CVE-2021-35508: NMSAccess32.exe in TeraRecon AQNetClient 4.4.13 allows attackers to execute a malicious binary with SYSTEM pri

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HIGH 8.8DOWNGRADE

CVE-2021-35508 is a high-severity flaw (CVSS 8.8) affecting aquariusnet. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NMSAccess32.exe in TeraRecon AQNetClient 4.4.13 allows attackers to execute a malicious binary with SYSTEM privileges via a low-privileged user account. To exploit this, a low-privileged user must change the service configuration or overwrite the binary service.

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-732
Published	2021-09-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: terarecon

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

Am I affected?

Timeline

2021-09-01 14:15 UTCPublished CVE record published
2026-06-17 03:57 UTCUpdated Record last modified

terarecon aquariusnet DOWNGRADE

Affected: 4.4.13

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.4.13

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.4.13 (Debian / Ubuntu)

apt-cache madison aquariusnet sudo apt install aquariusnet=<VERSION_BEFORE_4.4.13> sudo apt-mark hold aquariusnet

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

dnf --showduplicates list aquariusnet sudo dnf downgrade aquariusnet-<VERSION_BEFORE_4.4.13> sudo dnf versionlock add aquariusnet

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-2021-35508?

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

Is CVE-2021-35508 being exploited?

CVE-2021-35508 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-2021-35508 affect?

CVE-2021-35508 affects aquariusnet. Severity is high (CVSS 8.8). NMSAccess32.exe in TeraRecon AQNetClient 4.4.13 allows attackers to execute a malicious binary with SYSTEM privileges via a low-privileged user account. To exploit this, a low-privileged user must change the service configuration or overwri

How urgent is CVE-2021-35508?

Priority 54/100. High severity; Public exploit reference

References

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