Is CVE-2021-4461 actively exploited?

Yes. CVE-2021-4461 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-4461 be exploited remotely?

The attack vector of CVE-2021-4461 has not been classified yet.

What is the CVSS score of CVE-2021-4461?

CVE-2021-4461 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-4461

UNKNOWNCISA KEVIN THE WILD

CVE-2021-4461

Published: April 11, 2026

EPSS:0.10%probability of exploitation in 30 daysPercentile:28.1th

Official Description

Seeyon Zhiyuan OA Web Application System versions up to and including 7.0 SP1 improperly decode and parse the `enc` 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.

NVD Source

Technical Analysis

CVE-2021-4461 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-4461 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.