Cisco Firepower 1000 Series SSL/TLS Denial of Service Vulnerability
Published May 6, 2020
8.6
HIGHCVSS 3.1
EPSS 2.00%
Description
A vulnerability in the Secure Sockets Layer (SSL)/Transport Layer Security (TLS) handler of Cisco Firepower Threat Defense (FTD) Software when running on the Cisco Firepower 1000 Series platform could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition on an affected device. The vulnerability is due to a communication error between internal functions. An attacker could exploit this vulnerability by sending a crafted SSL/TLS message to an affected device. A successful exploit could allow the attacker to cause a buffer underrun, which leads to a crash. The crash causes the affected device to reload.
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 Firepower Threat Defense Software | n/a |
|
Configuration 1
- ≥ 6.4.0 · < 6.4.0.9
Running on/with
- n/a
- n/a
- n/a
- n/a
Configuration 2
- 9.12\(2.12\)
- 9.13\(0.33\)
Configuration 3
- 9.12\(2.12\)
- 9.13\(0.33\)
Configuration 4
- 9.12\(2.12\)
- 9.13\(0.33\)
Running on/with
- n/a
Configuration 5
- 9.12\(2.12\)
- 9.13\(0.33\)
Running on/with
- n/a
Configuration 6
- 9.12\(2.12\)
- 9.13\(0.33\)
Configuration 7
- 9.12\(2.12\)
- 9.13\(0.33\)
Running on/with
- n/a
Configuration 8
- 9.12\(2.12\)
- 9.13\(0.33\)
Configuration 9
- 9.12\(2.12\)
- 9.13\(0.33\)
Running on/with
- n/a
Configuration 10
- 9.12\(2.12\)
- 9.13\(0.33\)
Configuration 11
- 9.12\(2.12\)
- 9.13\(0.33\)
Running on/with
- n/a
Configuration 12
- 9.12\(2.12\)
- 9.13\(0.33\)
Configuration 13
- 9.12\(2.12\)
- 9.13\(0.33\)
Running on/with
- n/a
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 3, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (16 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 2.00% (0.02005) | 80.09th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.96% (0.01956) | 77.60th | v5 (v2026.06.15) |
| Mar 29, 2025 | 1.83% (0.01832) | 71.80th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.23% (0.00227) | 61.36th | v3 (v2023.03.01) |
| Jun 14, 2024 | 0.23% (0.00227) | 61.09th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.23% (0.00227) | 59.08th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | 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 |
| Oct 11, 2021 | 0.65% (0.00651) | 46.27th | v1 |
| Oct 10, 2021 | 2.86% (0.02857) | 80.42th | v5 (v2026.06.15) |
| Sep 18, 2021 | 2.86% (0.02857) | 80.62th | 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-ftd-tls-dos-4v5nmWtZ vendor-advisoryx_refsource_CISCOVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tls-dos-4v5nmWtZ | vendor-advisoryx_refsource_CISCOVendor Advisory |
Change history (0)
No recorded changes yet.