CVE-2026-22320

Wednesday, March 18, 2026

6.5

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

A stack-based buffer overflow in the CLI's TFTP file‑transfer command handling allows a low-privileged attacker with Telnet/SSH access to trigger memory corruption by supplying unexpected or oversized filename input. Exploitation results in the corruption of the internal buffer, causing the CLI and web dashboard to become unavailable and leading to a denial of service.

Affected Software

Vendor	Product	Version Range	Status
Phoenix Contact	FL SWITCH 2005	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2008	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2016	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2105	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2108	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2116	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2204-2TC-2SFX	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2205	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2206-2FX	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2206-2FX SM	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2206-2FX SM ST	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2206-2FX ST	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2206-2SFX	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2206-2SFX PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2206C-2FX	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2207-FX	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2207-FX SM	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2208	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2208 PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2208C	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2212-2TC-2SFX	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2214-2FX	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2214-2FX SM	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2214-2SFX	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2214-2SFX PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2216	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2216 PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2304-2GC-2SFP	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2306-2SFP	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2306-2SFP PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2308	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2308 PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2312-2GC-2SFP	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2314-2SFP	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2314-2SFP PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2316	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2316 PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2404-2TC-2SFX	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2406-2SFX	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2406-2SFX PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2408	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2408 PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2412-2TC-2SFX	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2414-2SFX	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2414-2SFX PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2416	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2416 PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2504-2GC-2SFP	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2506-2SFP	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2506-2SFP PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2508	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2508 PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2512-2GC-2SFP	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2514-2SFP	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2514-2SFP PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2516	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2516 PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2608	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2608 PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2708	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2708 PN	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2303-8SP1	`0.0.0 < 3.53`	affected
Phoenix Contact	FL NAT 2008	`0.0.0 < 3.53`	affected
Phoenix Contact	FL NAT 2208	`0.0.0 < 3.53`	affected
Phoenix Contact	FL NAT 2304-2GC-2SFP	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2008F	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2316/K1	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2506-2SFP/K1	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 2508/K1	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH TSN 2316	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH TSN 2312-2GC-2SFP	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH TSN 2314-2SFP	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 5924-4GC	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 5916-8GC-4SFP+	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 5924SFP-4GC	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 5924-4SFP+	`0.0.0 < 3.53`	affected
Phoenix Contact	FL SWITCH 5916SFP-8GC-4SFP+	`0.0.0 < 3.53`	affected

Weaknesses

CWE-121: CWE-121 Stack-based Buffer Overflow

ADP Enrichment

CISA ADP Vulnrichment

SSVC:
Exploitation: none
- Automatable: no
- Technical Impact: partial

References

https://certvde.com/de/advisories/VDE-2025-104

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