What’s Vulnerable › Vulnerabilities

CVE-2020-8809

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-02-25 · updated 2026-06-17
• Weakness: CWE-494

Description

Gurux GXDLMS Director prior to 8.5.1905.1301 downloads updates to add-ins and OBIS code over an unencrypted HTTP connection. A man-in-the-middle attacker can prompt the user to download updates by modifying the contents of gurux.fi/obis/files.xml and gurux.fi/updates/updates.xml. Then, the attacker can modify the contents of downloaded files. In the case of add-ins (if the user is using those), this will lead to code execution. In case of OBIS codes (which the user is always using as they are needed to communicate with the energy meters), this can lead to code execution when combined with CVE-2020-8810.

Affected products

• Gurux Device Language Message Specification Director: before 8.5.1905.1301 — fixed in 8.5.1905.1301

How to fix

Upgrade to a fixed version: Gurux Device Language Message Specification Director 8.5.1905.1301. Check the vendor advisory for mitigations.

References

• https://github.com/seqred-s-a/gxdlmsdirector-cve
• https://seqred.pl/en/cve-gurux-gxdlms-director/
• https://github.com/seqred-s-a/gxdlmsdirector-cve
• https://seqred.pl/en/cve-gurux-gxdlms-director/

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