CVE-2021-26752: NeDi 1.9C allows an authenticated user to execute operating system commands in the Nodes Traffic function on t

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HIGH 8.8DOWNGRADE

CVE-2021-26752 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 execute operating system commands in the Nodes Traffic function on the endpoint /Nodes-Traffic.php via the md or ag HTTP GET parameter. This allows an attacker to obtain access to the operating system where NeDi is installed and to all application data.

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	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-78
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-2021-26752?

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

Is CVE-2021-26752 being exploited?

CVE-2021-26752 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-2021-26752 affect?

CVE-2021-26752 affects nedi. Severity is high (CVSS 8.8). NeDi 1.9C allows an authenticated user to execute operating system commands in the Nodes Traffic function on the endpoint /Nodes-Traffic.php via the md or ag HTTP GET parameter. This allows an attacker to obtain access to the operating syst

How urgent is CVE-2021-26752?

Priority 54/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

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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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