CVE-2020-10828Vigor2960 Firmware Out-of-Bounds Write
A stack-based buffer overflow in cvmd on Draytek Vigor3900, Vigor2960, and Vigor300B devices before 1.5.1 allows remote attackers to achieve code execution via a remote HTTP request.
Published Mar 26, 2020 · Updated May 5, 2025
Key Facts
Patch immediately- CVE-2020-10828 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Vigor2960 Firmware (Draytek), Vigor300b Firmware (Draytek), Vigor3900 Firmware (Draytek).
- It is exploited in the wild, listed in Industry KEV feed since Jan 12, 2022. A public exploit is reported by tracking sources, but no code link is listed yet.
- EPSS estimates a 21% probability of exploitation in the next 30 days.
- Fixed versions are available, including Vigor2960 Firmware 1.5.1, Vigor300b Firmware 1.5.1, Vigor3900 Firmware 1.5.1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
21%
Higher than 97.5% of all scored CVEs
Exploit maturity
Exploited (KEV)
ATLAS score
47/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Jan 12, 2022
657 days after publication
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Exploited (KEV)
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
8
Reports of active use
Description
A stack-based buffer overflow in cvmd on Draytek Vigor3900, Vigor2960, and Vigor300B devices before 1.5.1 allows remote attackers to achieve code execution via a remote HTTP request.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Jan 12, 2022 | n/a | Not reported |
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Vigor2960 FirmwareDraytek | See advisory | 1.5.1 |
| Vigor300b FirmwareDraytek | See advisory | 1.5.1 |
| Vigor3900 FirmwareDraytek | See advisory | 1.5.1 |
Patched Releases
Vigor2960 Firmware
1.5.1
Vigor300b Firmware
1.5.1
Vigor3900 Firmware
1.5.1
Timeline
Publicly disclosed
Mar 26, 2020
Added to Industry KEV feed
Jan 12, 2022
Last updated
May 5, 2025
Weakness Type
- CWE-787 Out-of-bounds Write
References
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
A stack-based buffer overflow in cvmd on Draytek Vigor3900, Vigor2960, and Vigor300B devices before 1.5.1 allows remote attackers to achieve code execution via a remote HTTP request.
Affected: Vigor2960 Firmware (Draytek); Vigor300b Firmware (Draytek); Vigor3900 Firmware (Draytek). The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Jan 12, 2022.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
A public exploit is reported by tracking sources, but no code link is listed yet.
Fixed versions are available, including Vigor2960 Firmware 1.5.1, Vigor300b Firmware 1.5.1, Vigor3900 Firmware 1.5.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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