High Injection

CVE-2026-19983 — GL.iNet XE3000 NAS Command Service gl_nas_sys os command injection

A vulnerability was detected in GL.iNet A1300, AX1800, AXT1800, MT2500, MT3000, MT6000, X3000 and XE3000 4.8.x. This issue affects some unknown processing of the file /usr/bin/gl_nas_sys of the component NAS Command Service. The manipulation results in os command injection. The attack may be launched remotely. Upgrading to version 4.9.0 is capable of addressing this issue. It is suggested to upgrade the affected component. The vendor explains: "After our investigation, we have confirmed that the vulnerability described (...) does indeed exist."

Published Aug 17, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: VulDB

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

Technical severity (high)+6
Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

—

No EPSS score.

Affects

GL.iNet

A1300 and 7 more

CVSS base

8.3

High · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

Yes

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (GL.iNet A1300, GL.iNet AX1800, GL.iNet AXT1800…).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (injection), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
GL.iNet	A1300	version 4.8.*	Vulnerable	CVE Program (cve.org) e CISA ADP
GL.iNet	AX1800	version 4.8.*	Vulnerable	CVE Program (cve.org) e CISA ADP
GL.iNet	AXT1800	version 4.8.*	Vulnerable	CVE Program (cve.org) e CISA ADP
GL.iNet	MT2500	version 4.8.*	Vulnerable	CVE Program (cve.org) e CISA ADP
GL.iNet	MT3000	version 4.8.*	Vulnerable	CVE Program (cve.org) e CISA ADP
GL.iNet	MT6000	version 4.8.*	Vulnerable	CVE Program (cve.org) e CISA ADP
GL.iNet	X3000	version 4.8.*	Vulnerable	CVE Program (cve.org) e CISA ADP
GL.iNet	XE3000	version 4.8.*	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

Low

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
6.9	CVSS 4.0	Medium	—	—	cna@vuldb.com via NIST National Vulnerability Database
6.9	CVSS 4.0	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP
8.3	CVSS 3.1	High	3.9	3.7	cna@vuldb.com via NIST National Vulnerability Database
8.3	CVSS 3.1	High	—	—	VulDB via CVE Program (cve.org) e CISA ADP
8.3	CVSS 3.0	High	—	—	VulDB via CVE Program (cve.org) e CISA ADP
7.5	CVSS 2.0	High	10.0	6.4	cna@vuldb.com via NIST National Vulnerability Database
7.5	CVSS 2.0	High	—	—	VulDB via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L (score shown at the top: cna@vuldb.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-77 · Command Injection

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Look for parameters with command/query metacharacters and unexpected child processes of the service.

web/proxy/WAF logsnetwork IDS/IPSapplication logsendpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

2026
Affected products added · gl.inet/a1300, gl.inet/ax1800, gl.inet/axt1800, gl.inet/mt2500, gl.inet/mt3000, gl.inet/mt6000, gl.inet/x3000, gl.inet/x
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 15, 2026
CVSS changed · 8.3
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Deferred
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Aug 17, 2026 · VulDB

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

5 on the record

vuldb.com/vuln/391165
vdb-entry, NIST National Vulnerability Database
vuldb.com/vuln/391165/cti
signature, permissions-required, NIST National Vulnerability Database
vuldb.com/cve/CVE-2026-19983
third-party-advisory, NIST National Vulnerability Database
vuldb.com/submit/873919
third-party-advisory, NIST National Vulnerability Database
github.com/gl-inet/CVE-issues/blob/main/4.0.0/NAS%20Host-header%20bypass%20to%20
related, NIST National Vulnerability Database

Elsewhere on this site

GL.iNet
every CVE for this vendor

Injection
same class

CWE-77
other pages naming this weakness

Related CVEs (same products)

High CVE-2026-19982 GL.iNet BE9300/MT6000 Firewall-management RPC os command injection Aug 17, 2026
High CVE-2026-19980 GL.iNet XE3000 Language Update ui.update_langs code injection Aug 17, 2026
High CVE-2026-19981 GL.iNet XE3000 Wi-Fi Timer Power-Schedule Feature os command injection Aug 17, 2026
High CVE-2026-19979 GL.iNet XE3000 WebDAV Service MOVE authorization Aug 17, 2026
High CVE-2026-18787 GL.iNet AX1800 RPC Endpoint oui-rpc.lua remove_rule command injection Aug 4, 2026
Medium CVE-2026-18585 GL.iNet MT2500 APPS-NAS nas-web.get_file_list heap-based overflow Aug 3, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No FIRST EPSS score.
No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-19983 is "GL.iNet XE3000 NAS Command Service gl_nas_sys os command injection", rated High. It affects A1300 (GL.iNet); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 8.3 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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