Is CVE-2026-1623 actively exploited?

Yes. KEV Intelligence has observed exploitation attempts targeting this CVE. Confidence is confirmed.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence sensors have observed 2 exploitation attempts, 1 unique attacker IP, and 1 country targeting CVE-2026-1623. First observed Jul 30, 2026; last observed Aug 07, 2026.

Which versions are affected?

CVE-2026-1623 affects Totolink A7000R. Reported affected version: 4.1cu.4154.

How should organizations remediate it?

Prioritize immediate patching and validate internet-facing exposure. Monitor for matching exploitation attempts in your environment.

No. CVE-2026-1623 is not currently listed in CISA KEV.

Vulnerability report

Active exploitation observed Confirmed confidence Not in CISA KEV

CVE-2026-1623

Totolink A7000R cstecgi.cgi setUpgradeFW command injection

TOTOLINK / A7000R · 4.1cu.4154

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Severity: CVSS 5.3 · Medium
Confidence: Confirmed
Exploit status: Observed in sensors
EPSS: 2.2%
First observed: 30 Jul 2026
Last observed: 07 Aug 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-1623 is Totolink A7000R cstecgi.cgi setUpgradeFW command injection. A weakness has been identified in Totolink A7000R 4.1cu.4154. Impacted is the function setUpgradeFW of the file /cgi-bin/cstecgi.cgi. This...

Is it exploited?

Yes. KEV Intelligence sensors observed exploitation attempts with confirmed confidence.

Who is affected?

Totolink / A7000R 4.1cu.4154.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

A weakness has been identified in Totolink A7000R 4.1cu.4154

A weakness has been identified in Totolink A7000R 4.1cu.4154. Impacted is the function setUpgradeFW of the file /cgi-bin/cstecgi.cgi. This manipulation of the argument FileName causes command injection.

The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks.

Vendor Product Affected Status

Totolink A7000R 4.1cu.4154 Affected

View vendor advisory

Published: 29 Jan 2026
Exploitation Reported: 30 Jul 2026
Attack vector: Remote
Complexity: Low
Privileges: Low
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-1623
GitHub — xyh4ck/iot_poc github.com · Patch https://github.com/xyh4ck/iot_poc/blob/main/TOTOLINK/A7000R/04_RCE_se...
GitHub — xyh4ck/iot_poc github.com · Patch https://github.com/xyh4ck/iot_poc/blob/main/TOTOLINK/A7000R/04_RCE_se...
Submit #740767 | TOTOLINK A7000R V4.1cu.4154 Command Injection vuldb.com · Third-Party Advisory https://vuldb.com/?submit.740767
VDB-343382 | Totolink A7000R cstecgi.cgi setUpgradeFW command injection vuldb.com · Technical Description https://vuldb.com/?id.343382
Product — totolink.net totolink.net · Product https://www.totolink.net/
VDB-343382 | CTI Indicators (IOB, IOC, TTP, IOA) vuldb.com · Signature https://vuldb.com/?ctiid.343382

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

KEV Intelligence

Recorded 30 Jul 2026

Independent exploitation attestation added to the KEV Intelligence record.

Active exploitation observed

KEV Intelligence sensor

First observed 30 Jul 2026

First-party sensor telemetry confirms matching exploitation attempts.

Proof of concept available

Recorded 16 Jan 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source	Added
KEV Intelligence First	2026-07-30 05:53 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Aggregate observations show the scale, recency, and distribution of activity without overstating sparse data.

Attempts observed

Unique attacker IPs

Attacker countries

Sensors observed

Exploitation attempts over the last 22 days

Daily events observed by KEV Intelligence sensors

Updated 19 Aug 2026

29 Jul 3 Aug 8 Aug 13 Aug 19 Aug

First observed 30 Jul 2026 · Last observed 07 Aug 2026

Pro adds sensor region and window summaries. Enterprise adds raw IPs, paths, User-Agents, and payloads.

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Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 1
User-Agents: 1

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

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Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

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Risk and context

Severity, weaknesses, and research context

CVSS v4.0

5.3 Medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

EPSS

2.2%

Weaknesses

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') CWE-74 Improper Neutralization of Special Elements used in a Command ('Command Injection') CWE-77

All CVSS Scores

CVSS v4.0 5.3 Medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

CVSS v3.1 6.3 Medium

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

CVSS v3.0 6.3 Medium

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

CVSS v2.0 6.5 Medium

AV:N/AC:L/Au:S/C:P/I:P/A:P

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

04_RCE_setUpgradeFW_RCE.md

public · Created 2026-01-16 07:53:00 UTC

Timeline

From disclosure to observed exploitation

30 Jul 2026
Observed by KEV Intelligence sensors

Evidence-backed exploitation signal
30 Jul 2026
Indicator of compromise added

Indicators of compromise recorded
29 Jan 2026
CVE published

Vulnerability disclosed publicly
29 Jan 2026
CVE ID reserved

Identifier reserved by the CNA
16 Jan 2026
Public PoC available

Public proof-of-concept code published

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-1623

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2026-1623",
  "confidence": "Confirmed",
  "cvss_score": 5.3,
  "cvss_estimated": false,
  "epss_score": 0.0218,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 2, "sensors": 1 }
}

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