HOMEVULNERABILITIESCVE-2026-5355
HIGH

CVE-2026-5355

CWE-77Published: April 2, 2026· Updated: Apr 7, 2026

8.8
CVSS v3.1
EPSS:1.06%probability of exploitation in 30 daysPercentile:77.6th

Official Description

A vulnerability has been found in Trendnet TEW-657BRM 1.00.1. Affected by this issue is the function vpn_drop of the file /setup.cgi. The manipulation of the argument policy_name leads to os command injection. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used. The vendor confirms, that "[t]he product in question (...) has been discontinued and end of life since June 23, 2011, that is more than 14 years ago. We no longer provide support for this product, so we are not able to confirm the vulnerabilities. We will make an announcement on our website's product support page and notify customers who registered their products with us." This vulnerability only affects products that are no longer supported by the maintainer.

NVD Source

Technical Analysis

CVE-2026-5355 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

trendnet2 products
tew-657brm firmwaretew-657brm
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/panda666-888/vuls/blob/main/trendnet/tew-657brm/vpn_drop.md
ADVISORYhttps://vuldb.com/submit/781569
ADVISORYhttps://vuldb.com/vuln/354708

All References (4)

→
https://github.com/panda666-888/vuls/blob/main/trendnet/tew-657brm/vpn_drop.mdExploit · Third Party Advisory
→
https://vuldb.com/submit/781569Third Party Advisory · VDB Entry
→
https://vuldb.com/vuln/354708Third Party Advisory · VDB Entry
→
https://vuldb.com/vuln/354708/ctiPermissions Required · VDB Entry

Quick Facts

CVE IDCVE-2026-5355
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-77
CISA KEVNo
EPSS (30d)1.06%
Affected1 vendor
PublishedApr 2, 2026

Related CVEs (CWE-77)

CVE-2025-15379
10.0
CVE-2026-26068
9.9
CVE-2026-20186
9.9
CVE-2026-20147
9.9
CVE-2026-45663
9.9
CVE-2026-52806
KEV9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-5355 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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