CVE-2024-20363

mediumpriority · track · 0EPSS 0.004 · 30 %ileDEEUNLRUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.37% (30th) EPSS

CVSS 5.8 · medium

Is it mine?

24 products

Check your exposure

Who says so?

7 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-26

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco Secure Firewall Threat Defense (FTD) Software 7.4.0 when installed on Cisco Secure Firewall 4200 Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco UTD SNORT IPS Engine Softwarecisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

Technical severity, 0–10. One row per scoring source.

5.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.8mediumAV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · ENISA EU

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · psirt@cisco.com USexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · NCSC-NL NL

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · Cisco PSIRT US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-290USCWE-290USCWE-290US

affected products (24)

Products and version ranges known to be affected.

Cisco Firepowerall versionscert_bundDEcpe:/a:cisco:firepower:-
Cisco Firepower Threat Defense Softwareall versionscert_bundDEcpe:/a:cisco:firepower:threat_defense_software
Cisco Secure Firewall Threat Defense (FTD) Software 7.4.0 when installed on Cisco Secure Firewall 4200 Seriesall versionscisco_csafUS
Cisco Cisco UTD SNORT IPS Engine Softwareall versionscisco_csafUS
Cisco Cisco Firepower Threat Defense Software≤ 7.4.0enisa_euvdEU
Cisco Cisco UTD SNORT IPS Engine Software≤ 17.6.4enisa_euvdEU
Cisco Cisco UTD SNORT IPS Engine Software≤ 17.12.1aenisa_euvdEU
Cisco Cisco UTD SNORT IPS Engine Software≤ 17.12.2enisa_euvdEU
Cisco Cisco UTD SNORT IPS Engine Software≤ 17.6.5enisa_euvdEU
Cisco Systems Inc. Cisco IOS XE17.12 → 17.12.3fstec_bduRU
Cisco Systems Inc. Cisco IOS XE17.13 → 17.13.1fstec_bduRU
Cisco Systems Inc. Firepower Threat Defense≤ 7.4.0fstec_bduRU
Cisco Systems Inc. Snort3.0.0 → 3.1.69.0fstec_bduRU
cisco_firepower_threat_defense_softwareall versionsncsc_nlNLcpe:2.3:a:cisco:cisco_firepower_threat_defense_software:7.4.0:*:*:*:*:*:*:*
cisco_utd_snort_ips_engine_softwareall versionsncsc_nlNLcpe:2.3:a:cisco:cisco_utd_snort_ips_engine_software:17.6.5:*:*:*:*:*:*:*
cisco_utd_snort_ips_engine_softwareall versionsncsc_nlNLcpe:2.3:a:cisco:cisco_utd_snort_ips_engine_software:17.12.1a:*:*:*:*:*:*:*
cisco_utd_snort_ips_engine_softwareall versionsncsc_nlNLcpe:2.3:a:cisco:cisco_utd_snort_ips_engine_software:17.12.2:*:*:*:*:*:*:*
cisco_utd_snort_ips_engine_softwareall versionsncsc_nlNLcpe:2.3:a:cisco:cisco_utd_snort_ips_engine_software:17.6.4:*:*:*:*:*:*:*
cisco secure firewall threat defense= 7.4.0nvdUScpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*
cisco snort3.0.0-233 → 3.1.69.0nvdUScpe:2.3:a:cisco:snort:*:*:*:*:*:*:*:*

showing 20 of 24

advisories (3)

Vendor and ecosystem advisories describing this.

NCSC-2024-0233Kwetsbaarheden verholpen in Cisco productenNL2024-05-23csaf · ncsc_nlNL
Cisco heeft kwetsbaarheden verholpen in ASA, Firepower en Snort.
WID-SEC-W-2024-1223Mehrere Cisco-Produkte: Schwachstelle ermöglicht Umgehung von SicherheitsmaßnahmenDeutsch2024-05-22csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Snort, Cisco Firepower und Cisco IOS XE ausnutzen, um Sicherheitsvorkehrungen zu umgehen.
cisco-sa-snort3-ips-bypass-uE69KBMdMultiple Cisco Products Snort 3 HTTP Intrusion Prevention System Rule Bypass Vulnerability2024-05-22csaf · cisco_csafUS
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. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is part of the May 2024 release of the Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: May 2024 Semiannual Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75298"].

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund cisco_csaf ncsc_nl nvd NVD CVE.org MITRE

published 2024-05-22modified 2026-08-11

references (5)

External citations — patches, advisories, analysis.

scry

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