How severe is CVE-2021-33317?

CVE-2021-33317 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-33317 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33317?

CVE-2021-33317 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-2021-33317?

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

When was CVE-2021-33317 published?

CVE-2021-33317 was published on 2022-05-11 and last updated on 2026-06-17.

CVE-2021-33317

CVE-2021-33317 is a high-severity vulnerability in Trendnet Ti-pg1284i Firmware with a CVSS 3.x base score of 7.5. 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-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
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 a null pointer dereference vulnerability. This vulnerability exists in its lldp related component. Due to fail to check if ChassisID TLV is contained in the packet, by sending a crafted lldp packet to the device, an attacker can crash the process due to null pointer dereference.

Frequently asked questions

What is CVE-2021-33317?: The TRENDnet TI-PG1284i switch(hw v2.0R) prior to version 2.0.2.S0 suffers from a null pointer dereference vulnerability. This vulnerability exists in its lldp related component. Due to fail to check if ChassisID TLV is contained in the packet, by sending a crafted lldp packet to the device, an attacker can crash the process due to null pointer dereference.
How severe is CVE-2021-33317?: CVE-2021-33317 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-33317 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33317?: CVE-2021-33317 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-2021-33317?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-33317 published?: CVE-2021-33317 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-2021-33316 — 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-2021-33315 — 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.…

All CVEs affecting Trendnet Ti-pg1284i Firmware →

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