CVE-2021-43118Vigor2960 Firmware Command Injection
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…
Published Mar 29, 2022 · Updated Nov 21, 2024
Key Facts
Patch in the next maintenance window- CVE-2021-43118 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Vigor2960 Firmware (Draytek), Vigor300b Firmware (Draytek), Vigor3900 Firmware (Draytek).
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 35% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
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)
35%
Higher than 98.4% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
37/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Description
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.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Vigor2960 FirmwareDraytek | 1.5.1.3 | n/a |
| Vigor300b FirmwareDraytek | 1.5.1.3 | n/a |
| Vigor3900 FirmwareDraytek | 1.5.1.3 | n/a |
Timeline
Publicly disclosed
Mar 29, 2022
Last updated
Nov 21, 2024
Weakness Type
- CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection')
References
- exploitgist.github.com · 6034c07
FAQ
Common Questions.
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.
Affected: Vigor2960 Firmware (Draytek) versions 1.5.1.3; Vigor300b Firmware (Draytek) versions 1.5.1.3; Vigor3900 Firmware (Draytek) versions 1.5.1.3. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
Is CVE-2021-43118 On Your Attack Surface?
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