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Fencer Vulns
critical 9.8

CVE-2017-16743 json

An Improper Authorization issue was discovered in PHOENIX CONTACT FL SWITCH 3xxx, 4xxx, and 48xxx Series products running firmware Version…

published 2018-01-12 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-7927

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.1%
EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

An Improper Authorization issue was discovered in PHOENIX CONTACT FL SWITCH 3xxx, 4xxx, and 48xxx Series products running firmware Version 1.0 to 1.32. A remote unauthenticated attacker may be able to craft special HTTP requests allowing an attacker to bypass web-service authentication allowing the attacker to obtain administrative privileges on the device.

Patch / fix

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-18-011-03 updated cvss 9.8

PHOENIX CONTACT FL SWITCH

  • PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 3004T-FX >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 3004T-FX ST >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 3006T-2FX >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 3006T-2FX SM >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 3006T-2FX ST >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 3008 >= 1.0, <= 1.32
    +21 more products
    PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 3008T >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 3012E-2FX SM >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 3012E-2SFX >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 3016 >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 3016E >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 3016T >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 4000T-8POE-2SFP-R >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 4008T-2GT-3FX SM >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 4008T-2GT-4FX SM >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 4008T-2SFP >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 4012T 2GT 2FX >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 4012T-2GT-2FX ST >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 4800E-24FX SM-4GC >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 4800E-24FX-4GC >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 4808E-16FX LC-4GC >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 4808E-16FX SM LC-4GC >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 4808E-16FX SM ST-4GC >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 4808E-16FX SM-4GC >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 4808E-16FX ST-4GC >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 4808E-16FX-4G >= 1.0, <= 1.32 PHOENIX CONTACT, Innominate Security Technologies FL SWITCH 4824E-4GC >= 1.0, <= 1.32
    affected: vendor fix, mitigation “FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher”

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

3.11% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • n/a PHOENIX CONTACT FL SWITCH

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.