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CVE-2021-22123: An OS command injection vulnerability in FortiWeb's management interface 6.3.7 and below, 6.2.3 and below,...

An OS command injection vulnerability in FortiWeb's management interface 6.3.7 and below, 6.2.3 and below, 6.1.x, 6.0.x, 5.9.x may allow a remote authenticated attacker to execute arbitrary commands on the system via the SAML server configuration page.

HighCVSS 7.6Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-22123 is an authenticated command-injection flaw in Fortinet FortiWeb. A user with access to the management interface could abuse the SAML server configuration page to run system commands. The main business risk is appliance compromise affecting availability, integrity, and sensitive configuration data.

Executive priority

Treat this as a high-priority infrastructure remediation item for affected FortiWeb deployments, especially where management access is exposed or shared widely. It requires authentication, but successful abuse could compromise the appliance.

Technical view

The source describes OS command injection in FortiWeb management interface versions 6.3.7 and below, 6.2.3 and below, 6.1.x, 6.0.x, and 5.9.x. CVSS 3.1 is 7.6, with network access, low attack complexity, low privileges, no user interaction, and high availability impact.

Likely exposure

Exposure applies to organizations running the listed FortiWeb versions where an attacker can authenticate to the management interface. The bundle does not identify other Fortinet products as affected.

Exploitation context

The source supports remote authenticated exploitation through the SAML server configuration page. The provided bundle does not show CISA KEV listing or cite active exploitation in the wild.

Researcher notes

Evidence is limited to the CVE description, CVSS vector, affected FortiWeb versions, and Fortinet advisory reference. No exploit status, proof-of-concept details, or fixed-version details are included in the supplied bundle.

Mitigation direction

  • Inventory FortiWeb appliances and identify versions matching the affected ranges.
  • Review Fortinet advisory FG-IR-20-120 for fixed versions and upgrade guidance.
  • Prioritize remediation for internet-reachable or broadly accessible management interfaces.
  • Restrict management-interface access to trusted administrators while remediation is planned.
  • Monitor FortiWeb administrative activity for unexpected SAML configuration changes.

Validation and detection

  • Confirm each FortiWeb appliance version against the affected version ranges.
  • Verify whether the management interface is reachable beyond trusted administrative networks.
  • Review administrative accounts with FortiWeb management access.
  • Check logs for suspicious changes to SAML server configuration.
  • Confirm Fortinet advisory guidance has been applied after remediation.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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.

description · low confidence lookup

Execution 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 lookup
cve · low confidence lookup

CVE-2021-22123 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.6 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
7.6CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H2.84.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.6High
CVSS 3.1 vector shape for CVE-2021-22123Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
FortinetFortinet FortiWebFortiWeb 6.3.7 and below, 6.2.3 and below, 6.1.x, 6.0.x, 5.9.xListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.