Vulnerability in Cisco Firepower Threat Defense Software
CVE-2021-34753
A vulnerability 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. This vulnerability is due to incomplete processing during deep packet inspection for ENIP packets. An attacker could exploit this vulnerability 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 trigger and drop for the ENIP packet.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.007 (50.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Cisco Firepower Threat Defense Software
- Cisco Firepower Threat Defense Software — versions 7.0.0
- Cisco Secure Firewall Threat Defense — versions 7.0.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2021-34753?
- CVE-2021-34753 is a medium-severity vulnerability in Cisco Firepower Threat Defense Software, classified under Improper Access Control. CVSS score: 5.8/10. Published 2024-11-15.
- How severe is CVE-2021-34753?
- Medium severity. CVSS v3 base score is 5.8 out of 10.