VulnerabilityModified

CVE-2021-22787

A CWE-20: Improper Input Validation vulnerability exists that could cause denial of service of the device when an attacker sends a specially crafted HTTP request to the web server of the device.

HIGH 7.5EPSS 1.04%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (1.04%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

A CWE-20: Improper Input Validation vulnerability exists that could cause denial of service of the device when an attacker sends a specially crafted HTTP request to the web server of the device. Affected Product: Modicon M340 CPUs: BMXP34 (Versions prior to V3.40), Modicon M340 X80 Ethernet Communication Modules: BMXNOE0100 (H), BMXNOE0110 (H), BMXNOC0401, BMXNOR0200H RTU (All Versions), Modicon Premium Processors with integrated Ethernet (Copro): TSXP574634, TSXP575634, TSXP576634 (All Versions), Modicon Quantum Processors with Integrated Ethernet (Copro): 140CPU65xxxxx (All Versions), Modicon Quantum Communication Modules: 140NOE771x1, 140NOC78x00, 140NOC77101 (All Versions), Modicon Premium Communication Modules: TSXETY4103, TSXETY5103 (All Versions)

CVSS 3.1: 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 1.04% probability · 62th percentile
CISA KEV: Not listed
Weakness: CWE-20
Affected: schneider-electric/modicon m340 bmxp342020 firmware · schneider-electric/bmxnoe0100 firmware · schneider-electric/bmxnoe0110 firmware · schneider-electric/bmxnoc0401 firmware · schneider-electric/bmxnor0200h rtu firmware · schneider-electric/tsxp574634 firmware · schneider-electric/tsxp575634 firmware · schneider-electric/tsxp576634 firmware · schneider-electric/140cpu65150 firmware · schneider-electric/140noe771x1 firmware · schneider-electric/140noc78x00 firmware · schneider-electric/140noc77101 firmware · schneider-electric/tsxety4103 firmware · schneider-electric/tsxety5103 firmware
Source: cybersecurity@se.com

References

https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-257-02Patch, Vendor Advisory
https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-257-02Patch, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.