CVE-2020-6989
No exploitation reported by the sources we read.
- Published2020-03-24
- WeaknessCWE-121 · CWE-787
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2020-03-2419:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-6989?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-6989?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 4.0 | ≤ 4.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 4.0 | ≤ 4.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 4.0 | ≤ 4.0 | no fix published | NVD |
52 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Moxa PT-7528 and PT-7828 Series Ethernet Switches
PT-7528 series: firmware Version 4.0 or lower · PT-7828 series: firmware Version 3.9 or lower
Fix
- Mitigation from the vendor CISA ICSA-20-056-03 · 2 productsMoxa has developed a solution to address these vulnerabilities: Please contact Moxa Technical Support for a security patch.
- Mitigation from the vendor CISA ICSA-20-056-03 · 2 productsMoxa also recommends that users apply the security patch and enable “Account Login Failure Lockout” functions to eliminate any potential risk.
- Mitigation from the vendor CISA ICSA-20-056-03 · 2 productsPlease see Moxa's security advisory for more information.
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- NVDCVSS 3.19.8read 2026-10-23
- NVDCVSS 2.07.5read 2026-10-23
- CNAweakness (CWE)CWE-121read 2026-10-23
- NVDweakness (CWE)CWE-787read 2026-10-23
- FIRST EPSSEPSS score3.5 %2026-10-22
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2020-03-24
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2020-6989?
Is CVE-2020-6989 actively exploited?
What is the CVSS score for CVE-2020-6989?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.