HOMEVULNERABILITIESCVE-2026-5103
HIGH

CVE-2026-5103

CWE-74Published: March 30, 2026· Updated: Mar 30, 2026

8.8
CVSS v3.1
EPSS:1.63%probability of exploitation in 30 daysPercentile:81.8th

Official Description

A weakness has been identified in Totolink A3300R 17.0.0cu.557_b20221024. This issue affects the function setUPnPCfg of the file /cgi-bin/cstecgi.cgi. This manipulation of the argument enable causes command injection. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks.

NVD Source

Technical Analysis

CVE-2026-5103 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

totolink2 products
a3300r firmwarea3300r
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/LvHongW/Vuln-of-totolink_A3300R/tree/main/A3300R_enable_cmd_inject
ADVISORYhttps://vuldb.com/vuln/354128
ADVISORYhttps://vuldb.com/vuln/354128/cti

All References (5)

→
https://github.com/LvHongW/Vuln-of-totolink_A3300R/tree/main/A3300R_enable_cmd_injectExploit · Third Party Advisory
→
https://vuldb.com/submit/779140Permissions Required · VDB Entry
→
https://vuldb.com/vuln/354128Third Party Advisory · VDB Entry
→
https://vuldb.com/vuln/354128/ctiThird Party Advisory · VDB Entry
→
https://www.totolink.net/Product

Quick Facts

CVE IDCVE-2026-5103
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-74
CISA KEVNo
EPSS (30d)1.63%
Affected1 vendor
PublishedMar 30, 2026

Related CVEs (CWE-74)

CVE-2026-4210
9.8
CVE-2026-4164
9.8
CVE-2026-4196
9.8
CVE-2026-4195
9.8
CVE-2026-4206
9.8
CVE-2026-4163
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-5103 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.
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