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TI-2021-03456 Aliases CVE-2021-20156GHSA-6w2f-q3rq-jh8v

Improper signature verification in Trendnet AC2600 TEW-827DRU

Priority LOW 29CWE-347Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-347.

Summary

Trendnet AC2600 TEW-827DRU version 2.08B01 contains an improper access control configuration that could allow for a malicious firmware update. It is possible to manually install firmware that may be malicious in nature as there does not appear to be any signature validation done to determine if it is from a known and trusted source. This includes firmware updates that are done via the automated "check for updates" in the admin interface. If an attacker is able to masquerade as the update server, the device will not verify that the firmware updates downloaded are legitimate.

Why it matters now

EPSS 0.00419 36th percentileScored 2026-11-07
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
—Trendnet AC2600 TEW-827DRU2.08B01—No fix listedCNA
  • Trendnet AC2600 TEW-827DRU Vendor— Affected 2.08B01 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:trendnet:tew-827dru_firmware:2.08b01:*:*:*:*:*:*:*2.08b01VulnerableTRENDnet
cpe:2.3:h:trendnet:tew-827dru:2.0:*:*:*:*:*:*:*2.0Running onTRENDnet
  • cpe:2.3:o:trendnet:tew-827dru_firmware:2.08b01:*:*:*:*:*:*:* Versions 2.08b01 Vulnerable ·TRENDnet
  • cpe:2.3:h:trendnet:tew-827dru:2.0:*:*:*:*:*:*:* Versions 2.0 Running on ·TRENDnet

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-20156
  2. 2026-10-03 Alias added: GHSA-6w2f-q3rq-jh8v

References

Advisory 1

  • TI-2024-18847 There is a command injection vulnerability in the TRENDnet TEW-827DRU router with… CVSS 3.1CRITICAL 10.0
  • TI-2024-18846 There is a command injection vulnerability in the TRENDnet TEW-827DRU router with… CVSS 3.1HIGH 8.8
  • TI-2024-24383 TRENDnet TEW-827DRU devices through 2.06B04 contain a stack-based buffer overflow in the… CVSS 3.1HIGH 8.1
  • TI-2021-03458 Missing authentication in Trendnet AC2600 TEW-827DRU CVSS 3.1CRITICAL 9.8
  • TI-2019-09962 TRENDnet TEW-827DRU with firmware up to and including 2.04B03 contains multiple command… CVSS 3.0CRITICAL 9.8
  • TI-2021-03450 Missing authentication in Trendnet AC2600 TEW-827DRU CVSS 3.1MEDIUM 5.3
See all 41 →

Sources

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