Cisco IOS and IOS XE Software IPv6 Hop-by-Hop Options Denial of Service Vulnerability

published 2018-10-05 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-1290

cvss: 8.6; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 3.8%; EPSS 3.8% chance of exploitation in 30 days, percentile 90%
public exploits: 0; none known

A vulnerability in the IPv6 processing code of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload. The vulnerability is due to incorrect handling of specific IPv6 hop-by-hop options. An attacker could exploit this vulnerability by sending a malicious IPv6 packet to or through the affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-19-094-03 updated 2019-04-04 cvss 8.6

Rockwell Automation Stratix 5400/5410/5700/8000/8300 and ArmorStratix 5700

Rockwell Automation Allen-Bradley ArmorStratix 5700 <= 15.2(6)E0a Rockwell Automation Allen-Bradley Stratix 5400 <= 15.2(6)E0a Rockwell Automation Allen-Bradley Stratix 5410 <= 15.2(6)E0a Rockwell Automation Allen-Bradley Stratix 5700 <= 15.2(6)E0a Rockwell Automation Allen-Bradley Stratix 8000 <= 15.2(6)E0a Rockwell Automation Allen-Bradley Stratix 8300 < 15.2(4)EA7
affected: vendor fix, mitigation “FRN 15.2(6)E2a: Allen-Bradley Stratix 5400” rockwellautomation.custhelp.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 23 mo ago (2024-11-25)

Exploit prediction

3.81% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	8.6	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD	2.0	7.8	AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

Cisco Cisco IOS Software

Classification

Weakness

CWE-20 Improper Input Validation

Technology feeds

Cisco IOS rss critical rss

References

tools.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-ipv6hbh
vendor-advisory
securitytracker.com /id/1041737
vdb-entry, third-party-advisory
ics-cert.us-cert.gov /advisories/ICSA-19-094-03

Sources

CVE List CVE-2018-0467
NVD CVE-2018-0467

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary