CVE-2021-26751: NeDi 1.9C allows an authenticated user to perform a SQL Injection in the Monitoring History function on the en

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HIGH 8.8DOWNGRADE

CVE-2021-26751 is a high-severity flaw (CVSS 8.8) affecting nedi. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NeDi 1.9C allows an authenticated user to perform a SQL Injection in the Monitoring History function on the endpoint /Monitoring-History.php via the det HTTP GET parameter. This allows an attacker to access all the data in the database and obtain access to the NeDi application.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-89
Published	2021-02-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nedi

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

Am I affected?

Timeline

2021-02-12 21:15 UTCPublished CVE record published
2026-06-17 03:43 UTCUpdated Record last modified

nedi nedi DOWNGRADE

Affected: 1.9c

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.9c

1. Check installed version

apt-cache policy nedi || rpm -q nedi || nedi --version

2. No fixed release: DOWNGRADE to a release before 1.9c (Debian / Ubuntu)

apt-cache madison nedi sudo apt install nedi=<VERSION_BEFORE_1.9c> sudo apt-mark hold nedi

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

dnf --showduplicates list nedi sudo dnf downgrade nedi-<VERSION_BEFORE_1.9c> sudo dnf versionlock add nedi

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.

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-2021-26751?

nedi: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-26751 being exploited?

CVE-2021-26751 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-2021-26751 affect?

CVE-2021-26751 affects nedi. Severity is high (CVSS 8.8). NeDi 1.9C allows an authenticated user to perform a SQL Injection in the Monitoring History function on the endpoint /Monitoring-History.php via the det HTTP GET parameter. This allows an attacker to access all the data in the database and

How urgent is CVE-2021-26751?

Priority 53/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2022-40895 CRITICAL 9.1 UPGRADE UPGRADE In certain Nedi products, a vulnerability in the web UI of NeDi login & Community login could allow an unauthe
CVE-2021-26753 CRITICAL 9.9 DOWNGRADE NeDi 1.9C allows an authenticated user to inject PHP code in the System Files function on the endpoint /System
CVE-2021-26752 HIGH 8.8 DOWNGRADE NeDi 1.9C allows an authenticated user to execute operating system commands in the Nodes Traffic function on t
CVE-2020-15037 MEDIUM 5.4 DOWNGRADE NeDi 1.9C is vulnerable to cross-site scripting (XSS) attack
CVE-2020-15036 MEDIUM 5.4 DOWNGRADE NeDi 1.9C is vulnerable to cross-site scripting (XSS) attack

References

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