How severe is CVE-2020-28351?

CVE-2020-28351 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-28351 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 16% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-28351?

CVE-2020-28351 affects Mitel Shoretel Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-28351?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-28351 published?

CVE-2020-28351 was published on 2020-11-09 and last updated on 2026-06-17.

CVE-2020-28351

CVE-2020-28351 is a medium-severity vulnerability in Mitel Shoretel Firmware with a CVSS 3.x base score of 6.1. Its EPSS exploit-prediction score of 16% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 16% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Mitel Shoretel Firmware
Published: 2020-11-09
Last modified: 2026-06-17

Description

The conferencing component on Mitel ShoreTel 19.46.1802.0 devices could allow an unauthenticated attacker to conduct a reflected cross-site scripting (XSS) attack (via the PATH_INFO to index.php) due to insufficient validation for the time_zone object in the HOME_MEETING& page.

Frequently asked questions

What is CVE-2020-28351?: The conferencing component on Mitel ShoreTel 19.46.1802.0 devices could allow an unauthenticated attacker to conduct a reflected cross-site scripting (XSS) attack (via the PATH_INFO to index.php) due to insufficient validation for the time_zone object in the HOME_MEETING& page.
How severe is CVE-2020-28351?: CVE-2020-28351 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-28351 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 16% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-28351?: CVE-2020-28351 affects Mitel Shoretel Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-28351?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-28351 published?: CVE-2020-28351 was published on 2020-11-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:mitel:shoretel_firmware:19.46.1802.0:*:*:*:*:*:*:*

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