How severe is CVE-2020-9034?

CVE-2020-9034 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 high, and availability none.

Is CVE-2020-9034 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-9034?

CVE-2020-9034 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-2020-9034?

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-2020-9034 published?

CVE-2020-9034 was published on 2020-02-17 and last updated on 2026-06-17.

CVE-2020-9034

CVE-2020-9034 is a high-severity vulnerability in Microchip Syncserver S100 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.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
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 mishandle session validation, leading to unauthenticated creation, modification, or elimination of users.

Frequently asked questions

What is CVE-2020-9034?: 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 validation, leading to unauthenticated creation, modification, or elimination of users.
How severe is CVE-2020-9034?: CVE-2020-9034 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 high, and availability none.
Is CVE-2020-9034 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-9034?: CVE-2020-9034 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-2020-9034?: 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-2020-9034 published?: CVE-2020-9034 was published on 2020-02-17 and last updated on 2026-06-17.

References

https://sku11army.blogspot.com/2020/01/symmetricom-syncserver_27.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-2020-9033 — 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…
CVE-2020-9028 — Medium (CVSS 6.1): 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…

All CVEs affecting Microchip Syncserver S100 Firmware →