A vulnerability in MikroTik Version 6.38.5 could allow an unauthenticated remote attacker to exhaust all available CPU via a flood of UDP packets on port 500 (used for L2TP over IPsec), preventing the affected router from accepting new connections; all devices will be disconnected from the router and all logs removed automatically
Published May 18, 2017
7.5
HIGHCVSS 3.0
EPSS 4.21%
Description
A vulnerability in MikroTik Version 6.38.5 could allow an unauthenticated remote attacker to exhaust all available CPU via a flood of UDP packets on port 500 (used for L2TP over IPsec), preventing the affected router from accepting new connections; all devices will be disconnected from the router and all logs removed automatically.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 4.21% (0.04207) | 90.66th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.21% (0.04207) | 89.64th | v5 (v2026.06.15) |
| Apr 6, 2025 | 3.40% (0.03396) | 86.32th | v4 (v2025.03.14) |
| Mar 30, 2025 | 6.73% (0.06727) | 90.36th | v4 (v2025.03.14) |
| Mar 29, 2025 | 4.05% (0.04054) | 80.55th | v4 (v2025.03.14) |
| Mar 20, 2025 | 6.73% (0.06727) | 90.47th | v4 (v2025.03.14) |
| Mar 17, 2025 | 4.60% (0.04601) | 88.51th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.93% (0.00934) | 83.22th | v3 (v2023.03.01) |
| Apr 4, 2024 | 0.93% (0.00934) | 82.72th | v3 (v2023.03.01) |
| May 8, 2023 | 0.93% (0.00934) | 80.72th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.70% (0.00703) | 77.25th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 17, 2023 | 1.21% (0.01213) | 66.22th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.31% (0.01306) | 31.19th | v1 |
| Jan 6, 2022 | 1.31% (0.01306) | 30.55th | v1 |
| Sep 1, 2021 | 1.31% (0.01306) | 69.61th | v1 |
| Apr 14, 2021 | 1.31% (0.01306) | 0.00th | v1 |
References (4)
- http://seclists.org/fulldisclosure/2017/May/59 x_refsource_MISCExploitThird Party Advisory
- https://cxsecurity.com/issue/WLB-2017050062 x_refsource_MISCExploitThird Party Advisory
- https://packetstormsecurity.com/files/142538/MikroTik-RouterBoard-6.38.5-Denial-Of-Service.html x_refsource_MISCExploitThird Party Advisory
- https://www.vulnerability-lab.com/get_content.php?id=2064 x_refsource_MISCExploitThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://seclists.org/fulldisclosure/2017/May/59 | x_refsource_MISCExploitThird Party Advisory | |
| https://cxsecurity.com/issue/WLB-2017050062 | x_refsource_MISCExploitThird Party Advisory | |
| https://packetstormsecurity.com/files/142538/MikroTik-RouterBoard-6.38.5-Denial-Of-Service.html | x_refsource_MISCExploitThird Party Advisory | |
| https://www.vulnerability-lab.com/get_content.php?id=2064 | x_refsource_MISCExploitThird Party Advisory |
Change history (0)
No recorded changes yet.