CVE-2023-26921

CRITICALNVD 9.89.8—Elevated

9.8

OS Command Injection vulnerability in quectel AG550QCN allows attackers to execute arbitrary commands via ql_atfwd.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 91.2%
KEV: Not listed

Published

April 4, 2023

Last Modified

February 13, 2025

Advisory Details (1)

Auto-updated Jun 1, 2026

No patch confirmed yet.

generic

AG550QCN_CommandInjection_ql_atfwd/README.md at main · closethe/AG550QCN_CommandInjection_ql_atfwd · GitHub

https://github.com/closethe/AG550QCN_CommandInjection_ql_atfwd/blob/main/README.md

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-78OS Command Injection

Data Freshness Timeline

(refreshed 13× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

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Frequently asked(5)

What is CVE-2023-26921?

CVE-2023-26921 is a critical vulnerability published on April 4, 2023. OS Command Injection vulnerability in quectel AG550QCN allows attackers to execute arbitrary commands via ql_atfwd.

When was CVE-2023-26921 disclosed?

CVE-2023-26921 was first published in the National Vulnerability Database on April 4, 2023, with the most recent update on February 13, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-26921 actively exploited?

CVE-2023-26921 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 91.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-26921?

CVE-2023-26921 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2023-26921?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-26921, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2023-26921

📅 Published

🔄 Last Modified

📋 Advisory Details (1)

AG550QCN_CommandInjection_ql_atfwd/README.md at main · closethe/AG550QCN_CommandInjection_ql_atfwd · GitHub

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-26921?

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Advisory Details (1)

Frequently asked(5)

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