CVE-2014-7858: The check_login function in D-Link DNR-326 before 2.10 build 03 allows remote attackers to bypass authenticati

Q: How do I fix CVE-2014-7858?

dnr-326 firmware: upgrade to newer than 1.40b03. Exact commands for each OS are on this page.

Q: Is CVE-2014-7858 being exploited?

CVE-2014-7858 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-2014-7858 affect?

CVE-2014-7858 affects dnr-326 firmware. Severity is critical (CVSS 9.8). The check_login function in D-Link DNR-326 before 2.10 build 03 allows remote attackers to bypass authentication and log in by setting the username cookie parameter to an arbitrary string.

Q: How urgent is CVE-2014-7858?

Priority 63/100. Critical severity; EPSS top 3%: very likely to be exploited; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2014-7858 is a critical-severity flaw (CVSS 9.8) affecting dnr-326 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The check_login function in D-Link DNR-326 before 2.10 build 03 allows remote attackers to bypass authentication and log in by setting the username cookie parameter to an arbitrary string.

Why this priority

Critical severity
EPSS top 3%: 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	15.2% (top 3%)
CISA exploited list	No
Weakness	CWE-287
Published	2017-08-25
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

2017-08-25 18:29 UTCPublished CVE record published
2026-06-17 00:15 UTCUpdated Record last modified

d-link dnr-326 firmware UPGRADE

Affected: <= 1.40b03

Fixed in: newer than 1.40b03

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-2014-7858?

dnr-326 firmware: upgrade to newer than 1.40b03. Exact commands for each OS are on this page.

Is CVE-2014-7858 being exploited?

CVE-2014-7858 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-2014-7858 affect?

CVE-2014-7858 affects dnr-326 firmware. Severity is critical (CVSS 9.8). The check_login function in D-Link DNR-326 before 2.10 build 03 allows remote attackers to bypass authentication and log in by setting the username cookie parameter to an arbitrary string.

How urgent is CVE-2014-7858?

Priority 63/100. Critical severity; EPSS top 3%: very likely to be exploited; Remotely exploitable, no login, no user action

Software pages

D-Link vulnerabilities

Related CVEs

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References

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