CVE-2020-10823

CRITICAL

9.8

CVSS Score

Published: March 26, 2020 at 04:04 PM UTC

Updated: June 17, 2026 at 02:48 AM UTC

6 products affected across 1 vendorVIGOR3900 FirmwareVIGOR2960 FirmwareVIGOR300B Firmware

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Severity

CRITICAL9.8

Exploit prediction

EPSS 4%

SSVC

PoC

Description

A stack-based buffer overflow in /cgi-bin/activate.cgi through var parameter on Draytek Vigor3900, Vigor2960, and Vigor300B devices before 1.5.1 allows remote attackers to achieve code execution via a remote HTTP request (issue 1 of 3).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

VIGOR2960 Firmware · Draytek

95%

v < 1.5.1

Affected range stops below 1.5.1, so it looks safe — our inference, not a vendor statement

draytek-vigor2960 (same device)

VIGOR300B Firmware · Draytek

95%

v < 1.5.1

Affected range stops below 1.5.1, so it looks safe — our inference, not a vendor statement

VIGOR3900 Firmware · Draytek

95%

v < 1.5.1

Affected range stops below 1.5.1, so it looks safe — our inference, not a vendor statement

Vigor300B · Draytek

90%

v < 1.5.1

Affected range stops below 1.5.1, so it looks safe — our inference, not a vendor statement

Vigor2960 · Draytekdevice

80%

All versions

Vigor3900 · Draytekdevice

80%

All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

x_refsource_MISCExploitThird Party Advisory

Source: [email protected]

https://slashd.ga/2020/03/draytek-vulnerabilities/

x_refsource_CONFIRM

Source: [email protected]

https://www.draytek.com/about/security-advisory/vigor3900-/-vigor2960-/-vigor300b-stack-based-buffer-overflow-vulnerability/

SSVC — Action Prioritization

SSVCPoCAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.8CRITICALCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-787

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