Primary

Context

Phoenix Contact FL SWITCH Products Denial-of-Service Vulnerability via Stack-Based Buffer Overflow

Vulnerability

Patched

A stack-based buffer overflow vulnerability has been identified in Phoenix Contact FL SWITCH 2xxx, FL SWITCH TSN 23xx, and FL SWITCH 59xx firmware versions prior to 3.53. This vulnerability allows remote attackers with user privileges in the web UI to overwrite the TFTP filename setting using a POST request, leading to a denial-of-service condition.

Impact

Exploitation of this vulnerability causes a denial-of-service condition, disrupting the normal functionality of the affected device.

Remediation

Users are advised to update to the latest firmware version 3.53, which addresses this vulnerability.

Added: Mar 18, 2026, 8:35 AM

Updated: Mar 18, 2026, 8:35 AM

Affected Products

Phoenix Contact FL SWITCH 2005

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2005:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2008

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2008:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2008F

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2008f:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2016

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2016:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2105

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2105:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2108

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2108:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2116

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2116:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2204-2TC-2SFX

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2204-2tc-2sfx:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2205

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2205:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2206-2FX

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2206-2fx:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2206-2FX SM

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2206-2fx_sm:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2206-2FX SM ST

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2206-2fx_sm_st:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2206-2FX ST

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2206-2fx_st:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2206-2SFX

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2206-2sfx:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2206-2SFX PN

0 remedies

cpe:2.3:h:phoenixcontact:fl_switch_2206-2sfx_pn:*:*:*:*:*:*:*, +1 more

0 remedies

Phoenix Contact FL SWITCH 2207-FX

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2406-2sfx:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2207-FX SM

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2207-fx:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2208

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2208:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2208 PN

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2208_pn:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2208C

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2208c:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2212-2TC-2SFX

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2212-2tc-2sfx:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2214-2FX

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2214-2fx:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2214-2SFX

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2214-2sfx:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2216

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2216:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2303-8SP1

0 remedies

Phoenix Contact FL SWITCH 2304-2GC-2SFP

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2304-2gc-2sfp:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2306-2SFP

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2306-2sfp:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2312-2GC-2SFP

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2312-2gc-2sfp:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH 2314-2SFP

Moderate fix1 remedy

cpe:2.3:h:phoenixcontact:fl_switch_2314-2sfp:*:*:*:*:*:*:*, +1 more

Moderate fix1 remedy

< 3.53
= 3.50

Phoenix Contact FL SWITCH TSN 2312-2GC-2SFP

0 remedies

Phoenix Contact FL SWITCH TSN 2314-2SFP

0 remedies

Phoenix Contact FL SWITCH TSN 2316

0 remedies

Vulnerability Rating

Custom Algorithm

spread

4.5

impact

0.6

exploitability

4.9

remediation

7.7

relevance

4.1

threat

0.0

urgency

2.9

incentive

0.0

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.

Vulnerability Rating

Custom Algorithm

spread

4.5

impact

0.6

exploitability

4.9

remediation

7.7

relevance

4.1

threat

0.0

urgency

2.9

incentive

0.0

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.