CVE-2021-42911: draytek vigor2960
CVSS: 9.8v3.1CriticalModified
Published 29-03-2022Last modified 04-08-2024
Vulnerability summary
CVE-2021-42911 is a critical (CVSS 9.8) vulnerability in draytek vigor2960. EPSS estimates a 3.52% chance of exploitation in the next 30 days, higher than 89.1% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
3.52%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Timeline
- 29-03-2022PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
2 scores · 1 source · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesSingle source
High 7.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
3.52%
Chance of exploitation in the next 30 days
Percentile
89%
Versus all other CVEs
30-day change
0.00 pp
From 3.52% on 21-09-2026
21-09-202621-10-2026
EPSS score3.52%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundE9C1C2D2E69B773Ca4251Acdd77F2835
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Draytek3 products
- vigor2960≤ 1.5.1.3
- vigor300b_firmware≤ 1.5.1.3
- vigor3900_firmware≤ 1.5.1.3
1 vendor · 3 products
References
1 links- gist.github.com/Cossack9989/e9c1c2d2e69b773ca4251acdd77f2835X Refsource MISCExploitThird Party Advisory