CVE-2026-76590Public exploitNetwork attack vector

Memory corruption via PPPoE password overflow

Published Aug 19, 2026 · Updated Aug 19, 2026

Stack-based buffer overflow in wan.cgi in TRENDnet TEW-755AP 20260702 and earlier allows attackers to corrupt memory via the PPPoE password field. The ssi handler reads the cameo.wan.wan_pppoe_password_00 POST parameter and writes it into a fixed-size stack buffer with sprintf, as shown in the referenced technical report and proof-of-concept. Reachability is over the web management interface, and the published CVSS vectors require valid credentials; the demonstrated outcome is memory corruption and likely service interruption from stack overwrite.

CVSS severity9.9
Critical
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stack-based buffer overflow in wan.cgi in TRENDnet TEW-755AP 20260702 and earlier allows attackers to corrupt memory via the PPPoE password field. The ssi handler reads the cameo.wan.wan_pppoe_password_00 POST parameter and writes it into a fixed-size stack buffer with sprintf, as shown in the referenced technical report and proof-of-concept. Reachability is over the web management interface, and the published CVSS vectors require valid credentials; the demonstrated outcome is memory corruption and likely service interruption from stack overwrite.

The record

CVE
CVE-2026-76590
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
TRENDnet
Product
TEW-755AP
Classifications
CWE-119, CWE-121, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=20260702

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TRENDnet · TEW-755APversion=20260702

Published CVSS scores

9.9VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
8.6VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo