MEDIUM
CVE-2021-40404
CWE-284Published: January 28, 2022· Updated: Jun 17, 2026
6.5
CVSS v3.1
Official Description
An authentication bypass vulnerability exists in the cgiserver.cgi Login functionality of reolink RLC-410W v3.0.0.136_20121102. A specially-crafted HTTP request can lead to authentication bypass. An attacker can send an HTTP request to trigger this vulnerability.
Technical Analysis
CVE-2021-40404 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Affected Vendors & Products
reolink2 product(s)
rlc-410w firmwarerlc-410w
Source: NVD CPE · 2 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (2)
→
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1420Exploit · Third Party Advisory
→
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1420Exploit · Third Party Advisory
Quick Facts
CVE IDCVE-2021-40404
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-284
CISA KEVNo
Affected1 vendor(s)
PublishedJan 28, 2022
Related CVEs (CWE-284)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-40404 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.