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CVE-2021-40407

82
FAUCET Score

CVE-2021-40407 is an OS command injection vulnerability in the device network settings of Reolink RLC-410W v3.0.0.136_20121102. An attacker can exploit this by sending a crafted HTTP request to the SetDdns API, as the ddns->domain variable is not properly validated. This vulnerability has a CVSS score of 7.2 (High), indicating a network-based attack with low complexity, requiring high privileges, and leading to high impact on confidentiality, integrity, and availability. Notably, this CVE is actively exploited (KEV listed) and has garnered significant community discussion, despite no public exploit code or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
3.0.0.136_20121102CPE matchmatch criteria
cpe:2.3:o:reolink:rlc-410w_firmware:3.0.0.136_20121102:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.1CRITICAL

CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.3
Impact Score
6.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
47.91%
Probability of exploitation in next 30 days
EPSS Percentile
98.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
Added to KEV · Dec 18, 2024
This CVE's current EPSS score of 0.4792 is in the 98th percentile among its peer group of 5,528 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.3 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
talosintelligence.com / vulnerability_reports/TALOS-2021-1424
ExploitThird Party Advisory