TI-2021-17486 Aliases CVE-2021-40423 GHSA-4grj-8qw5-j9f8

A denial of service vulnerability exists in the cgiserver.cgi API command parser…

HIGH 72CWE-20Published 2022-01-28 · Updated 2025-04-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

A denial of service vulnerability exists in the cgiserver.cgi API command parser functionality of Reolink RLC-410W v3.0.0.136_20121102. A specially-crafted series of HTTP requests can lead to denial of service. An attacker can send an HTTP request to trigger this vulnerability.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.01339 71st percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:reolink:rlc-410w_firmware:3.0.0.136_20121102:::::::*	3.0.0.136_20121102	Vulnerable	Reolink
cpe:2.3:h:reolink:rlc-410w:-:::::::*	not specified by NVD	Running on	Reolink

cpe:2.3:o:reolink:rlc-410w_firmware:3.0.0.136_20121102:*:*:*:*:*:*:* Versions 3.0.0.136_20121102 Vulnerable ·Reolink
cpe:2.3:h:reolink:rlc-410w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Reolink

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-40423
2026-10-03 Alias added: GHSA-4grj-8qw5-j9f8

References

Exploit 1

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1432

Advisory 1

https://talosintelligence.com/vulnerability_reports/TALOS-2022-1432

TI-2021-17471 An OS command injection vulnerability exists in the device network settings functionality… KEVCVSS 3.1HIGH 7.2
TI-2019-08219 On Reolink RLC-410W, C1 Pro, C2 Pro, RLC-422W, and RLC-511W devices through 1.0.227, an… KEVCVSS 3.1HIGH 7.2
TI-2021-17473 An OS command injection vulnerability exists in the device network settings functionality… CVSS 3.1CRITICAL 9.8
TI-2021-17472 An OS command injection vulnerability exists in the device network settings functionality… CVSS 3.1CRITICAL 9.8
TI-2021-17483 A firmware update vulnerability exists in the 'factory' binary of reolink RLC-410W… CVSS 3.1HIGH 7.5
TI-2021-20034 A denial of service vulnerability exists in the cgiserver.cgi JSON command parser… CVSS 3.1HIGH 7.7

See all 87 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences