An issue was discovered on Dasan GPON home routers.

published 2018-05-04 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-2634

cvss: 9.8; version 3.1, CNA
cisa kev: Exploited; added 2022-03-31, used in ransomware
epss: 99.9%; EPSS 99.9% chance of exploitation in 30 days, percentile 99.9%
public exploits: 1; Exploit-DB, plus a Nuclei check

An issue was discovered on Dasan GPON home routers. Command Injection can occur via the dest_host parameter in a diag_action=ping request to a GponForm/diag_Form URI. Because the router saves ping results in /tmp and transmits them to the user when the user revisits /diag.html, it's quite simple to execute commands and retrieve their output.

Patch / fix

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

Timeline

2018-05-03 First public exploit (EDB-44576)
2018-05-04 Published
2022-03-31 Added to CISA KEV
2022-04-21 CISA patch deadline
2025-02-04 CISA SSVC: exploitation active

Known exploited

Added: 4 y ago (2022-03-31)
Patch by: 2022-04-21 (4 y ago)
Ransomware: Known to be used in ransomware campaigns
Required action: The impacted product is end-of-life and should be disconnected if still in use.
Vendor, product: Dasan, Gigabit Passive Optical Network (GPON) Routers
CISA name: Dasan GPON Routers Command Injection Vulnerability

CISA SSVC

Exploitation: Active, exploited in the wild
Automatable: yes
Technical impact: total
Assessed: 21 mo ago (2025-02-04)

Exploit prediction

99.95% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

EDB-44576 GPON Routers - Authentication Bypass / Command Injection remote, 2018-05-03
Nuclei template Dasan GPON Devices - Remote Code Execution nuclei detection template
vpnmentor.com https://www.vpnmentor.com/blog/critical-vulnerability-gpon-router/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

exploit-db.com /exploits/44576/
exploit, third-party-advisory, vdb-entry
vpnmentor.com /blog/critical-vulnerability-gpon-router/
exploit, technical-description, third-party-advisory
securityfocus.com /bid/107053
vdb-entry, broken-link, third-party-advisory
cisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-10562
government-resource, us-government-resource

Sources

CVE List CVE-2018-10562
NVD CVE-2018-10562

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary