Medium 5.3Published Mar 18, 2026

CVE-2026-22321Stack-Based Buffer Overflow in CLI Login Username Handling over CLI

Updated under an hour ago (Oct 28, 2026, 1:10 PM ET)

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It affects Phoenix Contact FL SWITCH 2005 and 59 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Phoenix Contact FL SWITCH 2005

Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-121
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: CERTVDE
NVD analysis: Awaiting Analysis
Record last updated: Mar 18, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Phoenix Contact FL SWITCH 2005 phoenix_contact:fl_switch_2005 (from the name)	from 0.0.0 before 3.53	CNA record
Phoenix Contact FL SWITCH 2008 phoenix_contact:fl_switch_2008 (from the name)	from 0.0.0 before 3.53	CNA record
Phoenix Contact FL SWITCH 2016 phoenix_contact:fl_switch_2016 (from the name)	from 0.0.0 before 3.53	CNA record
Phoenix Contact FL SWITCH 2105 phoenix_contact:fl_switch_2105 (from the name)	from 0.0.0 before 3.53	CNA record
Phoenix Contact FL SWITCH 2108 phoenix_contact:fl_switch_2108 (from the name)	from 0.0.0 before 3.53	CNA record
Phoenix Contact FL SWITCH 2116 phoenix_contact:fl_switch_2116 (from the name)	from 0.0.0 before 3.53	CNA record
Phoenix Contact FL SWITCH 2204-2TC-2SFX phoenix_contact:fl_switch_2204_2tc_2sfx (from the name)	from 0.0.0 before 3.53	CNA record
Phoenix Contact FL SWITCH 2205 phoenix_contact:fl_switch_2205 (from the name)	from 0.0.0 before 3.53	CNA record
Phoenix Contact FL SWITCH 2206-2FX phoenix_contact:fl_switch_2206_2fx (from the name)	from 0.0.0 before 3.53	CNA record
Phoenix Contact FL SWITCH 2206-2FX SM phoenix_contact:fl_switch_2206_2fx_sm (from the name)	from 0.0.0 before 3.53	CNA record
1–10 of 60

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.