CVE-2020-9028

Exp

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).

Published: 2020-02-17 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-9028 is rated Exploit Available (58.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.33%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2020-9028

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2020-9028

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 0.24% 0.33% +0.09%
2 2025-11-18 0.33% 0.24% -0.09%
3 2025-05-10 — 0.33% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-9028

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2020-9028

Affected software / configurations for CVE-2020-9028

Vendor Product Version Raw CPE
microchip syncserver_s100_firmware 2.90.70.3 cpe:2.3:o:microchip:syncserver_s100_firmware:2.90.70.3:*:*:*:*:*:*:*
microchip syncserver_s200_firmware 1.30 cpe:2.3:o:microchip:syncserver_s200_firmware:1.30:*:*:*:*:*:*:*
microchip syncserver_s250_firmware 1.25 cpe:2.3:o:microchip:syncserver_s250_firmware:1.25:*:*:*:*:*:*:*
microchip syncserver_s300_firmware 2.65.0 cpe:2.3:o:microchip:syncserver_s300_firmware:2.65.0:*:*:*:*:*:*:*
microchip syncserver_s350_firmware 2.80.1 cpe:2.3:o:microchip:syncserver_s350_firmware:2.80.1:*:*:*:*:*:*:*

References for CVE-2020-9028

cvelogic Threat Intelligence