How severe is CVE-2021-40336?

CVE-2021-40336 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2021-40336 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40336?

CVE-2021-40336 affects Hitachienergy Modular Switchgear Monitoring Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40336?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-40336 published?

CVE-2021-40336 was published on 2022-07-25 and last updated on 2026-06-17.

CVE-2021-40336

CVE-2021-40336 is a medium-severity vulnerability in Hitachienergy Modular Switchgear Monitoring Firmware with a CVSS 3.x base score of 5.0. 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-74.

Key facts

Severity: Medium (CVSS 3.x base score 5.0)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Hitachienergy Modular Switchgear Monitoring Firmware
Published: 2022-07-25
Last modified: 2026-06-17

Description

A vulnerability exists in the http web interface where the web interface does not validate data in an HTTP header. This causes a possible HTTP response splitting, which if exploited could lead an attacker to channel down harmful code into the user’s web browser, such as to steal the session cookies. Thus, an attacker who successfully makes an MSM user who has already established a session to MSM web interface clicks a forged link to the MSM web interface, e.g., the link is sent per E-Mail, could trick the user into downloading malicious software onto his computer. This issue affects: Hitachi Energy MSM V2.2 and prior versions.

Frequently asked questions

What is CVE-2021-40336?: A vulnerability exists in the http web interface where the web interface does not validate data in an HTTP header. This causes a possible HTTP response splitting, which if exploited could lead an attacker to channel down harmful code into the user’s web browser, such as to steal the session cookies. Thus, an attacker who successfully makes an MSM user who has already established a session to MSM web interface clicks a forged link to the MSM web interface, e.g., the link is sent per E-Mail, could trick the user into downloading malicious software onto his computer. This issue affects: Hitachi Energy MSM V2.2 and prior versions.
How severe is CVE-2021-40336?: CVE-2021-40336 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2021-40336 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40336?: CVE-2021-40336 affects Hitachienergy Modular Switchgear Monitoring Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40336?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-40336 published?: CVE-2021-40336 was published on 2022-07-25 and last updated on 2026-06-17.

References

https://search.abb.com/library/Download.aspx?DocumentID=8DBD000085&LanguageCode=en&DocumentPartId=&Action=Launch

Affected products (1)

cpe:2.3:o:hitachienergy:modular_switchgear_monitoring_firmware:*:*:*:*:*:*:*:*

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