CVE-2021-33316

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-12. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

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

The TRENDnet TI-PG1284i switch(hw v2.0R) prior to version 2.0.2.S0 suffers from an integer underflow vulnerability. This vulnerability exists in its lldp related component. Due to lack of proper validation on length field of ChassisID TLV, by sending a crafted lldp packet to the device, integer underflow would occur and the negative number will be passed to memcpy() later, which may cause buffer overflow or invalid memory access.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
58.9%
KEV
Not listed

Published

May 11, 2022

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Jun 12, 2026
No patch confirmed yet.
generic

Warranty Policy | TRENDnet

https://www.trendnet.com/support/view.asp?cat=4&id=81

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 43× 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. 2026-07-21 15:22 UTCEPSS rescore
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  3. 2026-07-20 17:05 UTCEPSS rescore
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  1. 2026-07-04 06:29 UTCEPSS rescore
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  22. 2026-06-19 19:24 UTCEPSS rescore
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  68. 2026-05-26 07:17 UTCEPSS rescore
  69. 2026-05-25 22:23 UTCEG score recompute
  70. 2026-05-25 22:23 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2021-33316?
CVE-2021-33316 is a critical vulnerability published on May 11, 2022. The TRENDnet TI-PG1284i switch(hw v2.0R) prior to version 2.0.2.S0 suffers from an integer underflow vulnerability. This vulnerability exists in its lldp related component. Due to lack of proper validation on length field of ChassisID TLV, by sending a crafted lldp packet to the device, integer…
When was CVE-2021-33316 disclosed?
CVE-2021-33316 was first published in the National Vulnerability Database on May 11, 2022, 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-2021-33316 actively exploited?
CVE-2021-33316 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 58.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-33316?
CVE-2021-33316 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-33316?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-33316, 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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