CVE-2021-22731
CRITICALDescription
Weak Password Recovery Mechanism for Forgotten Password vulnerability exists on Modicon Managed Switch MCSESM* and MCSESP* V8.21 and prior which could cause an unauthorized password change through HTTP / HTTPS when basic user information is known by a remote attacker.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
Moderate risk: more likely to be exploited than 70% of all known CVEs.
References
Related Vulnerabilities
Other CWE-640 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2019-18818 | Critical | 9.8 | 98% | - | - |
| CVE-2023-7028 | Critical | 10.0 | 95% | KEV | Fix |
| CVE-2017-7615 | High | 8.8 | 91% | - | - |
| CVE-2024-2862 | Critical | 9.1 | 51% | - | - |
| CVE-2019-19844 | Critical | 9.8 | 35% | - | Fix |
| CVE-2025-6216 | Critical | 9.8 | 35% | - | Fix |
Common questions
How do I fix CVE-2021-22731?
Published advisories record a fix for 16 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2021-22731 being actively exploited?
Not that we know of. CVE-2021-22731 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.4% is the estimated probability that it will be exploited in the next 30 days. That is higher than 70% of all scored CVEs.
How severe is CVE-2021-22731?
CVE-2021-22731 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2021-22731 affect?
Published advisories record a fix for mcsesm043f23f0 firmware (NVD), mcsesm053f1cs0 firmware (NVD), mcsesm053f1cu0 firmware (NVD), mcsesm063f2cs0 firmware (NVD), and 12 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.