RCE in Draytek Vigor2960
CVE-2021-43118
A Remote Command Injection vulnerability exists in DrayTek Vigor 2960 1.5.1.3, DrayTek Vigor 3900 1.5.1.3, and DrayTek Vigor 300B 1.5.1.3 via a crafted HTTP message containing malformed QUERY STRING in mainfunction.cgi, which could let a remote malicious user execute arbitrary code.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.348 (98.4th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.348 · newest: 0.348 · change: 0.000
Affected products
- Draytek Vigor2960
- Draytek Vigor2960 Firmware — versions 1.5.1.3
- Draytek Vigor300b
- Draytek Vigor300b Firmware — versions 1.5.1.3
- Draytek Vigor3900
- Draytek Vigor3900 Firmware — versions 1.5.1.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- gist.github.com/Cossack9989/6034c077f46e4f06d0992e9f2fae7f26 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-43118?
- CVE-2021-43118 is a critical-severity vulnerability in Draytek Vigor2960, classified under Command Injection. CVSS score: 9.8/10. Published 2022-03-29.
- How severe is CVE-2021-43118?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-43118 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.