CVE-2018-15137: CeLa Link CLR-M20 devices allow unauthorized users to upload any file (e.g., asp, aspx, cfm, html, jhtml, jsp,

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CRITICAL 9.8REMOTEMITIGATE

CVE-2018-15137 is a critical-severity flaw (CVSS 9.8) affecting clr-m20 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CeLa Link CLR-M20 devices allow unauthorized users to upload any file (e.g., asp, aspx, cfm, html, jhtml, jsp, or shtml), which causes remote code execution as well. Because of the WebDAV feature, it is possible to upload arbitrary files by utilizing the PUT method.

Why this priority

Critical severity
EPSS top 3%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	18.0% (top 3%)
CISA exploited list	No
Weakness	CWE-434
Published	2018-08-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cela link

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

Am I affected?

Timeline

2018-08-08 00:29 UTCPublished CVE record published
2026-06-17 01:42 UTCUpdated Record last modified

cela link clr-m20 firmware MITIGATE

Affected: 2.7.1.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.7.1.6

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Cela Link CLR-M20 2.7.1.6 - Arbitrary File Upload

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-2018-15137?

clr-m20 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-15137 being exploited?

CVE-2018-15137 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-2018-15137 affect?

CVE-2018-15137 affects clr-m20 firmware. Severity is critical (CVSS 9.8). CeLa Link CLR-M20 devices allow unauthorized users to upload any file (e.g., asp, aspx, cfm, html, jhtml, jsp, or shtml), which causes remote code execution as well. Because of the WebDAV feature, it is possible to upload arbitrary files by

How urgent is CVE-2018-15137?

Priority 69/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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