CVE-2024-20363

Multiple Cisco products are affected by a vulnerability in the Snort Intrusion Prevention System (IPS) rule engine that could allow an unauthenticated, remote attacker to bypass the configured rules on an affected system. This vulnerability is due to incorrect HTTP packet handling. An attacker could exploit this vulnerability by sending crafted HTTP packets through an affected device. A successful exploit could allow the attacker to bypass configured IPS rules and allow uninspected traffic onto the network.

Published: 2024-05-22 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-20363 is rated Low Risk (33.3/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.37%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-20363

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.14% 0.37% +0.22%
2 2025-07-27 0.28% 0.14% -0.14%
3 2025-07-06 — 0.28% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-20363

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.8 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]

Weakness enumeration for CVE-2024-20363

Affected software / configurations for CVE-2024-20363

Vendor Product Version Raw CPE
cisco firepower_threat_defense 7.4.0 cpe:2.3:a:cisco:firepower_threat_defense:7.4.0:*:*:*:*:*:*:*
cisco unified_threat_defense_snort_intrusion_prevention_system_engine 17.6.4 cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.6.4:*:*:*:*:*:*:*
cisco unified_threat_defense_snort_intrusion_prevention_system_engine 17.6.5 cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.6.5:*:*:*:*:*:*:*
cisco unified_threat_defense_snort_intrusion_prevention_system_engine 17.12.1a cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.12.1a:*:*:*:*:*:*:*
cisco unified_threat_defense_snort_intrusion_prevention_system_engine 17.12.2 cpe:2.3:o:cisco:unified_threat_defense_snort_intrusion_prevention_system_engine:17.12.2:*:*:*:*:*:*:*
cisco snort >= 3.0.0-233, < 3.1.69.0 cpe:2.3:a:cisco:snort:*:*:*:*:*:*:*:*

References for CVE-2024-20363

cvelogic Threat Intelligence