Is CVE-2021-40336 actively exploited?

No active exploitation of CVE-2021-40336 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-40336 be exploited remotely?

Yes. CVE-2021-40336 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-40336?

CVE-2021-40336 has a CVSS score of 8.8 (HIGH).

HOME VULNERABILITIESCVE-2021-40336

HIGH

CVE-2021-40336

CWE-113Published: July 25, 2022· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-40336 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.