CVE-2025-44039: CP-XR-DE21-S -4G Router Firmware version 1.031.022 was discovered to contain insecure protections for its UART

Routine

MEDIUM 5.1MITIGATE

CVE-2025-44039 is a medium-severity flaw (CVSS 5.1) affecting cp-xr-de21-s firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CP-XR-DE21-S -4G Router Firmware version 1.031.022 was discovered to contain insecure protections for its UART console. This vulnerability allows local attackers to connect to the UART port via a serial connection, read all boot sequence, and revealing internal system details and sensitive information without any authentication.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.1 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-306
Published	2025-05-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cpplusworld

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-13 15:15 UTCPublished CVE record published
2026-06-17 09:24 UTCUpdated Record last modified

cpplusworld cp-xr-de21-s firmware MITIGATE

Affected: 1.031.022

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.031.022

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-2025-44039?

cp-xr-de21-s firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-44039 being exploited?

CVE-2025-44039 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-2025-44039 affect?

CVE-2025-44039 affects cp-xr-de21-s firmware. Severity is medium (CVSS 5.1). CP-XR-DE21-S -4G Router Firmware version 1.031.022 was discovered to contain insecure protections for its UART console. This vulnerability allows local attackers to connect to the UART port via a serial connection, read all boot sequence, a

How urgent is CVE-2025-44039?

Priority 26/100. Public exploit reference

References

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