CVE-2014-8356: The web administrative portal in Zhone zNID 2426A before S3.0.501 allows remote authenticated users to bypass

Q: How do I fix CVE-2014-8356?

znid 2426a firmware: upgrade to s3.0.501. Exact commands for each OS are on this page.

Q: Is CVE-2014-8356 being exploited?

CVE-2014-8356 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-2014-8356 affect?

CVE-2014-8356 affects znid 2426a firmware. Severity is high (CVSS 8.8). The web administrative portal in Zhone zNID 2426A before S3.0.501 allows remote authenticated users to bypass intended access restrictions via a modified server response, related to an insecure direct object reference.

Q: How urgent is CVE-2014-8356?

Priority 59/100. High severity; EPSS top 7%: very likely to be exploited; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2014-8356 is a high-severity flaw (CVSS 8.8) affecting znid 2426a firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The web administrative portal in Zhone zNID 2426A before S3.0.501 allows remote authenticated users to bypass intended access restrictions via a modified server response, related to an insecure direct object reference.

Why this priority

High severity
EPSS top 7%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	5.6% (top 7%)
CISA exploited list	No
Weakness	CWE-639
Published	2019-11-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dasanzhone

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

Am I affected?

Timeline

2019-11-21 22:15 UTCPublished CVE record published
2026-06-17 00:16 UTCUpdated Record last modified

dasanzhone znid 2426a firmware UPGRADE

Affected: < s3.0.501

Fixed in: s3.0.501

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.

Public exploits and detection

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

Exploit-DB: ZHONE < S3.0.501 - Multiple Vulnerabilities

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-2014-8356?

znid 2426a firmware: upgrade to s3.0.501. Exact commands for each OS are on this page.

Is CVE-2014-8356 being exploited?

CVE-2014-8356 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-2014-8356 affect?

CVE-2014-8356 affects znid 2426a firmware. Severity is high (CVSS 8.8). The web administrative portal in Zhone zNID 2426A before S3.0.501 allows remote authenticated users to bypass intended access restrictions via a modified server response, related to an insecure direct object reference.

How urgent is CVE-2014-8356?

Priority 59/100. High severity; EPSS top 7%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2014-9118 HIGH 8.8 MITIGATE The web administrative portal in Zhone zNID GPON 2426A before S3.0.501 allows remote attackers to execute arbi
CVE-2014-8357 HIGH 8.8 UPGRADE backupsettings.html in the web administrative portal in Zhone zNID GPON 2426A before S3.0.501 places a session

References

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