CVE-2026-7854: A security vulnerability has been detected in D-Link DI-8100 16.07.26A1

This week

CRITICAL 9.8REMOTEMITIGATE

CVE-2026-7854 is a critical-severity flaw (CVSS 9.8) affecting di-8100 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A security vulnerability has been detected in D-Link DI-8100 16.07.26A1. Affected by this vulnerability is the function url_rule_asp of the file /url_rule.asp of the component POST Parameter Handler. Such manipulation leads to buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used.

Why this priority

Critical severity
EPSS top 7%: very likely to be exploited
Public exploit reference
CISA SSVC: automatable with total technical impact
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	5.9% (top 7%)
CISA exploited list	No
Weakness	CWE-119, CWE-120
Published	2026-05-05
Last modified	2026-07-24

Publisher (CNA): VulDB · Vendor: dlink

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-05 19:16 UTCPublished CVE record published
2026-07-24 08:10 UTCUpdated Record last modified

dlink di-8100 firmware MITIGATE

Affected: 16.07.26a1

Fixed in: no fixed release known

Safe to downgrade to: a release before 16.07.26a1

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · fzssh · FIXED · 1.4.0-2.fc46 · FEDORA-2026-8004fcd067 · source

sudo dnf upgrade --advisory=FEDORA-2026-8004fcd067

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/draw-ctf/report/blob/main/DI-8100/url_rule_asp_overflow.md

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-2026-7854?

di-8100 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-7854 being exploited?

CVE-2026-7854 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-2026-7854 affect?

CVE-2026-7854 affects di-8100 firmware. Severity is critical (CVSS 9.8). A security vulnerability has been detected in D-Link DI-8100 16.07.26A1. Affected by this vulnerability is the function url_rule_asp of the file /url_rule.asp of the component POST Parameter Handler. Such manipulation leads to buffer overfl

How urgent is CVE-2026-7854?

Priority 71/100. Critical severity; EPSS top 7%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2026-7247 HIGH 7.2 MITIGATE A vulnerability has been found in D-Link DI-8100 16.07.26A1
CVE-2026-7248 CRITICAL 9.8 MITIGATE A vulnerability was found in D-Link DI-8100 16.07.26A1
CVE-2026-7853 CRITICAL 9.8 MITIGATE A weakness has been identified in D-Link DI-8100 16.07.26A1
CVE-2026-7856 HIGH 7.2 MITIGATE A flaw has been found in D-Link DI-8100 16.07.26A1
CVE-2026-7857 HIGH 7.2 MITIGATE A vulnerability has been found in D-Link DI-8100 16.07.26A1

References

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