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CVE-2026-129258

9.1, critical

A vulnerability was identified in Tenda AC18 15.03.05.05_multi/15.03.05.19 Build 6318

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
9.1, critical critical CVSS v3.1
EPSS, next 30 days
n/a
Exploitation
No public evidence
Published
14 Nov 2026yesterday

Description

A vulnerability was identified in Tenda AC18 15.03.05.05_multi/15.03.05.19 Build 6318. Affected by this vulnerability is an unknown functionality of the file /cgi-bin/upgrade of the component Firmware Upgrade Handler. Such manipulation of the argument upgradeFile leads to insufficient verification of data authenticity. The attack may be launched remotely. The exploit is publicly available and might be used.

Details

Vendor
Tenda
Product
AC18
Weakness
CWE-345 (opens in a new tab)
Status
Deferred
Updated
14 Nov 2026
Assigner
cna@vuldb.com

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

References 6

Advisories 1

Other references 5

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Tenda CVEs

Every Tenda CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2021-31755 Tenda AC11 Router Stack Buffer Overflow Vulnerability KEV EPSS 87% 9.8, critical
  • CVE-2020-10987 Tenda AC1900 Router AC15 Model Remote Code Execution Vulnerability KEV EPSS 80% 9.8, critical
  • CVE-2018-14558 Tenda AC7, AC9, and AC10 Routers Command Injection Vulnerability KEV EPSS 9% 9.8, critical
  • CVE-2026-123966 Tenda AC19 Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability EPSS 1% 10, critical
  • CVE-2026-113744 Tenda AC19 Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability EPSS 0.6% 10, critical
  • CVE-2026-114268 Tenda BE3L Pro Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability EPSS 0.5% 9.9, critical

Beyond this page

Is CVE-2026-129258 in your network?

This page tells you how dangerous CVE-2026-129258 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-129258 comes with the devices to patch.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 15 Nov 2026, not the live upstream state.