Unrated severityNVD Advisory· Published Sep 9, 2006· Updated Jun 16, 2026
CVE-2006-4650
CVE-2006-4650
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
4cpe:2.3:o:cisco:ios:12.0:*:*:*:*:*:*:*+ 3 more
- cpe:2.3:o:cisco:ios:12.0:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios:12.1:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:ios:12.2:*:*:*:*:*:*:*
- (no CPE)range: 12.0, 12.1, 12.2
Patches
Vulnerability mechanics
References
11- www.phenoelit.de/stuff/CiscoGRE.txtnvdVendor Advisory
- secunia.com/advisories/21783nvd
- securityreason.com/securityalert/1526nvd
- securitytracker.com/idnvd
- www.cisco.com/en/US/tech/tk827/tk369/tsd_technology_security_response09186a008072cd7b.htmlnvd
- www.osvdb.org/28590nvd
- www.securityfocus.com/archive/1/445322/100/0/threadednvd
- www.securityfocus.com/bid/19878nvd
- www.vupen.com/english/advisories/2006/3502nvd
- exchange.xforce.ibmcloud.com/vulnerabilities/28786nvd
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5713nvd
News mentions
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