CVE-2021-3707: D-Link router DSL-2750U with firmware vME1.16 or prior versions is vulnerable to unauthorized configuration mo

Q: How do I fix CVE-2021-3707?

dsl-2750u firmware: upgrade to newer than 1.16. Exact commands for each OS are on this page.

Q: Is CVE-2021-3707 being exploited?

CVE-2021-3707 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-3707 affect?

CVE-2021-3707 affects dsl-2750u firmware. Severity is medium (CVSS 5.5). D-Link router DSL-2750U with firmware vME1.16 or prior versions is vulnerable to unauthorized configuration modification. An unauthenticated attacker on the local network may exploit this, with CVE-2021-3708, to execute any OS commands on t

Q: How urgent is CVE-2021-3707?

Priority 38/100. No elevated risk signals yet.

Routine

MEDIUM 5.5UPGRADE

CVE-2021-3707 is a medium-severity flaw (CVSS 5.5) affecting dsl-2750u firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

D-Link router DSL-2750U with firmware vME1.16 or prior versions is vulnerable to unauthorized configuration modification. An unauthenticated attacker on the local network may exploit this, with CVE-2021-3708, to execute any OS commands on the vulnerable device.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.5% (top 25%)
CISA exploited list	No
Weakness	CWE-15
Published	2021-08-16
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: dlink

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

Am I affected?

Timeline

2021-08-16 05:15 UTCPublished CVE record published
2026-06-17 04:05 UTCUpdated Record last modified

dlink dsl-2750u firmware UPGRADE

Affected: <= 1.16

Fixed in: newer than 1.16

Safe to downgrade to: no unaffected older release

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-2021-3707?

dsl-2750u firmware: upgrade to newer than 1.16. Exact commands for each OS are on this page.

Is CVE-2021-3707 being exploited?

CVE-2021-3707 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-2021-3707 affect?

CVE-2021-3707 affects dsl-2750u firmware. Severity is medium (CVSS 5.5). D-Link router DSL-2750U with firmware vME1.16 or prior versions is vulnerable to unauthorized configuration modification. An unauthenticated attacker on the local network may exploit this, with CVE-2021-3708, to execute any OS commands on t

How urgent is CVE-2021-3707?

Priority 38/100. No elevated risk signals yet.

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2024-9792 LOW 2.4 MITIGATE A vulnerability classified as problematic has been found in D-Link DSL-2750U R5B017
CVE-2023-46033 MEDIUM 6.8 MITIGATE MITIGATE D-Link (Non-US) DSL-2750U N300 ADSL2+ and (Non-US) DSL-2730U N150 ADSL2+ are vulnerable to Incorrect Access Co
CVE-2021-3708 HIGH 7.8 UPGRADE D-Link router DSL-2750U with firmware vME1.16 or prior versions is vulnerable to OS command injection
CVE-2020-13150 HIGH 7.8 MITIGATE D-link DSL-2750U ISL2750UEME3.V1E devices allow approximately 90 seconds of access to the control panel, after
CVE-2019-1010155 CRITICAL 9.1 MITIGATE D-Link DSL-2750U 1.11 is affected by: Authentication Bypass

References

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