CVE-2023-27388: Improper authentication vulnerability in T&D Corporation and ESPEC MIC CORP

This month

CRITICAL 9.8REMOTEMITIGATEMITIGATEMITIGATE

CVE-2023-27388 is a critical-severity flaw (CVSS 9.8) affecting tr-71w firmware, tr-72w firmware, rtr-5w firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper authentication vulnerability in T&D Corporation and ESPEC MIC CORP. data logger products allows a remote unauthenticated attacker to login to the product as a registered user. Affected products and versions are as follows: T&D Corporation data logger products (TR-71W/72W all firmware versions, RTR-5W all firmware versions, WDR-7 all firmware versions, WDR-3 all firmware versions, and WS-2 all firmware versions), and ESPEC MIC CORP. data

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	1.3% (top 31%)
CISA exploited list	No
Weakness	CWE-287, CWE-863
Published	2023-05-23
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: tandd

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

Am I affected?

Timeline

2023-05-23 02:15 UTCPublished CVE record published
2026-06-17 05:44 UTCUpdated Record last modified

tandd tr-71w firmware MITIGATE

Affected: all versions

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.

tandd tr-72w firmware MITIGATE

Affected: all versions

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.

tandd rtr-5w firmware MITIGATE

Affected: all versions

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.

tandd wdr-7 firmware MITIGATE

Affected: all versions

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.

tandd wdr-3 firmware MITIGATE

Affected: all versions

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.

tandd ws-2 firmware MITIGATE

Affected: all versions

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.

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-2023-27388?

tr-71w firmware: mitigate or apply the listed mitigation; tr-72w firmware: mitigate or apply the listed mitigation; rtr-5w firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-27388 being exploited?

CVE-2023-27388 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-2023-27388 affect?

CVE-2023-27388 affects tr-71w firmware, tr-72w firmware, rtr-5w firmware. Severity is critical (CVSS 9.8). Improper authentication vulnerability in T&D Corporation and ESPEC MIC CORP. data logger products allows a remote unauthenticated attacker to login to the product as a registered user. Affected products and versions are as follows: T&D Corp

How urgent is CVE-2023-27388?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-27387 HIGH 8.8 MITIGATE MITIGATE Cross-site request forgery (CSRF) in T&D Corporation and ESPEC MIC CORP
CVE-2023-23545 MEDIUM 5.3 MITIGATE MITIGATE Missing authentication for critical function exists in T&D Corporation and ESPEC MIC CORP
CVE-2023-22654 MEDIUM 5.4 MITIGATE MITIGATE Client-side enforcement of server-side security issue exists in T&D Corporation and ESPEC MIC CORP

References

← Back to latest CVEs