Cisco Firepower Threat Defense Software Nonstandard Protocol Detection Bypass Vulnerability
Published Nov 5, 2019
5.3
MEDIUMCVSS 3.1
EPSS 0.97%
Description
A vulnerability in the protocol detection component of Cisco Firepower Threat Defense Software, Cisco FirePOWER Services Software for ASA, and Cisco Firepower Management Center Software could allow an unauthenticated, remote attacker to bypass filtering protections. The vulnerability is due to improper detection of the initial use of a protocol on a nonstandard port. An attacker could exploit this vulnerability by sending traffic on a nonstandard port for the protocol in use through an affected device. An exploit could allow the attacker to bypass filtering and deliver malicious requests to protected systems that would otherwise be blocked. Once the initial protocol flow on the nonstandard port is detected, future flows on the nonstandard port will be successfully detected and handled as configured by the applied policy.
Affected products
-
- Version unspecifiedStatusaffectedConstraints-
- Version
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 |
|
- n/a
- ≥ 2.9.12 · ≤ 2.9.12.15
- ≥ 2.9.13 · ≤ 2.9.13.6
- ≥ 2.9.14.0 · ≤ 2.9.14.5
- 2.9.15
- 2.9.16
- 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:N/I:L/A:N
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
AV:N/AC:L/Au:N/C:N/I:P/A:N
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 19, 2024 · SSVC 2.0.3
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 v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.97% (0.00975) | 60.73th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.97% (0.00975) | 60.58th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.13% (0.00126) | 47.88th | v3 (v2023.03.01) |
| Jun 13, 2024 | 0.13% (0.00126) | 47.53th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.13% (0.00126) | 45.53th | 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 | 2.30% (0.02304) | 53.71th | v1 |
| Jan 6, 2022 | 2.30% (0.02304) | 53.25th | v1 |
| Jan 5, 2022 | 0.52% (0.00523) | 33.47th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.52% (0.00523) | 0.00th | v1 |
References (1)
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190816-ftd-nspd vendor-advisoryx_refsource_CISCOVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190816-ftd-nspd | vendor-advisoryx_refsource_CISCOVendor Advisory |
Change history (0)
No recorded changes yet.