Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Low-Entropy Keys Vulnerability
Published Mar 23, 2023
7.5
HIGHCVSS 3.1
EPSS 0.72%
Description
A vulnerability in the deterministic random bit generator (DRBG), also known as pseudorandom number generator (PRNG), in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software for Cisco ASA 5506-X, ASA 5508-X, and ASA 5516-X Firewalls could allow an unauthenticated, remote attacker to cause a cryptographic collision, enabling the attacker to discover the private key of an affected device. This vulnerability is due to insufficient entropy in the DRBG for the affected hardware platforms when generating cryptographic keys. An attacker could exploit this vulnerability by generating a large number of cryptographic keys on an affected device and looking for collisions with target devices. A successful exploit could allow the attacker to impersonate an affected target device or to decrypt traffic secured by an affected key that is sent to or from an affected target device.
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 |
|
- < 9.12.1
- < 6.4.0
Running on/with
- n/a
- n/a
- n/a
- n/a
- 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:U/C:H/I:N/A:N
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
No CVSS v2.0 score for this CVE.
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 Oct 28, 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
2023–2026- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (8 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.72% (0.00717) | 52.19th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.72% (0.00717) | 48.79th | v5 (v2026.06.15) |
| Jun 13, 2026 | 1.61% (0.01612) | 82.25th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.32% (0.00323) | 53.09th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.14% (0.00137) | 50.75th | v3 (v2023.03.01) |
| Mar 29, 2024 | 0.11% (0.00113) | 43.93th | v3 (v2023.03.01) |
| Apr 6, 2023 | 0.09% (0.00093) | 38.26th | v3 (v2023.03.01) |
| Mar 24, 2023 | 0.05% (0.00048) | 14.69th | v3 (v2023.03.01) |
References (1)
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa5500x-entropy-6v9bHVYP vendor-advisoryVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa5500x-entropy-6v9bHVYP | vendor-advisoryVendor Advisory |
Change history (0)
No recorded changes yet.