Vulnerability Details : CVE-2021-42911
Potential exploit
A Format String 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 in the mainfunction.cgi file via a crafted HTTP message containing malformed QUERY STRING, which could let a remote malicious user execute arbitrary code.
Vulnerability category: OverflowExecute code
Products affected by CVE-2021-42911
- cpe:2.3:o:draytek:vigor300b_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:draytek:vigor3900_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:draytek:vigor2960_firmware:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-42911
12.54%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 94 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-42911
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.5
|
HIGH | AV:N/AC:L/Au:N/C:P/I:P/A:P |
10.0
|
6.4
|
NIST | |
|
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST |
CWE ids for CVE-2021-42911
-
The product uses a function that accepts a format string as an argument, but the format string originates from an external source.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-42911
-
https://gist.github.com/Cossack9989/e9c1c2d2e69b773ca4251acdd77f2835
draytek-vigor-fsb-vuln.md ยท GitHubExploit;Third Party Advisory
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