How severe is CVE-2021-33316?

CVE-2021-33316 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-33316 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33316?

CVE-2021-33316 primarily affects Trendnet Ti-pg1284i Firmware. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-33316?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-33316 published?

CVE-2021-33316 was published on 2022-05-11 and last updated on 2026-06-17.

CVE-2021-33316

CVE-2021-33316 is a critical-severity vulnerability in Trendnet Ti-pg1284i Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Trendnet Ti-pg1284i Firmware
Published: 2022-05-11
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-33316?: 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.
How severe is CVE-2021-33316?: CVE-2021-33316 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-33316 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33316?: CVE-2021-33316 primarily affects Trendnet Ti-pg1284i Firmware. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-33316?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-33316 published?: CVE-2021-33316 was published on 2022-05-11 and last updated on 2026-06-17.

References

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

Affected products (9)

cpe:2.3:o:trendnet:ti-pg1284i_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:trendnet:ti-g102i_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:trendnet:ti-g160i_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:trendnet:ti-g642i_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:trendnet:ti-pg102i_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:trendnet:ti-pg541i_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:trendnet:ti-rp262i_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:trendnet:teg-30102ws_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:trendnet:tpe-30102ws_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Trendnet Ti-pg1284i Firmware

CVE-2021-33315 — Critical (CVSS 9.8): The TRENDnet TI-PG1284i switch(hw v2.0R) prior to version 2.0.2.S0 suffers from an integer underflow vulnerability.…
CVE-2021-33317 — High (CVSS 7.5): The TRENDnet TI-PG1284i switch(hw v2.0R) prior to version 2.0.2.S0 suffers from a null pointer dereference…

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