CVE-2021-20653

Name: CVE-2021-20653
Creator: NVD / NIST
Published: 2021-02-17T03:15:12.21+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.19%

Last modified Jun 17, 2026

CVE-2021-20653 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Calsos CSDJ (CSDJ-B 01.08.00 and earlier, CSDJ-H 01.08.00 and earlier, CSDJ-D 01.08.00 and earlier, and CSDJ-A 03.08.00 and earlier) allows remote attackers to bypass access restriction and to obtain unauthorized historical data without access privileges via unspecified vectors.. EPSS estimates a 1.19% chance of exploitation in the next 30 days.

Description

Calsos CSDJ (CSDJ-B 01.08.00 and earlier, CSDJ-H 01.08.00 and earlier, CSDJ-D 01.08.00 and earlier, and CSDJ-A 03.08.00 and earlier) allows remote attackers to bypass access restriction and to obtain unauthorized historical data without access privileges via unspecified vectors.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

1.19%

64.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-276

Affected Software

Vendor	Product	Versions
Nec	Csdj-B Firmware	<= 01.08.00
Nec	Csdj-H Firmware	<= 01.08.00
Nec	Csdj-D Firmware	<= 01.08.00
Nec	Csdj-A Firmware	<= 03.08.00

References

https://jpn.nec.com/security-info/secinfo/nv21-006.htmlThird Party Advisory
https://jvn.jp/en/jp/JVN87164507/index.htmlThird Party Advisory
https://jpn.nec.com/security-info/secinfo/nv21-006.htmlThird Party Advisory
https://jvn.jp/en/jp/JVN87164507/index.htmlThird Party Advisory

Timeline

Published: Feb 17, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20653?

How severe is CVE-2021-20653?

CVE-2021-20653 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.19% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20653?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20653?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST