment

Exploitation
Active — exploited in the wild
Automatable
yes
Technical impact
partial
Assessed
23 mo ago

Exploit prediction (EPSS)

7.74% probability of exploitation in the next 30 days, higher than 95% of all scored CVEs.

CVSS scores

Assigned byVersionScoreVector
CISA ADP3.18.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD3.18.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CNA3.18.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD2.07.8AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

  • n/a Cisco IOS and IOS XE

Classification

Weakness
  • CWE-388 7PK - Errors
  • CWE-755 Improper Handling of Exceptional Conditions
Technology feeds
Cisco IOS (RSS, critical only)

References

  • securitytracker.com /id/1040587 · vdb-entry, x_refsource_SECTRACK, x_transferred
  • securityfocus.com /bid/103565 · vdb-entry, x_refsource_BID, x_transferred
  • tools.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-bfd · x_refsource_CONFIRM, x_transferred
  • ics-cert.us-cert.gov /advisories/ICSA-18-107-05 · x_refsource_MISC, x_transferred
  • cisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0155 · government-resource

Sources

vulnwire keeps one entry per vulnerability: the CVE id wins, then GHSA; records that alias each other are merged. Machine-readable: JSON.