How severe is CVE-2020-9028?

CVE-2020-9028 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-2020-9028 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-9028?

CVE-2020-9028 primarily affects Microchip Syncserver S100 Firmware. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-9028?

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

When was CVE-2020-9028 published?

CVE-2020-9028 was published on 2020-02-17 and last updated on 2026-06-17.

CVE-2020-9028

CVE-2020-9028 is a medium-severity vulnerability in Microchip Syncserver S100 Firmware with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Microchip Syncserver S100 Firmware
Published: 2020-02-17
Last modified: 2026-06-17

Description

Symmetricom SyncServer S100 2.90.70.3, S200 1.30, S250 1.25, S300 2.65.0, and S350 2.80.1 devices allow stored XSS via the newUserName parameter on the "User Creation, Deletion and Password Maintenance" screen (when creating a new user).

Frequently asked questions

What is CVE-2020-9028?: Symmetricom SyncServer S100 2.90.70.3, S200 1.30, S250 1.25, S300 2.65.0, and S350 2.80.1 devices allow stored XSS via the newUserName parameter on the "User Creation, Deletion and Password Maintenance" screen (when creating a new user).
How severe is CVE-2020-9028?: CVE-2020-9028 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-2020-9028 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-9028?: CVE-2020-9028 primarily affects Microchip Syncserver S100 Firmware. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-9028?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-9028 published?: CVE-2020-9028 was published on 2020-02-17 and last updated on 2026-06-17.

References

https://sku11army.blogspot.com/2020/01/symmetricom-syncserver_95.html

Affected products (5)

cpe:2.3:o:microchip:syncserver_s100_firmware:2.90.70.3:*:*:*:*:*:*:*
cpe:2.3:o:microchip:syncserver_s200_firmware:1.30:*:*:*:*:*:*:*
cpe:2.3:o:microchip:syncserver_s250_firmware:1.25:*:*:*:*:*:*:*
cpe:2.3:o:microchip:syncserver_s300_firmware:2.65.0:*:*:*:*:*:*:*
cpe:2.3:o:microchip:syncserver_s350_firmware:2.80.1:*:*:*:*:*:*:*

More vulnerabilities in Microchip Syncserver S100 Firmware

CVE-2020-9034 — High (CVSS 7.5): Symmetricom SyncServer S100 2.90.70.3, S200 1.30, S250 1.25, S300 2.65.0, and S350 2.80.1 devices mishandle session…
CVE-2020-9033 — Medium (CVSS 6.5): Symmetricom SyncServer S100 2.90.70.3, S200 1.30, S250 1.25, S300 2.65.0, and S350 2.80.1 devices allow Directory…
CVE-2020-9032 — Medium (CVSS 6.5): Symmetricom SyncServer S100 2.90.70.3, S200 1.30, S250 1.25, S300 2.65.0, and S350 2.80.1 devices allow Directory…
CVE-2020-9031 — Medium (CVSS 6.5): Symmetricom SyncServer S100 2.90.70.3, S200 1.30, S250 1.25, S300 2.65.0, and S350 2.80.1 devices allow Directory…
CVE-2020-9030 — Medium (CVSS 6.5): Symmetricom SyncServer S100 2.90.70.3, S200 1.30, S250 1.25, S300 2.65.0, and S350 2.80.1 devices allow Directory…
CVE-2020-9029 — Medium (CVSS 6.5): Symmetricom SyncServer S100 2.90.70.3, S200 1.30, S250 1.25, S300 2.65.0, and S350 2.80.1 devices allow Directory…

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