CVE Tools
Sign in

CVE-2026-22321

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

Published: Mar 18, 2026Updated: Mar 18, 2026 Sources: CVE List NVDCWE-121
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.4%
Top 71.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-121

Affected Products

FL SWITCH 2005Phoenix ContactICS / OT / IoT
FL SWITCH 2008Phoenix ContactICS / OT / IoT
FL SWITCH 2016Phoenix ContactICS / OT / IoT
FL SWITCH 2105Phoenix ContactICS / OT / IoT
FL SWITCH 2108Phoenix ContactICS / OT / IoT
phoenix contactcommercialDEICS / OT / IoTaka phoenixcontact
and 72 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

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

Timeline

Published
Mar 18, 2026
Last Updated
Mar 18, 2026

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-22321 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows