CVE-2020-9034Public exploitNetwork attack vector

Account manipulation via improper session validation

Published Feb 17, 2020 · Updated Aug 4, 2024

Authentication bypass in Symmetricom SyncServer S100, S200, S250, S300, and S350 allows remote attackers to alter user accounts. The affected firmware fails to enforce session validation before processing account-management requests, so no authenticated session is required. Exposure is limited to the listed appliance versions, and successful exploitation permits account creation, modification, or deletion without reported data disclosure or service interruption.

CVSS severity7.5
High
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Symmetricom SyncServer S100, S200, S250, S300, and S350 allows remote attackers to alter user accounts. The affected firmware fails to enforce session validation before processing account-management requests, so no authenticated session is required. Exposure is limited to the listed appliance versions, and successful exploitation permits account creation, modification, or deletion without reported data disclosure or service interruption.

The record

CVE
CVE-2020-9034
Published
Feb 17, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1098
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 17, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1098Account Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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