CVE-2021-45043: HD-Network Real-time Monitoring System 2.0 allows ../ directory traversal to read /etc/shadow via the /languag

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2021-45043 is a high-severity flaw (CVSS 7.5) affecting hd-network real-time monitoring system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HD-Network Real-time Monitoring System 2.0 allows ../ directory traversal to read /etc/shadow via the /language/lang s_Language parameter.

Why this priority

High severity
EPSS top 2%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	33.1% (top 2%)
CISA exploited list	No
Weakness	CWE-22
Published	2021-12-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: hd-network real-time monitoring system project

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

Am I affected?

Timeline

2021-12-15 08:15 UTCPublished CVE record published
2026-06-17 04:13 UTCUpdated Record last modified

hd-network real-time monitoring system project hd-network real-time monitoring system DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy hd-network-real-time-monitoring-system || rpm -q hd-network-real-time-monitoring-system || hd-network-real-time-monitoring-system --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison hd-network-real-time-monitoring-system sudo apt install hd-network-real-time-monitoring-system=<VERSION_BEFORE_2.0> sudo apt-mark hold hd-network-real-time-monitoring-system

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list hd-network-real-time-monitoring-system sudo dnf downgrade hd-network-real-time-monitoring-system-<VERSION_BEFORE_2.0> sudo dnf versionlock add hd-network-real-time-monitoring-system

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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: HD-Network Real-time Monitoring System 2.0 - Local File Inclusion (LFI)
Nuclei scan template: HD-Network Realtime Monitoring System 2.0 - Local File Inclusion

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-2021-45043?

hd-network real-time monitoring system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-45043 being exploited?

CVE-2021-45043 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-2021-45043 affect?

CVE-2021-45043 affects hd-network real-time monitoring system. Severity is high (CVSS 7.5). HD-Network Real-time Monitoring System 2.0 allows ../ directory traversal to read /etc/shadow via the /language/lang s_Language parameter.

How urgent is CVE-2021-45043?

Priority 61/100. High severity; EPSS top 2%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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