HOMEVULNERABILITIESCVE-2026-5339
HIGH

CVE-2026-5339

CWE-74Published: April 2, 2026· Updated: Apr 6, 2026

8.8
CVSS v3.1
EPSS:0.47%probability of exploitation in 30 daysPercentile:64.4th

Official Description

A vulnerability was detected in Tenda G103 1.0.0.5. The impacted element is the function action_set_net_settings of the file gpon.lua of the component Setting Handler. Performing a manipulation of the argument authLoid/authLoidPassword/authPassword/authSerialNo/authType/oltType/usVlanId/usVlanPriority results in command injection. It is possible to initiate the attack remotely. The exploit is now public and may be used.

NVD Source

Technical Analysis

CVE-2026-5339 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

tenda2 products
g103 firmwareg103
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/ZZ2266/.github.io/tree/main/Tenda%20G103/authLoid
ADVISORYhttps://vuldb.com/submit/781132
ADVISORYhttps://vuldb.com/submit/781133
ADVISORYhttps://vuldb.com/submit/781134
ADVISORYhttps://vuldb.com/submit/781135
ADVISORYhttps://vuldb.com/submit/781142
ADVISORYhttps://vuldb.com/submit/781143
ADVISORYhttps://vuldb.com/submit/781144
ADVISORYhttps://vuldb.com/submit/781145
ADVISORYhttps://vuldb.com/vuln/354670

All References (12)

→
https://github.com/ZZ2266/.github.io/tree/main/Tenda%20G103/authLoidExploit · Third Party Advisory
→
https://vuldb.com/submit/781132Third Party Advisory · VDB Entry
→
https://vuldb.com/submit/781133Third Party Advisory · VDB Entry
→
https://vuldb.com/submit/781134Third Party Advisory · VDB Entry
→
https://vuldb.com/submit/781135Third Party Advisory · VDB Entry
→
https://vuldb.com/submit/781142Third Party Advisory · VDB Entry
→
https://vuldb.com/submit/781143Third Party Advisory · VDB Entry
→
https://vuldb.com/submit/781144Third Party Advisory · VDB Entry
→
https://vuldb.com/submit/781145Third Party Advisory · VDB Entry
→
https://vuldb.com/vuln/354670Third Party Advisory · VDB Entry
→
https://vuldb.com/vuln/354670/ctiPermissions Required · VDB Entry
→
https://www.tenda.com.cn/Product

Quick Facts

CVE IDCVE-2026-5339
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-74
CISA KEVNo
EPSS (30d)0.47%
Affected1 vendor
PublishedApr 2, 2026

Related CVEs (CWE-74)

CVE-2026-4470
9.8
CVE-2026-5020
9.8
CVE-2026-5256
9.8
CVE-2026-5176
9.8
CVE-2026-5033
9.8
CVE-2026-5019
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-5339 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2026-5339·NVD