Read the docs
TI-2006-04496 Aliases CVE-2006-4650GHSA-522v-5cvx-8x8h

Cisco IOS 12.0, 12.1, and 12.2, when GRE IP tunneling is used and the RFC2784 compliance…

Priority LOW 19Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
— Not recorded in CVSS 2.0
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
Partial · None · None
Fix status
No fix listed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA.

Summary

Cisco IOS 12.0, 12.1, and 12.2, when GRE IP tunneling is used and the RFC2784 compliance fixes are missing, does not verify the offset field of a GRE packet during decapsulation, which leads to an integer overflow that references data from incorrect memory locations, which allows remote attackers to inject crafted packets into the routing queue, possibly bypassing intended router ACLs.

Why it matters now

EPSS 0.03232 88th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios:12.0:*:*:*:*:*:*:*12.0VulnerableCisco
cpe:2.3:o:cisco:ios:12.1:*:*:*:*:*:*:*12.1VulnerableCisco
cpe:2.3:o:cisco:ios:12.2:*:*:*:*:*:*:*12.2VulnerableCisco
  • cpe:2.3:o:cisco:ios:12.0:*:*:*:*:*:*:* Versions 12.0 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:12.1:*:*:*:*:*:*:* Versions 12.1 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:12.2:*:*:*:*:*:*:* Versions 12.2 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2006-4650
  2. 2026-10-03 Alias added: GHSA-522v-5cvx-8x8h

References

Advisory 3

Other 3

  • TI-2018-00138 Improper input validation in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-09019 Improper input validation 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-2017-04499 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
  • TI-2017-04498 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
See all 617 →

Sources

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