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CVE-2016-4573

32
FAUCET Score

CVE-2016-4573 describes a critical authentication bypass vulnerability affecting specific Fortinet FortiSwitch models (e.g., FSW-108D-POE, FSW-124D, FSW-448D) running firmware version 3.4.1 in FortiLink managed mode. An attacker can gain administrative access by using an empty password for the "rest_admin" account. With a CVSS score of 9.8 (CRITICAL), this vulnerability is easily exploitable over the network with low attack complexity, leading to complete compromise of confidentiality, integrity, and availability. There is no public exploit code available, nor is there evidence of active exploitation or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.4.1CPE matchmatch criteria
cpe:2.3:o:fortinet:fortiswitch:3.4.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.56%
Probability of exploitation in next 30 days
EPSS Percentile
90.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0456 is in the 84th percentile among its peer group of 36,821 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 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/fortiswitch-rest-admin-account-exposed-under-specific-conditions
Vendor Advisory
themissinglink.com.au / security/advisories/cve-2016-4573
Third Party Advisory
securityfocus.com / bid/92450