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CVE-2021-43118

CRITICALCVSS 9.8/10EPSS 34.84%

Last modified

CVE-2021-43118 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 34.84% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
34.84%

98.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
DraytekVigor2960 Firmware1.5.1.3
DraytekVigor3900 Firmware1.5.1.3
DraytekVigor300b Firmware1.5.1.3

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2021-43118?
CVE-2021-43118 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 34.84% probability of exploitation in the next 30 days.
How do I fix CVE-2021-43118?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-43118?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST