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High severity · published May 26, 2021
CVE-2021-22699
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…
7.5
CVSS
1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 62% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MM
Modicon M241 Firmware · Schneider-electric
before 5.1.9.1 · source: NVD
MM
Modicon M251 Firmware · Schneider-electric
before 5.1.9.1 · source: NVD
Affected product
MM
Modicon M241 Firmware
Schneider-electric
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-22699
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-22699
Vendor Advisory
https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-130-05
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