Phoenix Contact FL SWITCH 2005 up to 3.52 Telnet/SSH stack-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability has been found in Phoenix Contact FL SWITCH 2005, FL SWITCH 2008, FL SWITCH 2016, FL SWITCH 2105, FL SWITCH 2108, FL SWITCH 2116, FL SWITCH 2204-2TC-2SFX, FL SWITCH 2205, FL SWITCH 2206-2FX, FL SWITCH 2206-2FX SM, FL SWITCH 2206-2FX SM ST, FL SWITCH 2206-2FX ST, FL SWITCH 2206-2SFX, FL SWITCH 2206-2SFX PN, FL SWITCH 2206C-2FX, FL SWITCH 2207-FX, FL SWITCH 2207-FX SM, FL SWITCH 2208, FL SWITCH 2208 PN, FL SWITCH 2208C, FL SWITCH 2212-2TC-2SFX, FL SWITCH 2214-2FX, FL SWITCH 2214-2FX SM, FL SWITCH 2214-2SFX, FL SWITCH 2214-2SFX PN, FL SWITCH 2216, FL SWITCH 2216 PN, FL SWITCH 2304-2GC-2SFP, FL SWITCH 2306-2SFP, FL SWITCH 2306-2SFP PN, FL SWITCH 2308, FL SWITCH 2308 PN, FL SWITCH 2312-2GC-2SFP, FL SWITCH 2314-2SFP, FL SWITCH 2314-2SFP PN, FL SWITCH 2316, FL SWITCH 2316 PN, FL SWITCH 2404-2TC-2SFX, FL SWITCH 2406-2SFX, FL SWITCH 2406-2SFX PN, FL SWITCH 2408, FL SWITCH 2408 PN, FL SWITCH 2412-2TC-2SFX, FL SWITCH 2414-2SFX, FL SWITCH 2414-2SFX PN, FL SWITCH 2416, FL SWITCH 2416 PN, FL SWITCH 2504-2GC-2SFP, FL SWITCH 2506-2SFP, FL SWITCH 2506-2SFP PN, FL SWITCH 2508, FL SWITCH 2508 PN, FL SWITCH 2512-2GC-2SFP, FL SWITCH 2514-2SFP, FL SWITCH 2514-2SFP PN, FL SWITCH 2516, FL SWITCH 2516 PN, FL SWITCH 2608, FL SWITCH 2608 PN, FL SWITCH 2708, FL SWITCH 2708 PN, FL SWITCH 2303-8SP1, FL NAT 2008, FL NAT 2208, FL NAT 2304-2GC-2SFP, FL SWITCH 2008F, K1, FL SWITCH TSN 2316, FL SWITCH TSN 2312-2GC-2SFP, FL SWITCH TSN 2314-2SFP, FL SWITCH 5924-4GC, FL SWITCH 5916-8GC-4SFP+, FL SWITCH 5924SFP-4GC, FL SWITCH 5924-4SFP+ and FL SWITCH 5916SFP-8GC-4SFP+ up to 3.52 and classified as critical. The impacted element is an unknown function of the component Telnet/SSH. Performing a manipulation results in stack-based overflow. This vulnerability is identified as CVE-2026-22321. The attack can be initiated remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Phoenix Contact FL SWITCH 2005, FL SWITCH 2008, FL SWITCH 2016, FL SWITCH 2105, FL SWITCH 2108, FL SWITCH 2116, FL SWITCH 2204-2TC-2SFX, FL SWITCH 2205, FL SWITCH 2206-2FX, FL SWITCH 2206-2FX SM, FL SWITCH 2206-2FX SM ST, FL SWITCH 2206-2FX ST, FL SWITCH 2206-2SFX, FL SWITCH 2206-2SFX PN, FL SWITCH 2206C-2FX, FL SWITCH 2207-FX, FL SWITCH 2207-FX SM, FL SWITCH 2208, FL SWITCH 2208 PN, FL SWITCH 2208C, FL SWITCH 2212-2TC-2SFX, FL SWITCH 2214-2FX, FL SWITCH 2214-2FX SM, FL SWITCH 2214-2SFX, FL SWITCH 2214-2SFX PN, FL SWITCH 2216, FL SWITCH 2216 PN, FL SWITCH 2304-2GC-2SFP, FL SWITCH 2306-2SFP, FL SWITCH 2306-2SFP PN, FL SWITCH 2308, FL SWITCH 2308 PN, FL SWITCH 2312-2GC-2SFP, FL SWITCH 2314-2SFP, FL SWITCH 2314-2SFP PN, FL SWITCH 2316, FL SWITCH 2316 PN, FL SWITCH 2404-2TC-2SFX, FL SWITCH 2406-2SFX, FL SWITCH 2406-2SFX PN, FL SWITCH 2408, FL SWITCH 2408 PN, FL SWITCH 2412-2TC-2SFX, FL SWITCH 2414-2SFX, FL SWITCH 2414-2SFX PN, FL SWITCH 2416, FL SWITCH 2416 PN, FL SWITCH 2504-2GC-2SFP, FL SWITCH 2506-2SFP, FL SWITCH 2506-2SFP PN, FL SWITCH 2508, FL SWITCH 2508 PN, FL SWITCH 2512-2GC-2SFP, FL SWITCH 2514-2SFP, FL SWITCH 2514-2SFP PN, FL SWITCH 2516, FL SWITCH 2516 PN, FL SWITCH 2608, FL SWITCH 2608 PN, FL SWITCH 2708, FL SWITCH 2708 PN, FL SWITCH 2303-8SP1, FL NAT 2008, FL NAT 2208, FL NAT 2304-2GC-2SFP, FL SWITCH 2008F, K1, FL SWITCH TSN 2316, FL SWITCH TSN 2312-2GC-2SFP, FL SWITCH TSN 2314-2SFP, FL SWITCH 5924-4GC, FL SWITCH 5916-8GC-4SFP+, FL SWITCH 5924SFP-4GC, FL SWITCH 5924-4SFP+ and FL SWITCH 5916SFP-8GC-4SFP+ up to 3.52. It has been classified as critical. This affects an unknown part of the component Telnet/SSH. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on availability. The summary by CVE is:

A stack-based buffer overflow in the device's Telnet/SSH CLI login routine occurs when a unauthenticated attacker send an oversized or unexpected username input. An overflow condition crashes the thread handling the login attempt, forcing the session to close. Because other CLI sessions remain unaffected, the impact is limited to a low‑severity availability disruption.

The weakness was released by Gabriele Quagliarella as VDE-2025-104. The advisory is shared at certvde.com. This vulnerability is uniquely identified as CVE-2026-22321 since 01/07/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/22/2026).

Upgrading to version 3.53 eliminates this vulnerability.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-12790) and CERT Bund (WID-SEC-2026-0765). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Phoenix Contact FL SWITCH

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (CERTVDE): 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: FL SWITCH 2005/FL SWITCH 2008/FL SWITCH 2016/FL SWITCH 2105/FL SWITCH 2108/FL SWITCH 2116/FL SWITCH 2204-2TC-2SFX/FL SWITCH 2205/FL SWITCH 2206-2FX/FL SWITCH 2206-2FX SM/FL SWITCH 2206-2FX SM ST/FL SWITCH 2206-2FX ST/FL SWITCH 2206-2SFX/FL SWITCH 2206-2SFX PN/FL SWITCH 2206C-2FX/FL SWITCH 2207-FX/FL SWITCH 2207-FX SM/FL SWITCH 2208/FL SWITCH 2208 PN/FL SWITCH 2208C/FL SWITCH 2212-2TC-2SFX/FL SWITCH 2214-2FX/FL SWITCH 2214-2FX SM/FL SWITCH 2214-2SFX/FL SWITCH 2214-2SFX PN/FL SWITCH 2216/FL SWITCH 2216 PN/FL SWITCH 2304-2GC-2SFP/FL SWITCH 2306-2SFP/FL SWITCH 2306-2SFP PN/FL SWITCH 2308/FL SWITCH 2308 PN/FL SWITCH 2312-2GC-2SFP/FL SWITCH 2314-2SFP/FL SWITCH 2314-2SFP PN/FL SWITCH 2316/FL SWITCH 2316 PN/FL SWITCH 2404-2TC-2SFX/FL SWITCH 2406-2SFX/FL SWITCH 2406-2SFX PN/FL SWITCH 2408/FL SWITCH 2408 PN/FL SWITCH 2412-2TC-2SFX/FL SWITCH 2414-2SFX/FL SWITCH 2414-2SFX PN/FL SWITCH 2416/FL SWITCH 2416 PN/FL SWITCH 2504-2GC-2SFP/FL SWITCH 2506-2SFP/FL SWITCH 2506-2SFP PN/FL SWITCH 2508/FL SWITCH 2508 PN/FL SWITCH 2512-2GC-2SFP/FL SWITCH 2514-2SFP/FL SWITCH 2514-2SFP PN/FL SWITCH 2516/FL SWITCH 2516 PN/FL SWITCH 2608/FL SWITCH 2608 PN/FL SWITCH 2708/FL SWITCH 2708 PN/FL SWITCH 2303-8SP1/FL NAT 2008/FL NAT 2208/FL NAT 2304-2GC-2SFP/FL SWITCH 2008F/K1/FL SWITCH TSN 2316/FL SWITCH TSN 2312-2GC-2SFP/FL SWITCH TSN 2314-2SFP/FL SWITCH 5924-4GC/FL SWITCH 5916-8GC-4SFP+/FL SWITCH 5924SFP-4GC/FL SWITCH 5924-4SFP+/FL SWITCH 5916SFP-8GC-4SFP+ 3.53

Timelineinfo

01/07/2026 CVE reserved
03/18/2026 +70 days Advisory disclosed
03/18/2026 +0 days VulDB entry created
03/22/2026 +4 days VulDB entry last update

Sourcesinfo

Advisory: VDE-2025-104
Researcher: Gabriele Quagliarella
Status: Confirmed

CVE: CVE-2026-22321 (🔒)
GCVE (CVE): GCVE-0-2026-22321
GCVE (VulDB): GCVE-100-351501
EUVD: 🔒
CERT Bund: WID-SEC-2026-0765 - Phoenix Contact FL SWITCH: Mehrere Schwachstellen

Entryinfo

Created: 03/18/2026 09:16
Updated: 03/22/2026 05:48
Changes: 03/18/2026 09:16 (66), 03/18/2026 10:46 (1), 03/18/2026 12:36 (7), 03/22/2026 05:48 (1)
Complete: 🔍
Cache ID: 216::103

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Discussion

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