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TI-2018-00426 Aliases CVE-2018-0467GHSA-w77w-7rqr-q6v8

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

Priority MEDIUM 50CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03814 90th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco IOS Softwareall versions—No fix listedCNA
  • Cisco IOS Software VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios_xe:15.6\(2\)sp:*:*:*:*:*:*:*15.6(2)spVulnerableCisco
cpe:2.3:o:cisco:ios_xe:16.6.1:*:*:*:*:*:*:*16.6.1VulnerableCisco
cpe:2.3:o:cisco:ios_xe:everest-16.6.1:*:*:*:*:*:*:*everest-16.6.1VulnerableCisco
  • cpe:2.3:o:cisco:ios_xe:15.6\(2\)sp:*:*:*:*:*:*:* Versions 15.6(2)sp Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:16.6.1:*:*:*:*:*:*:* Versions 16.6.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xe:everest-16.6.1:*:*:*:*:*:*:* Versions everest-16.6.1 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-0467
  2. 2026-10-03 Alias added: GHSA-w77w-7rqr-q6v8
  3. 2026-10-23 EPSS moved to the 90th–95th percentile
  4. 2026-10-25 EPSS moved to the 50th–90th percentile
  5. 2026-10-28 EPSS moved to the 90th–95th percentile

References

Advisory 1

Other 1

  • TI-2023-06904 Cisco is providing an update for the ongoing investigation into observed exploitation of… KEVCVSS 3.1CRITICAL 10.0
  • TI-2018-00122 Memory corruption in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-02977 Improper input validation in Cisco IOS and IOS XE Software KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-00135 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.8
  • TI-2017-04498 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
  • TI-2017-04497 Memory corruption in Cisco IOS XE Software KEVCVSS 3.1HIGH 8.8
See all 561 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences