Security readout for executives and security teams
Plain-English summary
Hitachi Energy MSM v2.2 and earlier has a web-interface flaw that can let a forged link manipulate HTTP responses. A successful attack requires user interaction and an established MSM session, but could expose session cookies or push harmful browser content.
Executive priority
Treat this as a moderate-priority industrial software issue. It is not reported as actively exploited, but systems with reachable MSM web interfaces should be reviewed promptly because attacks target authenticated users and sessions.
Technical view
The issue is CWE-113 HTTP response splitting caused by insufficient validation of data in an HTTP header. CVSS 3.1 is 5.0 with network attack vector, high complexity, no privileges required, user interaction required, unchanged scope, and low confidentiality, integrity, and availability impact.
Likely exposure
Organizations running Hitachi Energy MSM v2.2 or prior are potentially exposed, especially where the MSM web interface is reachable by users through email-linked browsing paths.
Exploitation context
The provided sources do not indicate active exploitation or KEV listing. Exploitation depends on social engineering: an authenticated MSM user clicks a forged MSM web-interface link while a session is active.
Researcher notes
Evidence is limited to the CVE record and referenced vendor advisory URL. Do not assume exploit availability or a specific patch without checking vendor guidance. Focus validation on affected version, interface reachability, and session-exposure risk.
Mitigation direction
- Inventory MSM deployments and identify v2.2 or earlier systems.
- Check Hitachi Energy or ABB advisory guidance for supported remediation.
- Restrict MSM web-interface access to trusted networks or VPN paths.
- Warn MSM users against forged links targeting active web sessions.
- Monitor for suspicious requests and unusual session activity.
Validation and detection
- Confirm MSM product version and web-interface exposure for each deployment.
- Verify whether affected systems are reachable from user workstations or broader networks.
- Review vendor advisory details for fixed versions or compensating controls.
- Check logs for suspicious header-related requests or forged-link reports.
- Confirm session handling and cookie protections are configured as documented.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-113: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-40336 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L1.63.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://search.abb.com/library/Download.aspx?DocumentID=8DBD000085&LanguageCode=en&DocumentPartId=&Action=LaunchCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.