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ExploitedIn CISA KEV

CVE-2021-40407

Exploitation confirmed. First attested on 2024-12-18 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2022-01-28
  • WeaknessCWE-78

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2022-01-2820:15CVE publishedNVD
  2. 2024-12-18Added to the CISA KEV catalogCISA KEV
  3. 2024-12-18Listed as exploited by GCVEGCVE
  4. 2024-12-18Exploitation first reportedCISA KEV
  5. 2024-12-2104:56SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-40407?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-40407?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Reolink rlc-410w firmwareversion to verify
BranchAffectedFixed in
3.0= 3.0.0.136_20121102no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. CISA’s required action: 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.due 2025-01-08

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2024-12-18
Patch Due Date
2025-01-08
Ransomware Use
Unknown
Required Action
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.

Sources

  • CISA KEVKEV entry2024-12-18
  • ENISA EUVDexploitation2024-12-182024-12-18
  • GCVEexploitation2024-12-18
  • CISA-ADPSSVC decisionactive2024-12-21
  • OpenCVESSVC decisionactive—
  • NVDCVSS 3.17.2read 2026-10-23
  • CNACVSS 3.09.1known since 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • CNAweakness (CWE)CWE-78known since 2026-10-23
  • NVDweakness (CWE)CWE-78read 2026-10-23
  • FIRST EPSSEPSS score47.6 %read 2026-11-02
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Published
2022-01-28
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-3w42-xvwv-qc2q

Frequently asked questions

What is CVE-2021-40407?

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.

Is CVE-2021-40407 actively exploited?

Yes. CVE-2021-40407 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2025-01-08.

What is the CVSS score for CVE-2021-40407?

CVE-2021-40407 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

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