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CVE Record

CVE-2021-22130: A stack-based buffer overflow vulnerability in FortiProxy physical appliance CLI 2.0.0 to 2.0.1, 1.2.0 to 1...

A stack-based buffer overflow vulnerability in FortiProxy physical appliance CLI 2.0.0 to 2.0.1, 1.2.0 to 1.2.9, 1.1.0 to 1.1.6, 1.0.0 to 1.0.7 may allow an authenticated, remote attacker to perform a Denial of Service attack by running the `diagnose sys cpuset` with a large cpuset mask value. Fortinet is not aware of any successful exploitation of this vulnerability that would lead to code execution.

MediumCVSS 6.7Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This affects Fortinet FortiProxy physical appliances running specific older versions. A highly privileged authenticated user could crash or disrupt the appliance through the CLI. The provided sources do not support active exploitation or confirmed code execution.

Executive priority

Treat this as a moderate-priority infrastructure hardening issue. It is less urgent than internet-exploited edge vulnerabilities, but affected appliances should be upgraded or access-restricted because disruption of proxy infrastructure can affect business operations.

Technical view

CVE-2021-22130 is a stack-based buffer overflow in the FortiProxy physical appliance CLI. Affected versions are 2.0.0-2.0.1, 1.2.0-1.2.9, 1.1.0-1.1.6, and 1.0.0-1.0.7. CVSS is 6.7. The source describes denial of service risk and notes no known successful code execution.

Likely exposure

Exposure is limited to organizations running affected FortiProxy physical appliance versions with authenticated CLI access available to administrators or highly privileged users.

Exploitation context

The CVE is not listed as KEV in the bundle. The source does not claim active exploitation. Exploitation requires authenticated, high-privilege CLI access according to the supplied CVSS vector and description.

Researcher notes

The bundle identifies a CLI-triggered stack buffer overflow with DoS impact. CVSS lists high confidentiality, integrity, and availability impact, but the description only substantiates DoS and says Fortinet is unaware of successful code execution. Fix details are not included in the provided text.

Mitigation direction

  • Identify FortiProxy physical appliances and their running versions.
  • Upgrade or remediate according to Fortinet advisory FG-IR-21-006.
  • Restrict CLI access to trusted administrative users only.
  • Review administrative account hygiene and remove unnecessary privileges.
  • Monitor vendor guidance for any updated mitigation or fix details.

Validation and detection

  • Confirm whether any appliance runs the listed vulnerable FortiProxy versions.
  • Verify CLI access is limited to authorized administrators.
  • Review administrative logs for unusual diagnostic activity or appliance crashes.
  • Confirm remediation status against Fortinet advisory FG-IR-21-006.
  • Document any remaining affected systems and compensating controls.
Prepared
Confidence
medium
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-2021-22130 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
Medium
CVSS
6.7 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/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
6.7CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H0.85.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.7Medium
CVSS 3.1 vector shape for CVE-2021-22130Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/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 FortiProxyFortiProxy 2.0.0 to 2.0.1, 1.2.0 to 1.2.9, 1.1.0 to 1.1.6, 1.0.0 to 1.0.7Listed
Weakness

CWE details

No CWE listed

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