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CVE-2021-22124

24
FAUCET Score

CVE-2021-22124 is an uncontrolled resource consumption vulnerability affecting FortiSandbox versions 3.0.0 through 3.2.2 and FortiAuthenticator before 6.0.6. An unauthenticated attacker can trigger a denial of service by sending specially crafted, long request parameters to the login modules, rendering the device unresponsive. Rated with a CVSS score of 7.5 (High), this vulnerability is easily exploitable over the network with low attack complexity, leading to a complete loss of availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.0.0, <= 4.3.4CPE matchmatch criteria
cpe:2.3:a:fortinet:fortiauthenticator:*:*:*:*:*:*:*:*
>= 5.0.0, <= 5.5.0CPE matchmatch criteria
cpe:2.3:a:fortinet:fortiauthenticator:*:*:*:*:*:*:*:*
>= 6.0.0, < 6.0.6CPE matchmatch criteria
cpe:2.3:a:fortinet:fortiauthenticator:*:*:*:*:*:*:*:*
>= 3.0.0, < 3.0.7CPE matchmatch criteria
cpe:2.3:a:fortinet:fortisandbox:*:*:*:*:*:*:*:*
>= 3.1.0, < 3.1.5CPE matchmatch criteria
cpe:2.3:a:fortinet:fortisandbox:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.02%
Probability of exploitation in next 30 days
EPSS Percentile
59.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0102 is in the 36th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

fortinetvendor investigatingvia nvd_reference
View patch

References

fortiguard.com / advisory/FG-IR-20-170
Vendor Advisory