CVE-2021-40407: Reolink RLC-410W IP Camera OS Command Injection Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 18 Dec 2024, 1,055 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 47.6%
EPSS score, percentile 98.8 of all scored records
- How severe?
- 9.1 Critical
CVSS v3.0 base score, given by the CNA
- What should I do?
Required action (CISA), due 8 Jan 2025: The impacted product could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization if a current mitigation is unavailable.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Not stated. The CVE record gives vendor and product as “n/a” and the version as “unspecified”.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by CISA
The impacted product could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization if a current mitigation is unavailable.
CISA due date for this action: 8 January 2025.
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
Linked from CISA's catalog entry
- https://reolink.com/product-eol/
- https://reolink.com/download-center/
- https://nvd.nist.gov/vuln/detail/CVE-2021-40407
Affected products and versions
The CVE record does not name affected products or versions: vendor and product are “n/a” and the version is “unspecified”.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
Reolink RLC-410W IP cameras contain an authenticated OS command injection vulnerability in the device network settings functionality.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2021-40407 to its Known Exploited Vulnerabilities (KEV) catalog on 18 Dec 2024.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 8 Jan 2025.
- The CVE record was published on 28 Jan 2022, 1,055 days before it was added to KEV.
- The CVE record carries a CVSS v3.0 base score of 9.1 (Critical), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 47.6% (percentile 98.8), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
Description
An OS command injection vulnerability exists in the device network settings functionality of reolink RLC-410W v3.0.0.136_20121102. At [1] or [2], based on DDNS type, the ddns->domain variable, that has the value of the domain parameter provided through the SetDdns API, is not validated properly. This would lead to an OS command injection. An attacker can send an HTTP request to trigger this vulnerability.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Weakness
- CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| 28 Jan 2022 | CVE record published |
| 18 Dec 2024 | Added to CISA KEV |
| 8 Jan 2025 | CISA due date for the required action |
| 21 Oct 2025 | CVE record last updated |
References
More exploited Reolink vulnerabilities
- CVE-2019-11001: Reolink Multiple IP Cameras OS Command Injection Vulnerability