CVE-2018-5371: diag_ping.cmd on D-Link DSL-2640U devices with firmware IM_1.00 and ME_1.00, and DSL-2540U devices with firmwa

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HIGH 8.8MITIGATEMITIGATE

CVE-2018-5371 is a high-severity flaw (CVSS 8.8) affecting dsl-2540u firmware, dsl-2640u firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

diag_ping.cmd on D-Link DSL-2640U devices with firmware IM_1.00 and ME_1.00, and DSL-2540U devices with firmware ME_1.00, allows authenticated remote attackers to execute arbitrary OS commands via shell metacharacters in the ipaddr field of an HTTP GET request.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	42.0% (top 1%)
CISA exploited list	No
Weakness	CWE-78
Published	2018-01-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: d-link

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

Am I affected?

Timeline

2018-01-12 09:29 UTCPublished CVE record published
2026-06-17 02:00 UTCUpdated Record last modified

d-link dsl-2540u firmware MITIGATE

Affected: me_1.00

Fixed in: no fixed release known

Safe to downgrade to: a release before me_1.00

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.

d-link dsl-2640u firmware MITIGATE

Affected: im_1.00 · me_1.00

Fixed in: no fixed release known

Safe to downgrade to: a release before im_1.00

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-2018-5371?

dsl-2540u firmware: mitigate or apply the listed mitigation; dsl-2640u firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-5371 being exploited?

CVE-2018-5371 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-2018-5371 affect?

CVE-2018-5371 affects dsl-2540u firmware, dsl-2640u firmware. Severity is high (CVSS 8.8). diag_ping.cmd on D-Link DSL-2640U devices with firmware IM_1.00 and ME_1.00, and DSL-2540U devices with firmware ME_1.00, allows authenticated remote attackers to execute arbitrary OS commands via shell metacharacters in the ipaddr field of

How urgent is CVE-2018-5371?

Priority 60/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference

Software pages

D-Link vulnerabilities

References

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