What’s Vulnerable › Vulnerabilities

CVE-2020-6989

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-03-24 · updated 2026-06-17
• Weakness: CWE-121

Description

In Moxa PT-7528 series firmware, Version 4.0 or lower, and PT-7828 series firmware, Version 3.9 or lower, a buffer overflow in the web server allows remote attackers to cause a denial-of-service condition or execute arbitrary code.

Affected products

• Moxa Pt-7528-12Msc-12Tx-4Gsfp-Hv-Hv Firmware: through 4.0
• Moxa Pt-7528-12Msc-12Tx-4Gsfp-Hv Firmware: through 4.0
• Moxa Pt-7528-12Msc-12Tx-4Gsfp-Wv-Wv Firmware: through 4.0
• Moxa Pt-7528-12Msc-12Tx-4Gsfp-Wv Firmware: through 4.0
• Moxa Pt-7528-12Mst-12Tx-4Gsfp-Hv-Hv Firmware: through 4.0
• Moxa Pt-7528-12Mst-12Tx-4Gsfp-Hv Firmware: through 4.0
• Moxa Pt-7528-12Mst-12Tx-4Gsfp-Wv-Wv Firmware: through 4.0
• Moxa Pt-7528-12Mst-12Tx-4Gsfp-Wv Firmware: through 4.0
• Moxa Pt-7528-16Msc-8Tx-4Gsfp-Hv-Hv Firmware: through 4.0
• Moxa Pt-7528-16Msc-8Tx-4Gsfp-Hv Firmware: through 4.0
• Moxa Pt-7528-16Msc-8Tx-4Gsfp-Wv-Wv Firmware: through 4.0
• Moxa Pt-7528-16Msc-8Tx-4Gsfp-Wv Firmware: through 4.0
• Moxa Pt-7528-16Mst-8Tx-4Gsfp-Hv-Hv Firmware: through 4.0
• Moxa Pt-7528-16Mst-8Tx-4Gsfp-Hv Firmware: through 4.0
• Moxa Pt-7528-16Mst-8Tx-4Gsfp-Wv-Wv Firmware: through 4.0
• Moxa Pt-7528-16Mst-8Tx-4Gsfp-Wv Firmware: through 4.0
• Moxa Pt-7528-20Msc-4Tx-4Gsfp-Hv-Hv Firmware: through 4.0
• Moxa Pt-7528-20Msc-4Tx-4Gsfp-Hv Firmware: through 4.0
• Moxa Pt-7528-20Msc-4Tx-4Gsfp-Wv-Wv Firmware: through 4.0
• Moxa Pt-7528-20Msc-4Tx-4Gsfp-Wv Firmware: through 4.0
• Moxa Pt-7528-20Mst-4Tx-4Gsfp-Hv-Hv Firmware: through 4.0
• Moxa Pt-7528-20Mst-4Tx-4Gsfp-Hv Firmware: through 4.0
• Moxa Pt-7528-20Mst-4Tx-4Gsfp-Wv-Wv Firmware: through 4.0
• Moxa Pt-7528-20Mst-4Tx-4Gsfp-Wv Firmware: through 4.0
• Moxa Pt-7528-24Tx-Hv-Hv Firmware: through 4.0
• Moxa Pt-7528-24Tx-Hv Firmware: through 4.0
• Moxa Pt-7528-24Tx-Wv-Hv Firmware: through 4.0
• Moxa Pt-7528-24Tx-Wv-Wv Firmware: through 4.0
• Moxa Pt-7528-24Tx-Wv Firmware: through 4.0
• Moxa Pt-7528-8Msc-16Tx-4Gsfp-Hv-Hv Firmware: through 4.0

References

• https://www.us-cert.gov/ics/advisories/icsa-20-056-03
• https://www.us-cert.gov/ics/advisories/icsa-20-056-03

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