CVE-2021-34543

Name: CVE-2021-34543
Creator: NVD / NIST
Published: 2021-12-07T21:15:08.177+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.88%

Last modified Jun 17, 2026

CVE-2021-34543 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The web administration server in Solar-Log 500 before 2.8.2 Build 52 does not require authentication, which allows remote attackers to gain administrative privileges by connecting to the server. As a result, the attacker can modify configuration files and change the system status. EPSS estimates a 2.88% chance of exploitation in the next 30 days.

Description

The web administration server in Solar-Log 500 before 2.8.2 Build 52 does not require authentication, which allows remote attackers to gain administrative privileges by connecting to the server. As a result, the attacker can modify configuration files and change the system status. Fixed with 3.0.0-60 11.10.2013 for SL 200, 500, 1000 / not existing for SL 250, 300, 1200, 2000, SL 50 Gateway, SL Base.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.88%

85.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-306

Affected Software

Vendor	Product	Versions	Update
Bkw	Solar-Log 500 Firmware	<= 2.8.1	—
Bkw	Solar-Log 500 Firmware	2.8.2	Build 50

References

https://drive.google.com/file/d/1z1TaANlDyX4SOP2vjNzkPQI3nETL9kZM/view?usp=sharingExploit, Third Party Advisory
https://www.exploit-db.com/exploits/49986Exploit, Third Party Advisory, VDB Entry
https://www.solar-log.com/en/support/firmware/Product, Release Notes, Vendor Advisory
https://drive.google.com/file/d/1z1TaANlDyX4SOP2vjNzkPQI3nETL9kZM/view?usp=sharingExploit, Third Party Advisory
https://www.exploit-db.com/exploits/49986Exploit, Third Party Advisory, VDB Entry
https://www.solar-log.com/en/support/firmware/Product, Release Notes, Vendor Advisory

Timeline

Published: Dec 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34543?

How severe is CVE-2021-34543?

CVE-2021-34543 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.88% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34543?

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-2021-34543?

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

Scan your code now

Source: NVD / NIST