/cgi-bin/activate.cgi on Draytek Vigor3900, Vigor2960, and Vigor300B devices before 1.5.1 allows remote attackers to achieve command inject…

published 2020-03-26 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-3232

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 39.4%; EPSS 39.4% chance of exploitation in 30 days, percentile 98%
public exploits: 0; none known

/cgi-bin/activate.cgi on Draytek Vigor3900, Vigor2960, and Vigor300B devices before 1.5.1 allows remote attackers to achieve command injection via a remote HTTP request in DEBUG mode.

Patch / fix

fixed in 3

draytek vigor300b_firmware 1.5.1
draytek vigor3900_firmware 1.5.1
draytek vigor2960_firmware 1.5.1

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: total
Assessed: 18 mo ago (2025-04-23)

Exploit prediction

39.39% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

slashd.ga https://slashd.ga/2020/03/draytek-vulnerabilities/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	10.0	AV:N/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness

CWE-77 Improper Neutralization of Special Elements used in a Command

References

slashd.ga /2020/03/draytek-vulnerabilities/
exploit, third-party-advisory
draytek.com /about/security-advisory/vigor3900-/-vigor2960-/-vigor300b-stack-based-buffer-overflow-vulnerability/
vendor-advisory

Sources

CVE List CVE-2020-10826
NVD CVE-2020-10826

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary