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Unrated severityNVD Advisory· Published Mar 18, 2026· Updated Mar 18, 2026

Stack-Based Buffer Overflow in CLI Login Username Handling over CLI

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

77
  • 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 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 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 2204-2TC-2SFXv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2206-2FX SMv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2206-2FX SM STv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2206-2FX STv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2206-2SFXv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2206-2SFX PNv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2206C-2FXv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2207-FX SMv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2212-2TC-2SFXv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2214-2FX SMv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2214-2SFXv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2214-2SFX PNv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2303-8SP1v5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2306-2SFPv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2306-2SFP PNv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2312-2GC-2SFPv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2314-2SFPv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2314-2SFP PNv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2404-2TC-2SFXv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2406-2SFXv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2406-2SFX PNv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2412-2TC-2SFXv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2414-2SFXv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2414-2SFX PNv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2504-2GC-2SFPv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2506-2SFPv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2506-2SFP/K1v5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2506-2SFP PNv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2512-2GC-2SFPv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2514-2SFPv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 2514-2SFP PNv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 5916-8GC-4SFP+v5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 5916SFP-8GC-4SFP+v5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 5924-4GCv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 5924-4SFP+v5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH 5924SFP-4GCv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH TSN 2312-2GC-2SFPv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH TSN 2314-2SFPv5
    Range: 0.0.0
  • Phoenix Contact/FL SWITCH TSN 2316v5
    Range: 0.0.0

Patches

Vulnerability mechanics

References

1

News mentions

0

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