Security readout for executives and security teams
Plain-English summary
Nozomi Networks Guardian and CMC versions 20.0.7.3 and earlier have an authenticated command injection issue in the web GUI when administrators change date settings or hostname. A malicious or compromised admin account could execute commands remotely on the appliance.
Executive priority
Treat this as a high-priority remediation for affected OT security monitoring environments. The privilege requirement lowers broad internet risk, but successful abuse could give an attacker command execution on important security infrastructure.
Technical view
The vulnerability is CWE-78 OS command injection reachable through administrative web GUI workflows for date settings or hostname changes. The CVSS 4.0 score is 8.6, with network access, low complexity, no user interaction, but high privileges required.
Likely exposure
Exposure is limited to organizations running Nozomi Networks Guardian or CMC 20.0.7.3 or earlier, especially where the admin web GUI is reachable by broad internal networks or third parties.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Practical exploitation requires authenticated administrator privileges, so compromised admin credentials or malicious insiders are the main concern.
Researcher notes
Key constraints are authenticated administrator access and the specific web GUI date or hostname functions. The bundle identifies affected versions and severity, but does not include exploit telemetry or detailed vendor remediation text beyond the advisory reference.
Mitigation direction
- Upgrade affected Guardian and CMC systems to 20.0.7.4 or later per vendor guidance.
- Review Nozomi Networks advisory NN-2021:1-01 for product-specific remediation details.
- Restrict web GUI access to trusted management networks and authorized administrators.
- Review administrator accounts and remove unnecessary or stale privileged access.
Validation and detection
- Inventory Guardian and CMC deployments and record exact software versions.
- Confirm no deployed Guardian or CMC instance is version 20.0.7.3 or earlier.
- Verify the web GUI is not broadly reachable from untrusted networks.
- Review administrative logs for unexpected date setting or hostname changes.
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-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-26724 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
- High
- CVSS
- 8.6 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.6HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://security.nozominetworks.com/NN-2021:1-01CVE 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 Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.