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CVE-2021-20155

32
FAUCET Score

CVE-2021-20155 describes a critical vulnerability in Trendnet AC2600 TEW-827DRU version 2.08B01, involving hardcoded credentials used to encrypt device configuration backups. This allows an unauthenticated attacker to remotely access, modify, and restore device configurations, leading to full compromise. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network with low attack complexity, posing a high risk to confidentiality, integrity, and availability. While no public exploit code is officially available, the vulnerability has garnered significant community discussion, indicating potential interest in developing exploits, though it is not currently listed as actively exploited.

Impacted Technologies

VendorProductVersion(s)CPE
2.08b01CPE matchmatch criteria
cpe:2.3:o:trendnet:tew-827dru_firmware:2.08b01:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.90%
Probability of exploitation in next 30 days
EPSS Percentile
77.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0190 is in the 66th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (3)

giteavendor investigatingvia llm_extracted
opensshvendor investigatingvia llm_extracted
railsvendor investigatingvia llm_extracted

Vendor Advisories (3)

opensshllm-openssh-45a77a1aa1e5a984CRITICAL

Trendnet AC2600 TEW-827DRU Multiple Vulnerabilities

Dec 30, 2021
giteallm-gitea-3b028f48a893fc43CRITICAL

Trendnet AC2600 TEW-827DRU Multiple Vulnerabilities

Dec 30, 2021
railsllm-rails-32c592b9c1e5a4e5CRITICAL

Trendnet AC2600 TEW-827DRU Multiple Vulnerabilities

Dec 30, 2021

References

tenable.com / security/research/tra-2021-54
ExploitThird Party Advisory