Medium severity5.8NVD Advisory· Published Oct 27, 2021· Updated Aug 11, 2026

CVE-2021-34754

Description

Multiple vulnerabilities in the payload inspection for Ethernet Industrial Protocol (ENIP) traffic for Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured rules for ENIP traffic. These vulnerabilities are due to incomplete processing during deep packet inspection for ENIP packets. An attacker could exploit these vulnerabilities by sending a crafted ENIP packet to the targeted interface. A successful exploit could allow the attacker to bypass configured access control and intrusion policies that should be activated for the ENIP packet.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Cisco Systems, Inc./Secure Firewall Management Center5 versions
cpe:2.3:a:cisco:secure_firewall_management_center:2.9.12:*:*:*:*:*:*:*+ 4 more
- cpe:2.3:a:cisco:secure_firewall_management_center:2.9.12:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:secure_firewall_management_center:2.9.14.0:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:secure_firewall_management_center:2.9.16:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:secure_firewall_management_center:2.9.17:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:secure_firewall_management_center:2.9.18:*:*:*:*:*:*:*
Cisco Systems, Inc./Secure Firewall Threat Defense
cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*
Range: >=6.4.0,<6.4.0.13
Cisco Systems, Inc./Firepower Threat Defense Softwarellm-fuzzy2 versions
(expand)+ 1 more
- (no CPE)
- (no CPE)range: n/a

Patches

Vulnerability mechanics

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-enip-bypass-eFsxd8KPnvdVendor Advisory

News mentions

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cvss	0.377
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000