Vulnerability report

Active exploitation observed Confirmed confidence Not in CISA KEV

CVE-2023-26801

BL-AC1900_2.0 Command Injection

LB-LINK / BL-AC1900_2.0

View live feed Monitor via API Watch CVE-2023-26801
Severity
CVSS 9.8 · Critical
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
69.7%
First observed
25 Jun 2026
Last observed
10 Sep 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2023-26801 is an unauthenticated vulnerability affecting LB-LINK BL-AC1900_2.0 and 3 other products. LB-LINK BL-AC1900_2.0 v1.0.1, LB-LINK BL-WR9000 v2.4.9, LB-LINK BL-X26 v1.2.5, and LB-LINK BL-LTE300 v1.0.8 were...

Is it exploited?

Yes. Previdian sensors observed exploitation attempts with confirmed confidence. Also confirmed by third-party sources.

Who is affected?

LB-LINK / BL-AC1900_2.0.

What should we do?

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

Overview

BL-AC1900_2.0 Command Injection

LB-LINK BL-AC1900_2.0 v1.0.1, LB-LINK BL-WR9000 v2.4.9, LB-LINK BL-X26 v1.2.5, and LB-LINK BL-LTE300 v1.0.8 were discovered to contain a command injection vulnerability via the mac, time1, and time2 parameters at /goform/set_LimitClient_cfg.

Published
26 Mar 2023
Exploitation Reported
22 Apr 2025
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

CVE References

Exploitation evidence

Why Previdian 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

The Shadowserver

Recorded 22 Apr 2025

A trusted third party reported exploitation.

Active exploitation observed

Previdian sensor

First observed 25 Jun 2026

Previdian first observed exploitation attempts targeting this vulnerability in our honeypot sensors.

Known exploited vulnerability sources

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

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Source Added
The Shadowserver First 2025-04-28 00:00 UTC
Previdian 2026-06-29 06:51 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Previdian sensors recorded exploitation attempts targeting this vulnerability. The cards and chart show volume, unique attackers, and daily activity.

63

Attempts observed

6

Unique attacker IPs

3

Attacker countries

DE · NL · US

2

Sensors observed

CVE-2023-26801 exploitation attempts over the last 80 days

Daily events observed by Previdian sensors

Updated 11 Sep 2026

0
1
3
2
2
2
6
5
4
0
5
6
5
3
3
3
3
8
2
2
3
4
4
7
4
3
4
10
4
3
1
3
3
11
10
3
2
6
6
7
4
2
1
2
2
0
0
4
1
1
1
1
1
0
2
1
2
2
2
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0
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0
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0
1
0
24 Jun 10 Jul 26 Jul 11 Aug 11 Sep

First observed 25 Jun 2026 · Last observed 10 Sep 2026

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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
User-Agents
Callback hosts
1
2
6

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian 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 v3.1

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

EPSS

69.7%

Weaknesses

Improper Neutralization of Special Elements used in a Command ('Command Injection') CWE-77

Timeline

From disclosure to observed exploitation

  1. Indicators of compromise added (7)

    Indicators of compromise recorded

  2. Observed by Previdian sensors

    Evidence-backed exploitation signal

  3. Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  4. CVE published

    Vulnerability disclosed publicly

  5. CVE ID reserved

    Identifier reserved by the CNA

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-2023-26801

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2023-26801",
  "confidence": "Confirmed",
  "cvss_score": 9.8,
  "cvss_estimated": false,
  "epss_score": 0.69663,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 63, "sensors": 2 }
}