Quectel EG25-G devices through 202006130814 allow executing arbitrary code remotely by using an AT command to place shell metacharacters in quectel_handle_fumo_cfg input in atfwd_daemon.
CVE-2021-31698
CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence
Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.8
- EG Score
- 9.8(medium)
- EPSS
- 77.5%
- KEV
- Not listed
Published
August 12, 2021
Last Modified
November 21, 2024
Advisory Details (1)
Auto-updated Jul 2, 2026No patch confirmed yet.
generic
Code execution as root via AT commands on the Quectel EG25-G modem | nns.ee
https://nns.ee/blog/2021/04/03/modem-rce.htmlFrequently asked(5)
What is CVE-2021-31698?
CVE-2021-31698 is a critical vulnerability published on August 12, 2021. Quectel EG25-G devices through 202006130814 allow executing arbitrary code remotely by using an AT command to place shell metacharacters in quectelhandlefumocfg input in atfwddaemon.
When was CVE-2021-31698 disclosed?
CVE-2021-31698 was first published in the National Vulnerability Database on August 12, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-31698 actively exploited?
CVE-2021-31698 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 77.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-31698?
CVE-2021-31698 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-31698?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-31698, 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
Explore the affected products and dependency analysis for CVE-2021-31698
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