The Neighbor Discovery (ND) protocol implementation in the IPv6 stack in Cisco IOS before 15.0(1)XA5 allows remote attackers to cause a denial of service (CPU consumption and device hang) by sending many Router Advertisement (RA) messages with different source addresses, as demonstrated by the flood_router6 program in the thc-ipv6 package, aka Bug ID CSCti33534
Published Jan 7, 2011
7.8
HIGHCVSS 2.0
EPSS 3.62%
Description
The Neighbor Discovery (ND) protocol implementation in the IPv6 stack in Cisco IOS before 15.0(1)XA5 allows remote attackers to cause a denial of service (CPU consumption and device hang) by sending many Router Advertisement (RA) messages with different source addresses, as demonstrated by the flood_router6 program in the thc-ipv6 package, aka Bug ID CSCti33534.
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.
AV:N/AC:L/Au:N/C:N/I:N/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
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 (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.62% (0.03618) | 89.14th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.62% (0.03618) | 87.99th | v5 (v2026.06.15) |
| Mar 17, 2025 | 2.11% (0.02110) | 82.92th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.83% (0.00833) | 82.72th | v3 (v2023.03.01) |
| Jul 18, 2024 | 0.83% (0.00833) | 82.21th | v3 (v2023.03.01) |
| Apr 17, 2024 | 1.20% (0.01203) | 85.02th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.20% (0.01203) | 83.02th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.32% (0.01319) | 71.27th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.32% (0.01319) | 71.23th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.32% (0.01319) | 69.22th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.32% (0.01319) | 44.98th | v2 (v2022.01.01) |
References (7)
- http://events.ccc.de/congress/2010/Fahrplan/events/3957.en.html x_refsource_MISCExploitThird Party Advisory
- http://mirror.fem-net.de/CCC/27C3/mp3-audio-only/27c3-3957-en-ipv6_insecurities.mp3 x_refsource_MISCExploitThird Party Advisory
- http://mirror.fem-net.de/CCC/27C3/mp4-h264-HQ/27c3-3957-en-ipv6_insecurities.mp4 x_refsource_MISCThird Party Advisory
- http://www.ciscosystems.com/en/US/docs/ios/15_0/15_0x/15_01_XA/rn800xa.pdf x_refsource_CONFIRMBroken Link
- http://www.securityfocus.com/bid/45760 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.youtube.com/watch?v=00yjWB6gGy8 x_refsource_MISCThird Party Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/64589 vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry
| Link | Providers | Tags |
|---|---|---|
| http://events.ccc.de/congress/2010/Fahrplan/events/3957.en.html | x_refsource_MISCExploitThird Party Advisory | |
| http://mirror.fem-net.de/CCC/27C3/mp3-audio-only/27c3-3957-en-ipv6_insecurities.mp3 | x_refsource_MISCExploitThird Party Advisory | |
| http://mirror.fem-net.de/CCC/27C3/mp4-h264-HQ/27c3-3957-en-ipv6_insecurities.mp4 | x_refsource_MISCThird Party Advisory | |
| http://www.ciscosystems.com/en/US/docs/ios/15_0/15_0x/15_01_XA/rn800xa.pdf | x_refsource_CONFIRMBroken Link | |
| http://www.securityfocus.com/bid/45760 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.youtube.com/watch?v=00yjWB6gGy8 | x_refsource_MISCThird Party Advisory | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/64589 | vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry |
Change history (0)
No recorded changes yet.