How severe is CVE-2021-22731?

CVE-2021-22731 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-22731 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-22731?

CVE-2021-22731 primarily affects Schneider-electric Mcsesp083f23g0 Firmware. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-22731?

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

When was CVE-2021-22731 published?

CVE-2021-22731 was published on 2021-05-26 and last updated on 2026-06-17.

CVE-2021-22731

CVE-2021-22731 is a critical-severity vulnerability in Schneider-electric Mcsesp083f23g0 Firmware with a CVSS 3.x base score of 9.8. 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-640.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-640
Affected product: Schneider-electric Mcsesp083f23g0 Firmware
Published: 2021-05-26
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-22731?: 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 severe is CVE-2021-22731?: CVE-2021-22731 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-22731 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-22731?: CVE-2021-22731 primarily affects Schneider-electric Mcsesp083f23g0 Firmware. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-22731?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-22731 published?: CVE-2021-22731 was published on 2021-05-26 and last updated on 2026-06-17.

References

https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-130-01

Affected products (16)

cpe:2.3:o:schneider-electric:mcsesp083f23g0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:mcsesp083f23g0t_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:mcsesm043f23f0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:mcsesm053f1cu0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:mcsesm063f2cu0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:mcsesm053f1cs0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:mcsesm063f2cs0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:mcsesm083f23f0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:mcsesm103f2cu0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:mcsesm083f23f0h_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:mcsesm103f2cu0h_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:mcsesm103f2cs0h_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:mcsesm123f2lg0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:mcsesm093f1cu0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:mcsesm093f1cs0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:mcsesm103f2cs0_firmware:*:*:*:*:*:*:*:*

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