CVE-2016-5681: Stack-based buffer overflow in dws/api/Login on D-Link DIR-850L B1 2.07 before 2.07WWB05, DIR-817 Ax, DIR-818L

Q: How do I fix CVE-2016-5681?

dir-868l firmware: upgrade to newer than 3.00; dir-822 firmware: mitigate or apply the listed mitigation; dir-880l firmware: upgrade to newer than 1.07. Exact commands for each OS are on this page.

Q: Is CVE-2016-5681 being exploited?

CVE-2016-5681 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-2016-5681 affect?

CVE-2016-5681 affects dir-868l firmware, dir-822 firmware, dir-880l firmware. Severity is critical (CVSS 9.8). Stack-based buffer overflow in dws/api/Login on D-Link DIR-850L B1 2.07 before 2.07WWB05, DIR-817 Ax, DIR-818LW Bx before 2.05b03beta03, DIR-822 C1 3.01 before 3.01WWb02, DIR-823 A1 1.00 before 1.00WWb05, DIR-895L A1 1.11 before 1.11WWb04,

Q: How urgent is CVE-2016-5681?

Priority 63/100. Critical severity; EPSS top 4%: very likely to be exploited; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADEMITIGATEUPGRADE

CVE-2016-5681 is a critical-severity flaw (CVSS 9.8) affecting dir-868l firmware, dir-822 firmware, dir-880l firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based buffer overflow in dws/api/Login on D-Link DIR-850L B1 2.07 before 2.07WWB05, DIR-817 Ax, DIR-818LW Bx before 2.05b03beta03, DIR-822 C1 3.01 before 3.01WWb02, DIR-823 A1 1.00 before 1.00WWb05, DIR-895L A1 1.11 before 1.11WWb04, DIR-890L A1 1.09 before 1.09b14, DIR-885L A1 1.11 before 1.11WWb07, DIR-880L A1 1.07 before 1.07WWb08, DIR-868L B1 2.03 before 2.03WWb01, and DIR-868L C1 3.00 before 3.00WWb01 devices allows remote attackers to

Why this priority

Critical severity
EPSS top 4%: very likely to be exploited
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	11.9% (top 4%)
CISA exploited list	No
Weakness	CWE-119
Published	2016-08-25
Last modified	2026-06-17

Publisher (CNA): CERT/CC · Vendor: d-link · dlink

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

Am I affected?

Timeline

2016-08-25 21:59 UTCPublished CVE record published
2026-06-17 00:49 UTCUpdated Record last modified

dlink dir-868l firmware UPGRADE

Affected: <= 2.03 · <= 3.00

Fixed in: newer than 3.00

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.

dlink dir-822 firmware MITIGATE

Affected: 3.01

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.01

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-880l firmware UPGRADE

Affected: <= 1.07

Fixed in: newer than 1.07

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.

d-link dir-850l firmare UPGRADE

Affected: <= 2.07

Fixed in: newer than 2.07

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.

d-link dir-895l firmware UPGRADE

Affected: <= 1.11

Fixed in: newer than 1.11

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.

d-link dir-817l\(w\) firmware UPGRADE

Affected: <= jul.2016

Fixed in: newer than jul.2016

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-2016-5681?

dir-868l firmware: upgrade to newer than 3.00; dir-822 firmware: mitigate or apply the listed mitigation; dir-880l firmware: upgrade to newer than 1.07. Exact commands for each OS are on this page.

Is CVE-2016-5681 being exploited?

CVE-2016-5681 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-2016-5681 affect?

CVE-2016-5681 affects dir-868l firmware, dir-822 firmware, dir-880l firmware. Severity is critical (CVSS 9.8). Stack-based buffer overflow in dws/api/Login on D-Link DIR-850L B1 2.07 before 2.07WWB05, DIR-817 Ax, DIR-818LW Bx before 2.05b03beta03, DIR-822 C1 3.01 before 3.01WWb02, DIR-823 A1 1.00 before 1.00WWb05, DIR-895L A1 1.11 before 1.11WWb04,

How urgent is CVE-2016-5681?

Priority 63/100. Critical severity; EPSS top 4%: very likely to be exploited; Remotely exploitable, no login, no user action

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2026-3485 CRITICAL 9.8 MITIGATE A flaw has been found in D-Link DIR-868L 110b03
CVE-2025-63932 HIGH 7.3 MITIGATE D-Link Router DIR-868L A1 FW106KRb01.bin has an unauthenticated remote code execution vulnerability in the cgi
CVE-2025-55583 CRITICAL 9.8 MITIGATE D-Link DIR-868L B1 router firmware version FW2.05WWB02 contains an unauthenticated OS command injection vulner
CVE-2023-39668 CRITICAL 9.8 MITIGATE D-Link DIR-868L fw_revA_1-12_eu_multi_20170316 was discovered to contain a buffer overflow via the param_2 par
CVE-2023-39667 CRITICAL 9.8 MITIGATE D-Link DIR-868L fw_revA_1-12_eu_multi_20170316 was discovered to contain a buffer overflow via the param_2 par

References

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