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TI-2019-01599 Aliases CVE-2019-1980GHSA-fh23-j4mf-74wm

Cisco Firepower Threat Defense Software Nonstandard Protocol Detection Bypass Vulnerability

Priority LOW 32CWE-264Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-264.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00975 62nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco Firepower Threat Defense Softwareall versions—No fix listedCNA
  • Cisco Firepower Threat Defense Software VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:a:cisco:firepower_services_software_for_asa:*:*:*:*:*:*:*:*all versionsVulnerableCisco
cpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:*2.9.12 – 2.9.12.15; 2.9.13 – 2.9.13.6; 2.9.14.0 – 2.9.14.5VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_management_center:2.9.15:*:*:*:*:*:*:*2.9.15VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_management_center:2.9.16:*:*:*:*:*:*:*2.9.16VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*all versionsVulnerableCisco
  • cpe:2.3:a:cisco:firepower_services_software_for_asa:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:* Versions 2.9.12 – 2.9.12.15; 2.9.13 – 2.9.13.6; 2.9.14.0 – 2.9.14.5 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_management_center:2.9.15:*:*:*:*:*:*:* Versions 2.9.15 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_management_center:2.9.16:*:*:*:*:*:*:* Versions 2.9.16 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Cisco Firepower Threat Defense Software n/a

    3 records Highest priority Priority MEDIUM 1 MEDIUM, 2 LOW

    Other records, highest priority first

    • TI-2019-01598 Cisco Firepower Threat Defense Software Stream Reassembly Bypass VulnerabilityPriority MEDIUM 44
    • TI-2019-01600 Cisco Firepower Threat Defense Software NULL Character Obfuscation Detection Bypass VulnerabilityPriority LOW 34
    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-1980
  2. 2026-10-03 Alias added: GHSA-fh23-j4mf-74wm

References

Advisory 1

  • TI-2019-01598 Cisco Firepower Threat Defense Software Stream Reassembly Bypass Vulnerability CVSS 3.1MEDIUM 5.8
  • TI-2022-05477 Improper access control in Cisco Firepower Management Center CVSS 3.1HIGH 7.5
  • TI-2022-05486 Buffer overflow in Cisco Adaptive Security Appliance Software CVSS 3.1HIGH 7.7
  • TI-2019-01600 Cisco Firepower Threat Defense Software NULL Character Obfuscation Detection Bypass Vulnerability CVSS 3.1MEDIUM 5.8
  • TI-2019-01601 Cisco Firepower Threat Defense Software HTTP Filtering Bypass Vulnerability CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences