CVE-2017-16743

highpriority · track · 40OT risk · elevatedEPSS 0.031 · 88 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

3.11% (88th) EPSS

CVSS 10 · high

Is it mine?

173 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedphoenix_contact_psirt
Customers using PHOENIX CONTACT FL SWITCH 3xxx series, FL SWITCH 4xxx series, and FL SWITCH 48xx series devices with firmware versions up to 1.32 are recommended to update to firmware version 1.33 or higher, which fixes these vulnerabilities. The updated firmware may be downloaded from the following managed switch product pages on the vendor's website: | Article No. | Model | Updated Firmware | |-------------|-----------------------------|-----------------------------------------------------------------------------------------------------| | 2891030 | FL SWITCH 3005 | [Firmware Update](http://www.phoenixcontact.net/qr/2891030/firmware_update) | | 2891032 | FL SWITCH 3005T | [Firmware Update](http://www.phoenixcontact.net/qr/2891032/firmware_update) | | 2891033 | FL SWITCH 3004T-FX | [Firmware Update](http://www.phoenixcontact.net/qr/2891033/firmware_update) | | 2891034 | FL SWITCH 3004T-FX ST | [Firmware Update](http://www.phoenixcontact.net/qr/2891034/firmware_update) | | 2891031 | FL SWITCH 3008 | [Firmware Update](http://www.phoenixcontact.net/qr/2891031/firmware_update) | | 2891035 | FL SWITCH 3008T | [Firmware Update](http://www.phoenixcontact.net/qr/2891035/firmware_update) | | 2891036 | FL SWITCH 3006T-2FX | [Firmware Update](http://www.phoenixcontact.net/qr/2891036/firmware_update) | | 2891037 | FL SWITCH 3006T-2FX ST | [Firmware Update](http://www.phoenixcontact.net/qr/2891037/firmware_update) | | 2891067 | FL SWITCH 3012E-2SFX | [Firmware Update](http://www.phoenixcontact.net/qr/2891067/firmware_update) | | 2891066 | FL SWITCH 3016E | [Firmware Update](http://www.phoenixcontact.net/qr/2891066/firmware_update) | | 2891058 | FL SWITCH 3016 | [Firmware Update](http://www.phoenixcontact.net/qr/2891058/firmware_update) | | 2891059 | FL SWITCH 3016T | [Firmware Update](http://www.phoenixcontact.net/qr/2891059/firmware_update) | | 2891060 | FL SWITCH 3006T-2FX SM | [Firmware Update](http://www.phoenixcontact.net/qr/2891060/firmware_update) | | 2891062 | FL SWITCH 4008T-2SFP | [Firmware Update](http://www.phoenixcontact.net/qr/2891062/firmware_update) | | 2891061 | FL SWITCH 4008T-2GT-4FX SM | [Firmware Update](http://www.phoenixcontact.net/qr/2891061/firmware_update) | | 2891160 | FL SWITCH 4008T-2GT-3FX SM | [Firmware Update](http://www.phoenixcontact.net/qr/2891160/firmware_update) | | 2891073 | FL SWITCH 4808E-16FX LC-4GC | [Firmware Update](http://www.phoenixcontact.net/qr/2891073/firmware_update) | | 2891080 | FL SWITCH 4808E-16FX SM-4GC | [Firmware Update](http://www.phoenixcontact.net/qr/2891080/firmware_update) | | 2891086 | FL SWITCH 4808E-16FX SM ST-4GC | [Firmware Update](http://www.phoenixcontact.net/qr/2891086/firmware_update) | | 2891085 | FL SWITCH 4808E-16FX ST-4GC | [Firmware Update](http://www.phoenixcontact.net/qr/2891085/firmware_update) | | 2891079 | FL SWITCH 4808E-16FX-4GC | [Firmware Update](http://www.phoenixcontact.net/qr/2891079/firmware_update) | | 2891074 | FL SWITCH 4808E-16FX SM LC-4GC | [Firmware Update](http://www.phoenixcontact.net/qr/2891074/firmware_update) | | 2891063 | FL SWITCH 4012T 2GT 2FX | [Firmware Update](http://www.phoenixcontact.net/qr/2891063/firmware_update) | | 2891161 | FL SWITCH 4012T-2GT-2FX ST | [Firmware Update](http://www.phoenixcontact.net/qr/2891161/firmware_update) | | 2891072 | FL SWITCH 4824E-4GC | [Firmware Update](http://www.phoenixcontact.net/qr/2891072/firmware_update) | | 2891102 | FL SWITCH 4800E-24FX-4GC | [Firmware Update](http://www.phoenixcontact.net/qr/2891102/firmware_update) | | 2891104 | FL SWITCH 4800E-24FX SM-4GC | [Firmware Update](http://www.phoenixcontact.net/qr/2891104/firmware_update) | | 2891120 | FL SWITCH 3012E-2FX | [Firmware Update](http://www.phoenixcontact.net/qr/2891120/firmware_update) | | 2891119 | FL SWITCH 3012E-2FX SM | [Firmware Update](http://www.phoenixcontact.net/qr/2891119/firmware_update) | | 2891162 | FL SWITCH 4000T-8POE-2SFP-R | Please contact your local customer service |
FixedFL SWITCH 3004T-FXcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 3004T-FX STcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 3006T-2FXcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 3006T-2FX SMcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 3006T-2FX STcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 3008cisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 3008Tcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 3012E-2FX SMcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 3012E-2SFXcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 3016cisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 3016Ecisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 3016Tcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 4000T-8POE-2SFP-Rcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 4008T-2GT-3FX SMcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 4008T-2GT-4FX SMcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 4008T-2SFPcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 4012T 2GT 2FXcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 4012T-2GT-2FX STcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 4800E-24FX SM-4GCcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 4800E-24FX-4GCcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 4808E-16FX LC-4GCcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 4808E-16FX SM LC-4GCcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 4808E-16FX SM ST-4GCcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 4808E-16FX SM-4GCcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 4808E-16FX ST-4GCcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 4808E-16FX-4Gcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
FixedFL SWITCH 4824E-4GCcisa_csaf_ot
FL SWITCH 4808E-16FX SM-4GC PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891080/firmware_update
MitigationFL SWITCH 3004T-FXcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 3004T-FX STcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 3006T-2FXcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 3006T-2FX SMcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 3006T-2FX STcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 3008cisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 3008Tcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 3012E-2FX SMcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 3012E-2SFXcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 3016cisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 3016Ecisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 3016Tcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 4000T-8POE-2SFP-Rcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 4008T-2GT-3FX SMcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 4008T-2GT-4FX SMcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 4008T-2SFPcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 4012T 2GT 2FXcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 4012T-2GT-2FX STcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 4800E-24FX SM-4GCcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 4800E-24FX-4GCcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 4808E-16FX LC-4GCcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 4808E-16FX SM LC-4GCcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 4808E-16FX SM ST-4GCcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 4808E-16FX SM-4GCcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 4808E-16FX ST-4GCcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 4808E-16FX-4Gcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update
MitigationFL SWITCH 4824E-4GCcisa_csaf_ot
FL SWITCH 3005: PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33 or higher
http://www.phoenixcontact.net/qr/2891030/firmware_update

cvss

Technical severity, 0–10. One row per scoring source.

10.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 9–10

v2.010highAV:N/AC:L/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 10 · impact 10

v3.09.8criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.09.8criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · CISA US

v3.09.8criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · Phoenix Contact PSIRT DE

v3.09criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-863USprimaryCWE-285USCWE-285USCWE-285USCWE-285US

affected products (173)

Products and version ranges known to be affected.

showing 20 of 173

advisories (2)

Vendor and ecosystem advisories describing this.

VDE-2017-006PHOENIX CONTACT: FL SWITCH 3xxx/4xxx/48xx series web-service authentication bypass2018-01-10csaf · phoenix_contact_psirtDE
PHOENIX CONTACT FL SWITCH 3xxx series, FL SWITCH 4xxx series, and FL SWITCH 48xx series products running firmware version 1.0 to 1.32 allow unauthenticated users with network access to gain administrative privileges (CVE-2017-16743) and expose information to unauthenticated users in Monitor Mode (CVE-2017-16741).
ICSA-18-011-03PHOENIX CONTACT FL SWITCH2018-01-11icsa · cisa_csaf_otUS
ATTENTION: Remotely exploitable/low skill level to exploit.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisa_csaf_ot phoenix_contact_psirt NVD CVE.org MITRE

published 2018-01-12modified 2026-06-17

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references (7)

External citations — patches, advisories, analysis.

scry

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