Unauthenticated policy bypass via half-open TCP logic error
Published Oct 23, 2024 · Updated Oct 24, 2024
Policy bypass in Cisco Firepower Threat Defense allows remote attackers to pass unintended traffic through affected firewalls. A logic error between TCP Intercept and Snort 3 mishandles crafted patterns of embryonic TCP connections, bypassing configured policy enforcement. Exposure requires Snort 3 and a nondefault maximum embryonic-connection limit; Snort 2 and the default unlimited setting are unaffected.
Summary
What happened
Policy bypass in Cisco Firepower Threat Defense allows remote attackers to pass unintended traffic through affected firewalls. A logic error between TCP Intercept and Snort 3 mishandles crafted patterns of embryonic TCP connections, bypassing configured policy enforcement. Exposure requires Snort 3 and a nondefault maximum embryonic-connection limit; Snort 2 and the default unlimited setting are unaffected.
The record
- CVE
- CVE-2024-20407
- Published
- Oct 23, 2024
- Updated
- Oct 24, 2024
- Vendor
- ClamAV
- Product
- Cisco Firepower Threat Defense
- Classifications
- CWE-399, T1211
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 23, 2024CVE publishedPublication date reported by the CVE source.
- Oct 24, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.2.3
- Affected versionversion=6.2.3.1
- Affected versionversion=6.2.3.10
- Affected versionversion=6.2.3.11
- Affected versionversion=6.2.3.12
- Affected versionversion=6.2.3.13
- Affected versionversion=6.2.3.14
- Affected versionversion=6.2.3.15
- Affected versionversion=6.2.3.16
- Affected versionversion=6.2.3.17
- Affected versionversion=6.2.3.18
- Affected versionversion=6.2.3.2
- Affected versionversion=6.2.3.3
- Affected versionversion=6.2.3.4
- Affected versionversion=6.2.3.5
- Affected versionversion=6.2.3.6
- Affected versionversion=6.2.3 <=6.2.3.18
- Affected versionversion=6.2.3.7
- Affected versionversion=6.2.3.8
- Affected versionversion=6.2.3.9
- Affected versionversion=6.4.0
- Affected versionversion=6.4.0.1
- Affected versionversion=6.4.0.10
- Affected versionversion=6.4.0.11
- Affected versionversion=6.4.0.12
- Affected versionversion=6.4.0.13
- Affected versionversion=6.4.0.14
- Affected versionversion=6.4.0.15
- Affected versionversion=6.4.0.16
- Affected versionversion=6.4.0.17
- Affected versionversion=6.4.0.18
- Affected versionversion=6.4.0.2
- Affected versionversion=6.4.0.3
- Affected versionversion=6.4.0.4
- Affected versionversion=6.4.0.5
- Affected versionversion=6.4.0.6
- Affected versionversion=6.4.0 <=6.4.0.18
- Affected versionversion=6.4.0.7
- Affected versionversion=6.4.0.8
- Affected versionversion=6.4.0.9
- Affected versionversion=6.6.0
- Affected versionversion=6.6.0.1
- Affected versionversion=6.6.0 <=6.6.7.2
- Affected versionversion=6.6.1
- Affected versionversion=6.6.3
- Affected versionversion=6.6.4
- Affected versionversion=6.6.5
- Affected versionversion=6.6.5.1
- Affected versionversion=6.6.5.2
- Affected versionversion=6.6.7
- Affected versionversion=6.6.7.1
- Affected versionversion=6.6.7.2
- Affected versionversion=6.7.0
- Affected versionversion=6.7.0.1
- Affected versionversion=6.7.0.2
- Affected versionversion=6.7.0.3
- Affected versionversion=6.7.0 <=6.7.0.3
- Affected versionversion=7.0.0
- Affected versionversion=7.0.0.1
- Affected versionversion=7.0.0 <=7.0.6.2
- Affected versionversion=7.0.1
- Affected versionversion=7.0.1.1
- Affected versionversion=7.0.2
- Affected versionversion=7.0.2.1
- Affected versionversion=7.0.3
- Affected versionversion=7.0.4
- Affected versionversion=7.0.5
- Affected versionversion=7.0.6
- Affected versionversion=7.0.6.1
- Affected versionversion=7.0.6.2
- Affected versionversion=7.1.0
- Affected versionversion=7.1.0.1
- Affected versionversion=7.1.0.2
- Affected versionversion=7.1.0.3
- Affected versionversion=7.1.0 <=7.1.0.3
- Affected versionversion=7.2.0
- Affected versionversion=7.2.0.1
- Affected versionversion=7.2.0 <=7.2.8.1
- Affected versionversion=7.2.1
- Affected versionversion=7.2.2
- Affected versionversion=7.2.3
- Affected versionversion=7.2.4
- Affected versionversion=7.2.4.1
- Affected versionversion=7.2.5
- Affected versionversion=7.2.5.1
- Affected versionversion=7.2.5.2
- Affected versionversion=7.2.6
- Affected versionversion=7.2.7
- Affected versionversion=7.2.8
- Affected versionversion=7.2.8.1
- Affected versionversion=7.3.0
- Affected versionversion=7.3.0 <=7.3.1.2
- Affected versionversion=7.3.1
- Affected versionversion=7.3.1.1
- Affected versionversion=7.3.1.2
- Affected versionversion=7.4.0
- Affected versionversion=7.4.0 <=7.4.1.1
- Affected versionversion=7.4.1
- Affected versionversion=7.4.1.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo