CVE-2019-10677: Multiple Cross-Site Scripting (XSS) issues in the web interface on DASAN Zhone ZNID GPON 2426A EU version S3.1

Q: How do I fix CVE-2019-10677?

znid gpon 2426a eu firmware: upgrade to newer than s3.1.285. Exact commands for each OS are on this page.

Q: Is CVE-2019-10677 being exploited?

CVE-2019-10677 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-2019-10677 affect?

CVE-2019-10677 affects znid gpon 2426a eu firmware. Severity is medium (CVSS 6.1). Multiple Cross-Site Scripting (XSS) issues in the web interface on DASAN Zhone ZNID GPON 2426A EU version S3.1.285 devices allow a remote attacker to execute arbitrary JavaScript via manipulation of an unsanitized GET parameter: /zhndnsdisp

Q: How urgent is CVE-2019-10677?

Priority 50/100. EPSS top 6%: very likely to be exploited; Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2019-10677 is a medium-severity flaw (CVSS 6.1) affecting znid gpon 2426a eu firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple Cross-Site Scripting (XSS) issues in the web interface on DASAN Zhone ZNID GPON 2426A EU version S3.1.285 devices allow a remote attacker to execute arbitrary JavaScript via manipulation of an unsanitized GET parameter: /zhndnsdisplay.cmd (name), /wlsecrefresh.wl (wlWscCfgMethod, wl_wsc_reg).

Why this priority

EPSS top 6%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	7.3% (top 6%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-09-05
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

2019-09-05 14:15 UTCPublished CVE record published
2026-06-17 02:11 UTCUpdated Record last modified

dasanzhone znid gpon 2426a eu firmware UPGRADE

Affected: <= s3.1.285

Fixed in: newer than s3.1.285

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: DASAN Zhone ZNID GPON 2426A EU - Multiple Cross-Site Scripting

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-2019-10677?

znid gpon 2426a eu firmware: upgrade to newer than s3.1.285. Exact commands for each OS are on this page.

Is CVE-2019-10677 being exploited?

CVE-2019-10677 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-2019-10677 affect?

CVE-2019-10677 affects znid gpon 2426a eu firmware. Severity is medium (CVSS 6.1). Multiple Cross-Site Scripting (XSS) issues in the web interface on DASAN Zhone ZNID GPON 2426A EU version S3.1.285 devices allow a remote attacker to execute arbitrary JavaScript via manipulation of an unsanitized GET parameter: /zhndnsdisp

How urgent is CVE-2019-10677?

Priority 50/100. EPSS top 6%: very likely to be exploited; Public exploit reference

References

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