CVE-2023-26999: An issue found in NetScout nGeniusOne v.6.3.4 allows a remote attacker to execute arbitrary code and cause a d

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2023-26999 is a critical-severity flaw (CVSS 9.8) affecting ngeniusone. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue found in NetScout nGeniusOne v.6.3.4 allows a remote attacker to execute arbitrary code and cause a denial of service via a crafted file.

Why this priority

Critical severity
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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-611
Published	2024-01-09
Last modified	2026-07-09

Publisher (CNA): MITRE · Vendor: netscout

Last updated 2026-07-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-01-09 02:15 UTCPublished CVE record published
2026-07-09 01:18 UTCUpdated Record last modified

netscout ngeniusone DOWNGRADE

Affected: 6.3.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.3.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 6.3.4 (Debian / Ubuntu)

apt-cache madison ngeniusone sudo apt install ngeniusone=<VERSION_BEFORE_6.3.4> sudo apt-mark hold ngeniusone

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

dnf --showduplicates list ngeniusone sudo dnf downgrade ngeniusone-<VERSION_BEFORE_6.3.4> sudo dnf versionlock add ngeniusone

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-2023-26999?

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

Is CVE-2023-26999 being exploited?

CVE-2023-26999 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-2023-26999 affect?

CVE-2023-26999 affects ngeniusone. Severity is critical (CVSS 9.8). An issue found in NetScout nGeniusOne v.6.3.4 allows a remote attacker to execute arbitrary code and cause a denial of service via a crafted file.

How urgent is CVE-2023-26999?

Priority 60/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-27000 MEDIUM 6.1 DOWNGRADE Cross Site Scripting vulnerability found in NetScoutnGeniusOne v.6.3.4 allows a remote attacker to execute arb
CVE-2023-26998 MEDIUM 5.4 DOWNGRADE Cross Site Scripting vulnerability found in NetScoutnGeniusOne v.6.3.4 allows a remote attacker to execute arb
CVE-2025-32986 HIGH 7.5 UPGRADE NETSCOUT nGeniusONE before 6.4.0 b2350 has a Sensitive File Accessible Without Proper Authentication to an end
CVE-2025-32985 CRITICAL 9.8 UPGRADE NETSCOUT nGeniusONE before 6.4.0 b2350 has Hardcoded Credentials that can be obtained from JAR files.
CVE-2025-32984 MEDIUM 6.1 UPGRADE NETSCOUT nGeniusONE before 6.4.0 b2350 allows Stored Cross-Site Scripting (XSS) via a certain POST parameter.

References

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