ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2021-4461

seeyon zhiyuan_oa_web_application_system Missing Authentication for Critical Function

Published Oct 30, 2025 · catalog updated Oct 30, 2025 · seeyon zhiyuan_oa_web_application_system Missing Authentication

Patch now

CVE-2021-4461 is in the CISA known-exploited catalog. Confirm seeyon zhiyuan_oa_web_application_system Missing Authentication against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (seeyon zhiyuan_oa_web_application_system Missing Authentication).
Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
0.49%
Remediation
Remediation guidance
Affected products
stated zhiyuan_oa_web_application_system · vendor seeyon zhiyuan_oa_web_application_system

Seeyon Zhiyuan OA Web Application System versions up to and including 7.0 SP1 improperly decode and parse the parameter in thirdpartyController.do. The decoded map values can influence session attributes without sufficient authentication/authorization checks, enabling attackers to assign a session to arbitrary user IDs. VulnCheck has observed this vulnerability being exploited in the wild as of 2025-10-30 at 00:30:40.855917 UTC. VulnCheck canary evidence.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated zhiyuan_oa_web_application_system<= 7.0
  • vendor seeyon zhiyuan_oa_web_application_systemversion unspecified

How to fix CVE-2021-4461

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-4461 is in the CISA known-exploited catalog. Confirm seeyon zhiyuan_oa_web_application_system Missing Authentication against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with <= 7.0. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 0.49%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 30, 2025 · VulnCheck KEV

    Detected

    Seeyon Zhiyuan OA Web Application System versions up to and including 7.0 SP1 improperly decode and parse the parameter in thirdpartyController.do. The decoded map values can influence session attributes without sufficient authentication/authorization checks, enabling attackers to assign a session to arbitrary user IDs. VulnCheck has observed this vulnerability being exploited in the wild as of 20

  2. Oct 30, 2025 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2021-4461

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-4461

    30-day exploitation probability 0.5%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2021-4461

    Seeyon Zhiyuan OA Web Application System versions up to and including 7.0 SP1 improperly decode and parse the parameter in thirdpartyController.do. The decoded map values can influence session attributes without sufficient authentication/authorization checks, enabling attackers t

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.