Read the docs
TI-2021-20280 Aliases CVE-2021-44827GHSA-m37g-hc3h-jpg8

There is remote authenticated OS command injection on TP-Link Archer C20i 0.9.1 3.2…

Priority HIGH 70CWE-78Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-78.

Summary

There is remote authenticated OS command injection on TP-Link Archer C20i 0.9.1 3.2 v003a.0 Build 170221 Rel.55462n devices vie the X_TP_ExternalIPv6Address HTTP parameter, allowing a remote attacker to run arbitrary commands on the router with root privileges.

Why it matters now

EPSS 0.53956 99th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:tp-link:archer_c20i_firmware:*:*:*:*:*:*:*:*up to 170221VulnerableTP-Link
cpe:2.3:h:tp-link:archer_c20i:-:*:*:*:*:*:*:*not specified by NVDRunning onTP-Link
  • cpe:2.3:o:tp-link:archer_c20i_firmware:*:*:*:*:*:*:*:* Versions up to 170221 Vulnerable ·TP-Link
  • cpe:2.3:h:tp-link:archer_c20i:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·TP-Link

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-44827
  2. 2026-10-03 Alias added: GHSA-m37g-hc3h-jpg8
  3. 2026-10-21 EPSS moved to the 99th percentile and above
  4. 2026-10-25 EPSS moved to the 95th–99th percentile
  5. 2026-10-30 EPSS moved to the 99th percentile and above

References

Exploit 2

Advisory 1

Sources

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