CVE-2026-7857: A vulnerability has been found in D-Link DI-8100 16.07.26A1

This month

HIGH 7.2MITIGATE

CVE-2026-7857 is a high-severity flaw (CVSS 7.2) affecting di-8100 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability has been found in D-Link DI-8100 16.07.26A1. This vulnerability affects the function sprintf of the file /user_group.asp of the component CGI Handler. The manipulation leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.

Why this priority

High severity
EPSS top 9%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	4.2% (top 9%)
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 20:16 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.

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-2026-7857?

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

Is CVE-2026-7857 being exploited?

CVE-2026-7857 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-2026-7857 affect?

CVE-2026-7857 affects di-8100 firmware. Severity is high (CVSS 7.2). A vulnerability has been found in D-Link DI-8100 16.07.26A1. This vulnerability affects the function sprintf of the file /user_group.asp of the component CGI Handler. The manipulation leads to buffer overflow. The attack may be initiated re

How urgent is CVE-2026-7857?

Priority 53/100. High severity; EPSS top 9%: very likely to be exploited; Public exploit reference

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-2025-52222 HIGH 7.5 MITIGATE MITIGATE D-Link DI-8003 v16.07.26A1, DI-8500 v16.07.26A1; DI-8003G v17.12.21A1, DI-8200G v17.12.20A1, DI-8200 v16.07.26
CVE-2026-7854 CRITICAL 9.8 MITIGATE A security vulnerability has been detected 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

References

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