CVE-2018-20057: An issue was discovered in /bin/boa on D-Link DIR-619L Rev.B 2.06B1 and DIR-605L Rev.B 2.12B1 devices

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HIGH 8.8MITIGATEMITIGATE

CVE-2018-20057 is a high-severity flaw (CVSS 8.8) affecting dir-619l firmware, dir-605l firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in /bin/boa on D-Link DIR-619L Rev.B 2.06B1 and DIR-605L Rev.B 2.12B1 devices. goform/formSysCmd allows remote authenticated users to execute arbitrary OS commands via the sysCmd POST parameter.

Why this priority

High severity
EPSS top 6%: 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	7.4% (top 6%)
CISA exploited list	No
Weakness	CWE-78
Published	2018-12-11
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

2018-12-11 09:29 UTCPublished CVE record published
2026-06-17 01:52 UTCUpdated Record last modified

d-link dir-619l firmware MITIGATE

Affected: 2.06b1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.06b1

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 dir-605l firmware MITIGATE

Affected: 2.12b1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.12b1

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-2018-20057?

dir-619l firmware: mitigate or apply the listed mitigation; dir-605l firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-20057 being exploited?

CVE-2018-20057 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-2018-20057 affect?

CVE-2018-20057 affects dir-619l firmware, dir-605l firmware. Severity is high (CVSS 8.8). An issue was discovered in /bin/boa on D-Link DIR-619L Rev.B 2.06B1 and DIR-605L Rev.B 2.12B1 devices. goform/formSysCmd allows remote authenticated users to execute arbitrary OS commands via the sysCmd POST parameter.

How urgent is CVE-2018-20057?

Priority 59/100. High severity; EPSS top 6%: very likely to be exploited; Public exploit reference

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2026-2056 MEDIUM 5.3 MITIGATE MITIGATE A security vulnerability has been detected in D-Link DIR-605L and DIR-619L 2.06B01/2.13B01
CVE-2026-2055 MEDIUM 5.3 MITIGATE MITIGATE A weakness has been identified in D-Link DIR-605L and DIR-619L 2.06B01/2.13B01
CVE-2026-2054 MEDIUM 5.3 MITIGATE MITIGATE A security flaw has been discovered in D-Link DIR-605L and DIR-619L 2.06B01/2.13B01
CVE-2025-8978 MEDIUM 6.6 MITIGATE A vulnerability was determined in D-Link DIR-619L 6.02CN02
CVE-2025-6617 HIGH 8.8 MITIGATE A vulnerability was found in D-Link DIR-619L 2.06B01 and classified as critical

References

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