Exploited End of lifeCVE from 2018, added in 2022

CVE-2018-10561

DASAN Zhone (DZS) Gigabit Passive Optical Network (GPON) Routers · Home and small-office routers, cameras and IoT

Dasan GPON Routers Authentication Bypass Vulnerability

At a glance

Exploited. Added to CISA’s catalog of exploited vulnerabilities on March 31, 2022.

End-of-life product: no patch is coming. Remove it or isolate it from the network.

Affected product: DASAN Zhone (DZS) Gigabit Passive Optical Network (GPON) Routers (category Home and small-office routers, cameras and IoT, indicative classification). Name in CISA’s catalog: Dasan Gigabit Passive Optical Network (GPON) Routers.

What should I do?

This product has reached end of life: no patch is coming. Remove it or isolate it from the network.

Deadline set by CISA for US federal agencies: 21 days (due April 21, 2022). It only binds those agencies, but it is a useful measure of urgency.

The vendor’s specific advisory is listed in the NVD references: CVE-2018-10561 on the NVD website.

Original text of the required action (CISA)

The impacted product is end-of-life and should be disconnected if still in use.

Timeline

May 4, 2018 Vulnerability published Publication date (NVD)
March 31, 2022 Exploitation confirmed Added to CISA’s KEV catalog
April 21, 2022 CISA deadline Remediation deadline set for US federal agencies

The facts, with their sources

Exploitation confirmed: Yes, on March 31, 2022 Date added to the catalog of exploited vulnerabilities. Exploitation itself may have started earlier. Source: KEV catalog, collected September 29, 2026 at 14:57 UTC
Ransomware: No known use to date That does not guarantee it is not being used: the information is not public. Source: KEV catalog, collected September 29, 2026 at 14:57 UTC
Hunt for compromise: Not requested by CISA Source: KEV catalog, collected September 29, 2026 at 14:57 UTC
CISA required action: This product has reached end of life: no patch is coming. Remove it or isolate it from the network. Rewritten by this site from CISA’s original text. Source: KEV catalog, collected September 29, 2026 at 14:57 UTC
CISA deadline: April 21, 2022, 21 days Set for US federal agencies: a measure of urgency, not an obligation elsewhere. Source: KEV catalog, collected September 29, 2026 at 14:57 UTC
Vulnerability published: May 4, 2018 Source: National Vulnerability Database (NVD), collected September 29, 2026 at 15:00 UTC
Product according to CISA: Dasan Gigabit Passive Optical Network (GPON) Routers Filed by this site under “Home and small-office routers, cameras and IoT” (indicative classification). Source: KEV catalog, collected September 29, 2026 at 14:57 UTC
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Technical detail of the score: attack vector, complexity, impact. Source: National Vulnerability Database (NVD), collected September 29, 2026 at 15:00 UTC

Severity and activity

9.8 / 10 CVSS severity: critical

Score from the NVD. Collected Sep 29, 2026.

— Probability of exploitation in the next 30 days (EPSS)

FIRST’s EPSS model. Since exploitation is already confirmed, this figure is mostly useful to compare activity. Collected Sep 29, 2026.

Description

An issue was discovered on Dasan GPON home routers. It is possible to bypass authentication simply by appending "?images" to any URL of the device that requires authentication, as demonstrated by the /menu.html?images/ or /GponForm/diag_FORM?images/ URI. One can then manage the device.

Dasan GPON Routers contain an authentication bypass vulnerability. When combined with CVE-2018-10562, exploitation can allow an attacker to perform remote code execution.

Summary from CISA (KEV catalog).

CERT-FR advisories

No advisory among the latest CERT-FR publications this site follows. That does not mean there are none.

Information reused under the Open Licence 2.0 (Etalab); the date of last update is shown for each advisory. This site is neither affiliated with nor endorsed by ANSSI.

Sources for this page

CISA KEV catalog: exploitation, date added, required action, deadline, ransomware.
NVD (NIST): CVSS severity, publication date, description, vendor references.
EPSS (FIRST): probability of exploitation.
CERT-FR: advisories and alerts (in French).
Brand and category: indicative classification by this site (method).