LOW
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
Published Sep 9, 2006
2.6
LOWCVSS 2.0
EPSS 3.17%
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.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
2.6 LOW NVD
AV:N/AC:H/Au:N/C:P/I:N/A:N
Access Vector Network
Access Complexity High
Authentication None
Confidentiality Impact Partial
Integrity Impact None
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
3.17% 0.03173
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
EPSS probability 0.03173
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 3.17% (0.03173) | 87.60th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.99% (0.02986) | 85.51th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.50% (0.00496) | 63.71th | v4 (v2025.03.14) |
| Dec 29, 2024 | 11.35% (0.11353) | 95.18th | v3 (v2023.03.01) |
| Dec 17, 2024 | 16.84% (0.16845) | 96.03th | v3 (v2023.03.01) |
| Jul 30, 2024 | 12.64% (0.12636) | 95.52th | v3 (v2023.03.01) |
| Mar 21, 2024 | 9.32% (0.09322) | 94.55th | v3 (v2023.03.01) |
| Nov 4, 2023 | 8.80% (0.08801) | 93.88th | v3 (v2023.03.01) |
| Sep 27, 2023 | 14.57% (0.14575) | 95.08th | v3 (v2023.03.01) |
| Aug 20, 2023 | 9.20% (0.09196) | 93.90th | v3 (v2023.03.01) |
| Jul 13, 2023 | 2.39% (0.02387) | 88.35th | v3 (v2023.03.01) |
| Jun 5, 2023 | 1.43% (0.01433) | 84.64th | v3 (v2023.03.01) |
| Apr 28, 2023 | 1.51% (0.01512) | 85.00th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.93% (0.00934) | 80.62th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.17% (0.02172) | 80.77th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.17% (0.02172) | 78.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.17% (0.02172) | 57.73th | v2 (v2022.01.01) |
Weaknesses (0)
No CWE recorded.
References (11)
- http://secunia.com/advisories/21783 third-party-advisoryx_refsource_SECUNIA
- http://securityreason.com/securityalert/1526 third-party-advisoryx_refsource_SREASON
- http://securitytracker.com/id?1016799 vdb-entryx_refsource_SECTRACK
- http://www.cisco.com/en/US/tech/tk827/tk369/tsd_technology_security_response09186a008072cd7b.html vendor-advisoryx_refsource_CISCO
- http://www.osvdb.org/28590 vdb-entryx_refsource_OSVDB
- http://www.phenoelit.de/stuff/CiscoGRE.txt x_refsource_MISCVendor Advisory
- http://www.securityfocus.com/archive/1/445322/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/bid/19878 vdb-entryx_refsource_BID
- http://www.vupen.com/english/advisories/2006/3502 vdb-entryx_refsource_VUPEN
- https://exchange.xforce.ibmcloud.com/vulnerabilities/28786 vdb-entryx_refsource_XF
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5713 vdb-entrysignaturex_refsource_OVAL
| Link | Providers | Tags |
|---|---|---|
| http://secunia.com/advisories/21783 | third-party-advisoryx_refsource_SECUNIA | |
| http://securityreason.com/securityalert/1526 | third-party-advisoryx_refsource_SREASON | |
| http://securitytracker.com/id?1016799 | vdb-entryx_refsource_SECTRACK | |
| http://www.cisco.com/en/US/tech/tk827/tk369/tsd_technology_security_response09186a008072cd7b.html | vendor-advisoryx_refsource_CISCO | |
| http://www.osvdb.org/28590 | vdb-entryx_refsource_OSVDB | |
| http://www.phenoelit.de/stuff/CiscoGRE.txt | x_refsource_MISCVendor Advisory | |
| http://www.securityfocus.com/archive/1/445322/100/0/threaded | mailing-listx_refsource_BUGTRAQ | |
| http://www.securityfocus.com/bid/19878 | vdb-entryx_refsource_BID | |
| http://www.vupen.com/english/advisories/2006/3502 | vdb-entryx_refsource_VUPEN | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/28786 | vdb-entryx_refsource_XF | |
| https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5713 | vdb-entrysignaturex_refsource_OVAL |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Sep 9, 2006
Updated Aug 7, 2024
Reserved Sep 8, 2006
Link CVE-2006-4650
CISA Vulnrichment
Updated n/a