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CVE-2026-22320· NVD / CVE Program· CNA CERTVDE

Stack-Based Buffer Overflow in TFTP File-Transfer Command Handling over CLI

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.32% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Phoenix Contact FL NAT 2008 3.53; Phoenix Contact FL NAT 2208 3.53; Phoenix Contact FL NAT 2304-2GC-2SFP 3.53.

Low priority for now. Upgrade to Phoenix Contact FL NAT 2008 3.53; Phoenix Contact FL NAT 2208 3.53; Phoenix Contact FL NAT 2304-2GC-2SFP 3.53 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Mar 18, 2026
Updated
Jun 17, 2026
EPSS
0.3% · 24th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · CERTVDE
6.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-22320

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (CERTVDE). Independent of NVD's CPE analysis and usually ahead of it.

  • Phoenix Contact FL NAT 2008

    • 0.0.0 and later · before 3.53affected · semver

  • Phoenix Contact FL NAT 2208

    • 0.0.0 and later · before 3.53affected · semver

  • Phoenix Contact FL NAT 2304-2GC-2SFP

    • 0.0.0 and later · before 3.53affected · semver

  • Phoenix Contact FL SWITCH 2005

    • 0.0.0 and later · before 3.53affected · semver

  • Phoenix Contact FL SWITCH 2008

    • 0.0.0 and later · before 3.53affected · semver

  • Phoenix Contact FL SWITCH 2008F

    • 0.0.0 and later · before 3.53affected · semver

  • Phoenix Contact FL SWITCH 2016

    • 0.0.0 and later · before 3.53affected · semver

  • Phoenix Contact FL SWITCH 2105

    • 0.0.0 and later · before 3.53affected · semver

  • Phoenix Contact FL SWITCH 2108

    • 0.0.0 and later · before 3.53affected · semver

  • Phoenix Contact FL SWITCH 2116

    • 0.0.0 and later · before 3.53affected · semver

  • Phoenix Contact FL SWITCH 2204-2TC-2SFX

    • 0.0.0 and later · before 3.53affected · semver

  • Phoenix Contact FL SWITCH 2205

    • 0.0.0 and later · before 3.53affected · semver

Same product

phoenix contact: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-22323Cross‑Site Request Forgery in Link Aggregation Configuration
    28Monitor
  • CVE-2026-22322Stored Cross‑Site Scripting in Link Aggregation Name Handling
    28Monitor
  • CVE-2026-22317Command Injection Vulnerability in Root CA Certificate Transfer Workflow
    28Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-22318Mar 18, 2026 · Stack-Based Buffer Overflow in File Transfer Parameter Handling
    19Monitor
  • ← EarlierCVE-2026-22319Mar 18, 2026 · Stack-Based Buffer Overflow in File Install Parameter Handling
    19Monitor
  • Later →CVE-2026-22321Mar 18, 2026 · Stack-Based Buffer Overflow in CLI Login Username Handling over CLI
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Phoenix Contact FL NAT 20083.53Vendor (CNA)
Phoenix Contact FL NAT 22083.53Vendor (CNA)
Phoenix Contact FL NAT 2304-2GC-2SFP3.53Vendor (CNA)
Phoenix Contact FL SWITCH 20053.53Vendor (CNA)
Phoenix Contact FL SWITCH 20083.53Vendor (CNA)
Phoenix Contact FL SWITCH 2008F3.53Vendor (CNA)
Phoenix Contact FL SWITCH 20163.53Vendor (CNA)
Phoenix Contact FL SWITCH 21053.53Vendor (CNA)
Phoenix Contact FL SWITCH 21083.53Vendor (CNA)
Phoenix Contact FL SWITCH 21163.53Vendor (CNA)
Phoenix Contact FL SWITCH 2204-2TC-2SFX3.53Vendor (CNA)
Phoenix Contact FL SWITCH 22053.53Vendor (CNA)
Phoenix Contact FL SWITCH 2206-2FX3.53Vendor (CNA)
Phoenix Contact FL SWITCH 2206-2FX SM3.53Vendor (CNA)
Phoenix Contact FL SWITCH 2206-2FX SM ST3.53Vendor (CNA)
Phoenix Contact FL SWITCH 2206-2FX ST3.53Vendor (CNA)
Phoenix Contact FL SWITCH 2206-2SFX3.53Vendor (CNA)
Phoenix Contact FL SWITCH 2206-2SFX PN3.53Vendor (CNA)
Phoenix Contact FL SWITCH 2206C-2FX3.53Vendor (CNA)
Phoenix Contact FL SWITCH 2207-FX3.53Vendor (CNA)
Phoenix Contact FL SWITCH 2207-FX SM3.53Vendor (CNA)
Phoenix Contact FL SWITCH 22083.53Vendor (CNA)
Phoenix Contact FL SWITCH 2208 PN3.53Vendor (CNA)
Phoenix Contact FL SWITCH 2208C3.53Vendor (CNA)
Phoenix Contact FL SWITCH 2212-2TC-2SFX3.53Vendor (CNA)
Phoenix Contact FL SWITCH 2214-2FX3.53Vendor (CNA)
Phoenix Contact FL SWITCH 2214-2FX SM3.53Vendor (CNA)
Phoenix Contact FL SWITCH 2214-2SFX3.53Vendor (CNA)
Phoenix Contact FL SWITCH 2214-2SFX PN3.53Vendor (CNA)
Phoenix Contact FL SWITCH 22163.53Vendor (CNA)

+47

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-223160 days apartBuffer Overflow using TFTP Filename
    26Monitor
  • CVE-2026-223210 days apartStack-Based Buffer Overflow in CLI Login Username Handling over CLI
    21Monitor
  • CVE-2026-223180 days apartStack-Based Buffer Overflow in File Transfer Parameter Handling
    19Monitor
  • CVE-2026-223190 days apartStack-Based Buffer Overflow in File Install Parameter Handling
    19Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-121 · Stack-based Buffer Overflow

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records