CVE-2021-44080: A Command Injection vulnerability in httpd web server (setup.cgi) in SerComm h500s, FW: lowi-h500s-v3.4.22 all

This week

HIGH 7.2MITIGATE

CVE-2021-44080 is a high-severity flaw (CVSS 7.2) affecting h500s firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Command Injection vulnerability in httpd web server (setup.cgi) in SerComm h500s, FW: lowi-h500s-v3.4.22 allows logged in administrators to arbitrary OS commands as root in the device via the connection_type parameter of the statussupport_diagnostic_tracing.json endpoint.

Why this priority

High severity
EPSS top 2%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	24.9% (top 2%)
CISA exploited list	No
Weakness	CWE-78
Published	2022-06-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sercomm

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

Am I affected?

Timeline

2022-06-02 14:15 UTCPublished CVE record published
2026-06-17 04:11 UTCUpdated Record last modified

sercomm h500s firmware MITIGATE

Affected: lowi-h500s-v3.4.22

Fixed in: no fixed release known

Safe to downgrade to: a release before lowi-h500s-v3.4.22

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.

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-2021-44080?

h500s firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-44080 being exploited?

CVE-2021-44080 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-2021-44080 affect?

CVE-2021-44080 affects h500s firmware. Severity is high (CVSS 7.2). A Command Injection vulnerability in httpd web server (setup.cgi) in SerComm h500s, FW: lowi-h500s-v3.4.22 allows logged in administrators to arbitrary OS commands as root in the device via the connection_type parameter of the statussupport

How urgent is CVE-2021-44080?

Priority 55/100. High severity; EPSS top 2%: very likely to be exploited; Public exploit reference

Software pages

Apache HTTP Server vulnerabilities

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References

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