High severity7.5NVD Advisory· Published May 26, 2021· Updated Jun 17, 2026
CVE-2021-22699
CVE-2021-22699
Description
Improper Input Validation vulnerability exists in Modicon M241/M251 logic controllers firmware prior to V5.1.9.1 that could cause denial of service when specific crafted requests are sent to the controller over HTTP.
Affected products
3<V5.1.9.1+ 1 more
- (no CPE)range: <V5.1.9.1
- cpe:2.3:o:schneider-electric:modicon_m251_firmware:*:*:*:*:*:*:*:*range: <5.1.9.1
- cpe:2.3:o:schneider-electric:modicon_m241_firmware:*:*:*:*:*:*:*:*Range: <5.1.9.1
Patches
Vulnerability mechanics
References
1- download.schneider-electric.com/filesnvdVendor Advisory
News mentions
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