Security readout for executives and security teams
Plain-English summary
CVE-2021-27758 is a login-form CSRF issue in HCL BigFix Inventory 9.x and 10.x. An attacker could spam login attempts in a way that blocks a victim account from logging in, creating a limited availability impact rather than data theft or system takeover.
Executive priority
Treat as a moderate operational risk for environments running affected HCL BigFix Inventory versions. Prioritize validation and vendor-guided remediation because the likely business impact is denied access to user accounts, not data compromise.
Technical view
The record maps to CWE-352 and has CVSS 3.1 score 4.3. The vector indicates adjacent attack vector, low complexity, no privileges, no user interaction, no confidentiality or integrity impact, and low availability impact. The described outcome is account blocking after attacker-driven login spam.
Likely exposure
Organizations using HCL BigFix Inventory 9.x or 10.x are the relevant exposure group. The CVSS vector suggests adjacent-network reachability, but the source bundle does not provide deployment prerequisites, fixed builds, or detailed configuration conditions.
Exploitation context
The CVE is not listed as KEV in the provided bundle. The CVSS temporal metric includes functional exploit maturity, but the provided sources do not show active exploitation, public campaign activity, or weaponized details.
Researcher notes
Evidence is limited to the CVE description, CVSS vector, CWE classification, affected product versions, and HCL advisory reference. Do not infer broader BigFix components, internet exploitability, or specific patched versions from this bundle alone.
Mitigation direction
- Check HCL advisory KB0098006 for official affected and fixed versions.
- Upgrade or apply remediation only as directed by HCL guidance.
- Restrict BigFix Inventory login access to trusted network paths where feasible.
- Monitor repeated failed login attempts and account lockout patterns.
- Review account lockout thresholds for operational resilience.
Validation and detection
- Inventory HCL BigFix Inventory 9.x and 10.x installations.
- Compare installed builds against HCL KB0098006 guidance.
- Confirm login forms have CSRF protection in authorized testing.
- Review authentication logs for repeated login spam against user accounts.
- Verify account lockout recovery procedures are documented and tested.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-352: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-27758 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
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:F/RL:U/RC:C/CR:L/IR:L/AR:L/MAV:A/MAC:L/MPR:N/MUI:N/MS:U/MC:N/MI:N/MA: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:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:F/RL:U/RC:C/CR:L/IR:L/AR:L/MAV:A/MAC:L/MPR:N/MUI:N/MS:U/MC:N/MI:N/MA:L2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:F/RL:U/RC:C/CR:L/IR:L/AR:L/MAV:A/MAC:L/MPR:N/MUI:N/MS:U/MC:N/MI:N/MA:L
Source materials
- CVE List V5 sourceCVE List V5
- https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0098006CVE reference · x_refsource_MISC
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.
Cross-Site Request Forgery (CSRF)
Cross-Site Request Forgery (CSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.