Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software IPv6 DNS Denial of Service Vulnerability
Published May 6, 2020
8.6
HIGHCVSS 3.1
EPSS 1.86%
Description
A vulnerability in DNS over IPv6 packet processing for Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to unexpectedly reload, resulting in a denial of service (DoS) condition. The vulnerability is due to improper length validation of a field in an IPv6 DNS packet. An attacker could exploit this vulnerability by sending a crafted DNS query over IPv6, which traverses the affected device. An exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. This vulnerability is specific to DNS over IPv6 traffic only.
Affected products
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||
|---|---|---|---|---|---|---|
| Cisco | Cisco Adaptive Security Appliance (ASA) Software | n/a |
|
Configuration 1
- ≥ 6.2.3 · < 6.2.3.16
- ≥ 6.3.0 · < 6.3.0.6
- ≥ 6.4.0 · < 6.4.0.6
Configuration 2
- 9.4\(1\)
- 96.4\(0.42\)
Configuration 3
- 9.4\(1\)
- 96.4\(0.42\)
Configuration 4
- 9.4\(1\)
- 96.4\(0.42\)
Running on/with
- n/a
Configuration 5
- 9.4\(1\)
- 96.4\(0.42\)
Running on/with
- n/a
Configuration 6
- 9.4\(1\)
- 96.4\(0.42\)
Configuration 7
- 9.4\(1\)
- 96.4\(0.42\)
Running on/with
- n/a
Configuration 8
- 9.4\(1\)
- 96.4\(0.42\)
Configuration 9
- 9.4\(1\)
- 96.4\(0.42\)
Running on/with
- n/a
Configuration 10
- 9.4\(1\)
- 96.4\(0.42\)
Configuration 11
- 9.4\(1\)
- 96.4\(0.42\)
Running on/with
- n/a
Configuration 12
- 9.4\(1\)
- 96.4\(0.42\)
Configuration 13
- 9.4\(1\)
- 96.4\(0.42\)
Running on/with
- n/a
Configuration 14
- ≥ 9.6 · < 9.6.4.36
- ≥ 9.8 · < 9.8.4.12
- ≥ 9.9 · < 9.9.2.66
- ≥ 9.10 · < 9.10.1.37
- ≥ 9.12 · < 9.12.2.9
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Nov 15, 2024 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v5
Table of values (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 1.86% (0.01864) | 78.54th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.82% (0.01819) | 75.85th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.16% (0.00160) | 52.99th | v3 (v2023.03.01) |
| Jun 26, 2024 | 0.16% (0.00160) | 52.79th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.16% (0.00160) | 50.78th | 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 | 4.50% (0.04499) | 74.08th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.86% (0.02857) | 63.60th | v1 |
| Jan 6, 2022 | 2.86% (0.02857) | 63.25th | v1 |
| Sep 1, 2021 | 0.65% (0.00651) | 45.91th | v1 |
| Apr 14, 2021 | 0.65% (0.00651) | 0.00th | v1 |
References (1)
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ipv6-67pA658k vendor-advisoryx_refsource_CISCOVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ipv6-67pA658k | vendor-advisoryx_refsource_CISCOVendor Advisory |
Change history (0)
No recorded changes yet.