Medium severity5.3NVD Advisory· Published Mar 18, 2026· Updated Jun 17, 2026

CVE-2026-22321

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Phoenixcontact/Fl Switch 2204 2tc 2sfx Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2206 2fx Sm Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2206 2fx Sm St Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2206 2fx St Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2206 2sfx Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2206 2sfx Pn Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2206c 2fx Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2207 Fx Sm Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2212 2tc 2sfx Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2214 2fx Sm Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2214 2sfx Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2214 2sfx Pn Firmwarecpe-rescue
Range: 0.0.0
Phoenix Contact/FL SWITCH 5924-4GCv5
Range: 0.0.0
Phoenix Contact/FL SWITCH 5916-8GC-4SFP+v5
Range: 0.0.0
Phoenix Contact/FL SWITCH 5924SFP-4GCv5
Range: 0.0.0
Phoenix Contact/FL SWITCH 5924-4SFP+v5
Range: 0.0.0
Phoenixcontact/Fl Switch 2306 2sfp Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/FL SWITCHcpe-rescue34 versions
0.0.0+ 33 more
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
Phoenix Contact/FL SWITCH 5916SFP-8GC-4SFP+v5
Range: 0.0.0
Phoenixcontact/FL NAT 2304-2GC-2SFPcpe-rescue2 versions
0.0.0+ 1 more
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
Phoenixcontact/FL NAT 2208cpe-rescue2 versions
0.0.0+ 1 more
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
Phoenixcontact/Fl Switch 2306 2sfp Pn Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2312 2gc 2sfp Firmwarecpe-rescue2 versions
0.0.0+ 1 more
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
Phoenixcontact/Fl Switch 2314 2sfp Firmwarecpe-rescue2 versions
0.0.0+ 1 more
- (no CPE)range: 0.0.0
- (no CPE)range: 0.0.0
Phoenixcontact/Fl Switch 2314 2sfp Pn Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2404 2tc 2sfx Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2406 2sfx Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2406 2sfx Pn Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2412 2tc 2sfx Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2414 2sfx Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2414 2sfx Pn Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2504 2gc 2sfp Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2506 2sfp Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2506 2sfp Pn Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2512 2gc 2sfp Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2514 2sfp Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2514 2sfp Pn Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2303 8sp1cpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2506 2sfp\/k1 Firmwarecpe-rescue
Range: 0.0.0
Phoenixcontact/Fl Switch 2316 Firmwarecpe-rescue
Range: 0.0.0

cvss	0.345
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000

CVE-2026-22321

Description

AI Insight

Affected products

Patches

Vulnerability mechanics

References

News mentions