How severe is CVE-2024-8403?

CVE-2024-8403 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2024-8403 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2024-8403?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2024-8403 have an EU (EUVD) identifier?

Yes. CVE-2024-8403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-49627.

When was CVE-2024-8403 published?

CVE-2024-8403 was published on 2024-11-19 and last updated on 2026-06-17.

CVE-2024-8403

CVE-2024-8403 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1287.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-49627
Weakness: CWE-1287
Published: 2024-11-19
Last modified: 2026-06-17

Description

Improper Validation of Specified Type of Input vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET versions 1.100 to 1.200 and FX5-ENET/IP versions 1.100 to 1.104 allows a remote attacker to cause a Denial of Service condition in Ethernet communication of the products by sending specially crafted SLMP packets.

Frequently asked questions

What is CVE-2024-8403?: Improper Validation of Specified Type of Input vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET versions 1.100 to 1.200 and FX5-ENET/IP versions 1.100 to 1.104 allows a remote attacker to cause a Denial of Service condition in Ethernet communication of the products by sending specially crafted SLMP packets.
How severe is CVE-2024-8403?: CVE-2024-8403 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2024-8403 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2024-8403?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2024-8403 have an EU (EUVD) identifier?: Yes. CVE-2024-8403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-49627.
When was CVE-2024-8403 published?: CVE-2024-8403 was published on 2024-11-19 and last updated on 2026-06-17.

References

Other CWE-1287 vulnerabilities

CVE-2024-51550 — Critical (CVSS 10.0): Data Validation / Data Sanitization vulnerabilities in Linux allows unvalidated and unsanitized data to be injected in…
CVE-2024-6298 — Critical (CVSS 10.0): Unauthorized file access in WEB Server in ABB ASPECT - Enterprise v3.08.01; NEXUS Series v3.08.01 ; MATRIX Series…
CVE-2026-44935 — Critical (CVSS 9.9): Missing validation of "valuesFrom" references in Helm Deployer of SUSE Rancher Fleet 0.15 before 0.15.2, 0.14 before…
CVE-2024-4879 — Critical (CVSS 9.8): ServiceNow has addressed an input validation vulnerability that was identified in Vancouver and Washington DC Now…
CVE-2021-32024 — Critical (CVSS 9.8): A remote code execution vulnerability in the BMP image codec of BlackBerry QNX SDP version(s) 6.4 to 7.1 could allow an…
CVE-2026-24307 — Critical (CVSS 9.3): Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information…

Browse all CWE-1287 vulnerabilities →