CVE-2019-9125: An issue was discovered on D-Link DIR-878 1.12B01 devices

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CRITICAL 9.8REMOTEMITIGATE

CVE-2019-9125 is a critical-severity flaw (CVSS 9.8) affecting dir-878 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered on D-Link DIR-878 1.12B01 devices. Because strncpy is misused, there is a stack-based buffer overflow vulnerability that does not require authentication via the HNAP_AUTH HTTP header.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.0% (top 13%)
CISA exploited list	No
Weakness	CWE-306, CWE-787
Published	2019-02-25
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

2019-02-25 05:29 UTCPublished CVE record published
2026-06-17 02:43 UTCUpdated Record last modified

d-link dir-878 firmware MITIGATE

Affected: 1.12b01

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.12b01

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-2019-9125?

dir-878 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-9125 being exploited?

CVE-2019-9125 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-2019-9125 affect?

CVE-2019-9125 affects dir-878 firmware. Severity is critical (CVSS 9.8). An issue was discovered on D-Link DIR-878 1.12B01 devices. Because strncpy is misused, there is a stack-based buffer overflow vulnerability that does not require authentication via the HNAP_AUTH HTTP header.

How urgent is CVE-2019-9125?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

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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