CVE-2025-65855: The OTA firmware update mechanism in Netun Solutions HelpFlash IoT (firmware v18_178_221102_ASCII_PRO_1R5_50)

Routine

MEDIUM 6.6MITIGATE

CVE-2025-65855 is a medium-severity flaw (CVSS 6.6) affecting helpflash iot firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The OTA firmware update mechanism in Netun Solutions HelpFlash IoT (firmware v18_178_221102_ASCII_PRO_1R5_50) uses hard-coded WiFi credentials identical across all devices and does not authenticate update servers or validate firmware signatures. An attacker with brief physical access can activate OTA mode (8-second button press), create a malicious WiFi AP using the known credentials, and serve malicious firmware via unauthenticated HTTP to achie

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.6 (Medium)
Attack vector	Physical
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-319, CWE-494, CWE-798
Published	2025-12-17
Last modified	2026-10-13

Publisher (CNA): MITRE · Vendor: netun

Last updated 2026-10-13 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-17 17:15 UTCPublished CVE record published
2026-10-13 11:10 UTCUpdated Record last modified

netun helpflash iot firmware MITIGATE

Affected: 18_178_221102_ascii_pro_1r5_50

Fixed in: no fixed release known

Safe to downgrade to: a release before 18_178_221102_ascii_pro_1r5_50

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-65855?

helpflash iot firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-65855 being exploited?

CVE-2025-65855 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-65855 affect?

CVE-2025-65855 affects helpflash iot firmware. Severity is medium (CVSS 6.6). The OTA firmware update mechanism in Netun Solutions HelpFlash IoT (firmware v18_178_221102_ASCII_PRO_1R5_50) uses hard-coded WiFi credentials identical across all devices and does not authenticate update servers or validate firmware signat

How urgent is CVE-2025-65855?

Priority 23/100. No elevated risk signals yet.

Software pages

Wi-Fi vulnerabilities

References

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