CVE-2020-8864: This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-L

Q: How do I fix CVE-2020-8864?

dir-878 firmware: upgrade to newer than 1.20b03; dir-882 firmware: upgrade to newer than 1.10b04; dir-867 firmware: upgrade to newer than 1.10b04. Exact commands for each OS are on this page.

Q: Is CVE-2020-8864 being exploited?

CVE-2020-8864 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-2020-8864 affect?

CVE-2020-8864 affects dir-878 firmware, dir-882 firmware, dir-867 firmware. Severity is high (CVSS 8.8). This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link DIR-867, DIR-878, and DIR-882 routers with firmware 1.10B04. Authentication is not required to exploit this vulnerability. The

Q: How urgent is CVE-2020-8864?

Priority 56/100. High severity; EPSS top 1%: very likely to be exploited

This week

HIGH 8.8UPGRADEUPGRADEUPGRADE

CVE-2020-8864 is a high-severity flaw (CVSS 8.8) affecting dir-878 firmware, dir-882 firmware, dir-867 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link DIR-867, DIR-878, and DIR-882 routers with firmware 1.10B04. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of HNAP login requests. The issue results from the lack of proper handling of empty passwords. An attacker can leverage this vulnerability to execute arbitrary code on

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	81.7% (top 1%)
CISA exploited list	No
Weakness	CWE-697
Published	2020-03-23
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: dlink

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

Am I affected?

Timeline

2020-03-23 21:15 UTCPublished CVE record published
2026-06-17 03:27 UTCUpdated Record last modified

dlink dir-878 firmware UPGRADE

Affected: <= 1.20b03

Fixed in: newer than 1.20b03

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-882 firmware UPGRADE

Affected: <= 1.10b04

Fixed in: newer than 1.10b04

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-867 firmware UPGRADE

Affected: <= 1.10b04

Fixed in: newer than 1.10b04

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-2020-8864?

dir-878 firmware: upgrade to newer than 1.20b03; dir-882 firmware: upgrade to newer than 1.10b04; dir-867 firmware: upgrade to newer than 1.10b04. Exact commands for each OS are on this page.

Is CVE-2020-8864 being exploited?

CVE-2020-8864 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-2020-8864 affect?

CVE-2020-8864 affects dir-878 firmware, dir-882 firmware, dir-867 firmware. Severity is high (CVSS 8.8). This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link DIR-867, DIR-878, and DIR-882 routers with firmware 1.10B04. Authentication is not required to exploit this vulnerability. The

How urgent is CVE-2020-8864?

Priority 56/100. High severity; EPSS top 1%: very likely to be exploited

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2025-60676 MEDIUM 6.5 MITIGATE An unauthenticated command injection vulnerability exists in the D-Link DIR-878A1 router firmware FW101B04.bin
CVE-2025-60674 MEDIUM 6.8 MITIGATE A stack buffer overflow vulnerability exists in the D-Link DIR-878A1 router firmware FW101B04.bin in the rc bi
CVE-2025-60673 MEDIUM 6.5 MITIGATE An unauthenticated command injection vulnerability exists in the D-Link DIR-878A1 router firmware FW101B04.bin
CVE-2025-60672 MEDIUM 6.5 MITIGATE An unauthenticated command injection vulnerability exists in the D-Link DIR-878A1 router firmware FW101B04.bin
CVE-2025-0481 MEDIUM 5.3 MITIGATE A vulnerability classified as problematic has been found in D-Link DIR-878 1.03

References

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