The packet-reassembly implementation in Cisco IOS XE 3.13S and earlier allows remote attackers to cause a denial of service (CPU consumption or packet loss) via fragmented (1) IPv4 or (2) IPv6 packets that trigger ATTN-3-SYNC_TIMEOUT errors after reassembly failures, aka Bug ID CSCuo37957
Published Jul 30, 2015
5.0
MEDIUMCVSS 2.0
EPSS 1.81%
Description
The packet-reassembly implementation in Cisco IOS XE 3.13S and earlier allows remote attackers to cause a denial of service (CPU consumption or packet loss) via fragmented (1) IPv4 or (2) IPv6 packets that trigger ATTN-3-SYNC_TIMEOUT errors after reassembly failures, aka Bug ID CSCuo37957.
Affected products
No data.
- 2.1.0
- 2.1.1
- 2.1.2
- 2.2.1
- 2.2.2
- 2.2.3
- 2.3.0
- 2.3.0t
- 2.3.1t
- 2.3.2
- 2.4.0
- 2.4.1
- 2.5.0
- 2.5.1
- 2.5.2
- 2.6.0
- 2.6.1
- 2.6.2
- 3.10s.0
- 3.10s.0a
- 3.10s.1
- 3.10s.2
- 3.10s.3
- 3.11s.0
- 3.11s.1
- 3.11s.2
- 3.12s.0
- 3.12s.1
- 3.13s.0
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
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:P
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 (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.81% (0.01811) | 77.83th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.81% (0.01811) | 75.73th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.92% (0.00923) | 74.39th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.19% (0.00186) | 57.24th | v3 (v2023.03.01) |
| Jul 10, 2024 | 0.19% (0.00186) | 56.24th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.19% (0.00186) | 54.19th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.05% (0.01055) | 50.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.05% (0.01055) | 48.43th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.05% (0.01055) | 27.52th | v2 (v2022.01.01) |
References (2)
- http://tools.cisco.com/security/center/viewAlert.x?alertId=40215 vendor-advisoryx_refsource_CISCOVendor Advisory
- http://www.securitytracker.com/id/1033122 vdb-entryx_refsource_SECTRACK
| Link | Providers | Tags |
|---|---|---|
| http://tools.cisco.com/security/center/viewAlert.x?alertId=40215 | vendor-advisoryx_refsource_CISCOVendor Advisory | |
| http://www.securitytracker.com/id/1033122 | vdb-entryx_refsource_SECTRACK |
Change history (0)
No recorded changes yet.