CVE-2019-7439: cgi-bin/qcmap_web_cgi on JioFi 4G M2S 1.0.2 devices allows a DoS (Hang) via the mask POST parameter.

This month

MEDIUM 6.5MITIGATE

CVE-2019-7439 is a medium-severity flaw (CVSS 6.5) affecting jiofi 4g m2s firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

cgi-bin/qcmap_web_cgi on JioFi 4G M2S 1.0.2 devices allows a DoS (Hang) via the mask POST parameter.

Why this priority

EPSS top 8%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.8% (top 8%)
CISA exploited list	No
Published	2019-03-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jio

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-03-21 16:01 UTCPublished CVE record published
2026-06-17 02:40 UTCUpdated Record last modified

jio jiofi 4g m2s firmware MITIGATE

Affected: 1.0.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.2

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: JioFi 4G M2S 1.0.2 - Denial of Service

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-7439?

jiofi 4g m2s firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-7439 being exploited?

CVE-2019-7439 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-7439 affect?

CVE-2019-7439 affects jiofi 4g m2s firmware. Severity is medium (CVSS 6.5). cgi-bin/qcmap_web_cgi on JioFi 4G M2S 1.0.2 devices allows a DoS (Hang) via the mask POST parameter.

How urgent is CVE-2019-7439?

Priority 51/100. EPSS top 8%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2019-7440 MEDIUM 6.5 MITIGATE JioFi 4G M2S 1.0.2 devices have CSRF via the SSID name and Security Key field under Edit Wi-Fi Settings (aka a
CVE-2019-7438 MEDIUM 6.1 MITIGATE cgi-bin/qcmap_web_cgi on JioFi 4G M2S 1.0.2 devices has XSS and HTML injection via the mask POST parameter.

References

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