CVE-2023-26921

Name: CVE-2023-26921
Creator: NVD / NIST
Published: 2023-04-04T15:15:09.143+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.69%

Last modified Jun 17, 2026

CVE-2023-26921 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. OS Command Injection vulnerability in quectel AG550QCN allows attackers to execute arbitrary commands via ql_atfwd.. EPSS estimates a 2.69% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.69%

84.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Quectel	Ag550qcn Firmware	All versions

References

https://github.com/closethe/AG550QCN_CommandInjection_ql_atfwd/blob/main/README.mdExploit, Third Party Advisory
https://github.com/closethe/AG550QCN_CommandInjection_ql_atfwd/blob/main/README.mdExploit, Third Party Advisory

Timeline

Published: Apr 4, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-26921?

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

How severe is CVE-2023-26921?

CVE-2023-26921 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.69% probability of exploitation in the next 30 days.

How do I fix CVE-2023-26921?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-26921?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST