How severe is CVE-2017-16743?

CVE-2017-16743 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-16743 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-16743?

CVE-2017-16743 primarily affects Phoenixcontact Fl Switch 3005 Firmware. In total, 29 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-16743?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2017-16743 published?

CVE-2017-16743 was published on 2018-01-12 and last updated on 2026-06-17.

CVE-2017-16743

CVE-2017-16743 is a critical-severity vulnerability in Phoenixcontact Fl Switch 3005 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Phoenixcontact Fl Switch 3005 Firmware
Published: 2018-01-12
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2017-16743?: 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.
How severe is CVE-2017-16743?: CVE-2017-16743 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-16743 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-16743?: CVE-2017-16743 primarily affects Phoenixcontact Fl Switch 3005 Firmware. In total, 29 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-16743?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2017-16743 published?: CVE-2017-16743 was published on 2018-01-12 and last updated on 2026-06-17.

References

Affected products (29)

cpe:2.3:o:phoenixcontact:fl_switch_3005_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_3005t_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_3004t-fx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_3004t-fx_st_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_3008_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_3008t_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_3006t-2fx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_3006t-2fx_st_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_3012e-2sfx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_3016e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_3016_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_3016t_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_3006t-2fx_sm_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_4008t-2sfp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_4008t-2gt-4fx_sm_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_4008t-2gt-3fx_sm_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_4808e-16fx_lc-4gc_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_4808e-16fx_sm-4gc_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_4808e-16fx_sm_st-4gc_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_4808e-16fx_st-4gc_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_4808e-16fx-4gc_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_4808e-16fx_sm_lc-4gc_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_4012t_2gt_2fx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_4012t-2gt-2fx_st_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_4824e-4gc_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_4800e-24fx-4gc_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_4800e-24fx_sm-4gc_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_3012e-2fx_sm_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:fl_switch_4000t-8poe-2sfp-r_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Phoenixcontact Fl Switch 3005 Firmware

CVE-2018-10730 — Critical (CVSS 9.1): All Phoenix Contact managed FL SWITCH 3xxx, 4xxx, 48xx products running firmware version 1.0 to 1.33 are prone to OS…
CVE-2018-10731 — Critical (CVSS 9.0): All Phoenix Contact managed FL SWITCH 3xxx, 4xxx, 48xx products running firmware version 1.0 to 1.33 are prone to…
CVE-2018-13993 — High (CVSS 8.8): The WebUI of PHOENIX CONTACT FL SWITCH 3xxx, 4xxx, 48xx versions 1.0 to 1.34 is prone to CSRF.
CVE-2018-13990 — High (CVSS 8.6): The WebUI of PHOENIX CONTACT FL SWITCH 3xxx, 4xxx, 48xx versions prior to 1.35 is vulnerable to brute-force attacks,…
CVE-2018-13992 — High (CVSS 8.2): The WebUI of PHOENIX CONTACT FL SWITCH 3xxx, 4xxx, 48xx versions 1.0 to 1.34 allows for plaintext transmission (HTTP)…
CVE-2018-10728 — High (CVSS 8.1): All Phoenix Contact managed FL SWITCH 3xxx, 4xxx, 48xx products running firmware version 1.0 to 1.33 are prone to…

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