CVE-2020-27556: A predictable device ID in BASETech GE-131 BT-1837836 firmware 20180921 allows unauthenticated remote attacker

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MEDIUM 5.3REMOTEMITIGATE

CVE-2020-27556 is a medium-severity flaw (CVSS 5.3) affecting ge-131 bt-1837836 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A predictable device ID in BASETech GE-131 BT-1837836 firmware 20180921 allows unauthenticated remote attackers to connect to the device.

Why this priority

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	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-330
Published	2020-11-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: basetech

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

Am I affected?

Timeline

2020-11-17 15:15 UTCPublished CVE record published
2026-06-17 03:09 UTCUpdated Record last modified

basetech ge-131 bt-1837836 firmware MITIGATE

Affected: 20180921

Fixed in: no fixed release known

Safe to downgrade to: a release before 20180921

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-2020-27556?

ge-131 bt-1837836 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-27556 being exploited?

CVE-2020-27556 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-2020-27556 affect?

CVE-2020-27556 affects ge-131 bt-1837836 firmware. Severity is medium (CVSS 5.3). A predictable device ID in BASETech GE-131 BT-1837836 firmware 20180921 allows unauthenticated remote attackers to connect to the device.

How urgent is CVE-2020-27556?

Priority 45/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-27558 MEDIUM 6.5 MITIGATE Use of an undocumented user in BASETech GE-131 BT-1837836 firmware 20180921 allows remote attackers to view th
CVE-2020-27557 MEDIUM 5.5 MITIGATE Unprotected Storage of Credentials vulnerability in BASETech GE-131 BT-1837836 firmware 20180921 allows local
CVE-2020-27555 CRITICAL 9.8 MITIGATE Use of default credentials for the telnet server in BASETech GE-131 BT-1837836 firmware 20180921 allows remote
CVE-2020-27554 HIGH 7.5 MITIGATE Cleartext Transmission of Sensitive Information vulnerability in BASETech GE-131 BT-1837836 firmware 20180921
CVE-2020-27553 HIGH 7.5 MITIGATE In BASETech GE-131 BT-1837836 firmware 20180921, the web-server on the system is configured with the option “D

References

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