CVE-2018-12336: Undocumented Factory Backdoor in ECOS Secure Boot Stick (aka SBS) 5.6.5 allows the vendor to extract confident

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CRITICAL 9.8REMOTEMITIGATE

CVE-2018-12336 is a critical-severity flaw (CVSS 9.8) affecting secure boot stick firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Undocumented Factory Backdoor in ECOS Secure Boot Stick (aka SBS) 5.6.5 allows the vendor to extract confidential information via remote root SSH access.

Why this priority

Critical severity
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	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-200
Published	2018-06-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ecos

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

Am I affected?

Timeline

2018-06-17 16:29 UTCPublished CVE record published
2026-06-17 01:37 UTCUpdated Record last modified

ecos secure boot stick firmware MITIGATE

Affected: 5.6.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.6.5

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-2018-12336?

secure boot stick firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-12336 being exploited?

CVE-2018-12336 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-2018-12336 affect?

CVE-2018-12336 affects secure boot stick firmware. Severity is critical (CVSS 9.8). Undocumented Factory Backdoor in ECOS Secure Boot Stick (aka SBS) 5.6.5 allows the vendor to extract confidential information via remote root SSH access.

How urgent is CVE-2018-12336?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2018-12337 MEDIUM 4.6 MITIGATE Reliance on Security Through Obscurity vulnerability in ECOS Secure Boot Stick (aka SBS) 5.6.5 allows an attac
CVE-2018-12334 HIGH 7.5 MITIGATE Protection Mechanism Failure in ECOS Secure Boot Stick (aka SBS) 5.6.5 allows an attacker to compromise authen
CVE-2018-12333 HIGH 8.1 MITIGATE Insufficient Verification of Data Authenticity vulnerability in ECOS Secure Boot Stick (aka SBS) 5.6.5 allows
CVE-2018-12332 MEDIUM 4.2 MITIGATE Incomplete Cleanup vulnerability in ECOS Secure Boot Stick (aka SBS) 5.6.5 allows an attacker to compromise au
CVE-2018-12330 HIGH 8.1 MITIGATE Protection Mechanism Failure in ECOS Secure Boot Stick (aka SBS) 5.6.5 allows an attacker to compromise authen

References

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