CVE-2021-20151

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 1.6%, top 27% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
10.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 10.0Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Trendnet AC2600 TEW-827DRU version 2.08B01 contains a flaw in the session management for the device. The router's management software manages web sessions based on IP address rather than verifying client cookies/session tokens/etc. This allows an attacker (whether from a different computer, different web browser on the same machine, etc.) to take over an existing session. This does require the attacker to be able to spoof or take over original IP address of the original user's session.

CVSS v3
10.0
EG Score
10.0(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity100% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
73.2%
KEV
Not listed

Published

December 30, 2021

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Jul 18, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Trendnet AC2600 TEW-827DRU Multiple Vulnerabilities - Research Advisory | Tenable®

https://www.tenable.com/security/research/tra-2021-54

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 01:56 UTCEG score recompute
  2. 2026-07-22 22:43 UTCEG score recompute
  3. 2026-07-22 14:05 UTCEPSS rescore
  4. 2026-07-21 15:22 UTCEPSS rescore
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  1. 2026-07-06 02:21 UTCEPSS rescore
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  27. 2026-06-18 17:51 UTCEPSS rescore
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  69. 2026-05-26 05:31 UTCEG score recompute
  70. 2026-05-26 05:31 UTCGHSA enrichment
  71. 2026-05-24 16:49 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-20151?
CVE-2021-20151 is a critical vulnerability published on December 30, 2021. Trendnet AC2600 TEW-827DRU version 2.08B01 contains a flaw in the session management for the device. The router's management software manages web sessions based on IP address rather than verifying client cookies/session tokens/etc. This allows an attacker (whether from a different computer,…
When was CVE-2021-20151 disclosed?
CVE-2021-20151 was first published in the National Vulnerability Database on December 30, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-20151 actively exploited?
CVE-2021-20151 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 73.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-20151?
CVE-2021-20151 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2021-20151?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-20151, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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