CVE-2018-11240: An issue was discovered on SoftCase T-Router build 20112017 devices

This week

CRITICAL 9.8REMOTEMITIGATE

CVE-2018-11240 is a critical-severity flaw (CVSS 9.8) affecting t-router firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered on SoftCase T-Router build 20112017 devices. There are no restrictions on the 'exec command' feature of the T-Router protocol. If the command syntax is correct, there is code execution both on the other modem and on the main servers. This is fixed in production builds as of Spring 2018.

Why this priority

Critical severity
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	2.3% (top 17%)
CISA exploited list	No
Weakness	CWE-732
Published	2018-09-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: softcase

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

Am I affected?

Timeline

2018-09-21 15:29 UTCPublished CVE record published
2026-06-17 01:35 UTCUpdated Record last modified

softcase t-router firmware MITIGATE

Affected: 20112017

Fixed in: no fixed release known

Safe to downgrade to: a release before 20112017

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-2018-11240?

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

Is CVE-2018-11240 being exploited?

CVE-2018-11240 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-2018-11240 affect?

CVE-2018-11240 affects t-router firmware. Severity is critical (CVSS 9.8). An issue was discovered on SoftCase T-Router build 20112017 devices. There are no restrictions on the 'exec command' feature of the T-Router protocol. If the command syntax is correct, there is code execution both on the other modem and on

How urgent is CVE-2018-11240?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2018-11241 CRITICAL 9.8 MITIGATE An issue was discovered on SoftCase T-Router build 20112017 devices

References

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