CVE-2006-4650

Name: CVE-2006-4650
Creator: NVD / NIST
Published: 2006-09-09T00:04:00+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.99%

Last modified Jun 16, 2026

CVE-2006-4650 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 2.99% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

2.99%

85.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Cisco	Ios	12.0
Cisco	Ios	12.1
Cisco	Ios	12.2

References

Timeline

Published: Sep 9, 2006
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2006-4650?

How severe is CVE-2006-4650?

Severity scoring for CVE-2006-4650 is pending analysis. The EPSS model estimates a 2.99% probability of exploitation in the next 30 days.

How do I fix CVE-2006-4650?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2006-4650?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST