CVE-2021-33895: ETINET BACKBOX E4.09 and H4.09 mismanages password access control

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HIGH 8.1REMOTEMITIGATEMITIGATE

CVE-2021-33895 is a high-severity flaw (CVSS 8.1) affecting backbox h4.09 firmware, backbox e4.09 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ETINET BACKBOX E4.09 and H4.09 mismanages password access control. When a user uses the User ID of the process running BBSV to login to the Backbox UI application, the system procedure (USER_AUTHENTICATE_) used for verifying the Password returns 0 (no error). The reason is that the user is not running the XYGate application. Hence, BBSV assumes the Password is correct. For H4.09, the affected version isT0954V04^AAO. For E4.09, the affected versio

Why this priority

High severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-287
Published	2021-06-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: etinet · hpe

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

Am I affected?

Timeline

2021-06-25 14:15 UTCPublished CVE record published
2026-06-17 03:55 UTCUpdated Record last modified

hpe backbox h4.09 firmware MITIGATE

Affected: t0954v04\^aao

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

etinet backbox e4.09 firmware MITIGATE

Affected: 2020-09-22

Fixed in: no fixed release known

Safe to downgrade to: a release before 2020-09-22

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2021-33895?

backbox h4.09 firmware: mitigate or apply the listed mitigation; backbox e4.09 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-33895 being exploited?

CVE-2021-33895 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-2021-33895 affect?

CVE-2021-33895 affects backbox h4.09 firmware, backbox e4.09 firmware. Severity is high (CVSS 8.1). ETINET BACKBOX E4.09 and H4.09 mismanages password access control. When a user uses the User ID of the process running BBSV to login to the Backbox UI application, the system procedure (USER_AUTHENTICATE_) used for verifying the Password re

How urgent is CVE-2021-33895?

Priority 48/100. High severity; Remotely exploitable, no login, no user action

References

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