Is CVE-2021-4304 actively exploited?

No active exploitation of CVE-2021-4304 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-4304 be exploited remotely?

Yes. CVE-2021-4304 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-4304?

CVE-2021-4304 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2021-4304

CWE-77Published: January 5, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

A vulnerability was found in eprintsug ulcc-core. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the file cgi/toolbox/toolbox. The manipulation of the argument password leads to command injection. The attack can be launched remotely. The patch is named 811edaae81eb044891594f00062a828f51b22cb1. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-217447.

NVD Source

Risk Analysis

The eprintsug ulcc-core component contains a command injection vulnerability triggered by manipulating the password argument. This critical flaw allows for remote code execution, warranting immediate attention.

No public exploit is currently known, and the vulnerability is not in the CISA KEV. The flaw is remotely exploitable with low complexity.

Recommended Action

Apply the vendor-provided patch identified by hash 811edaae81eb044891594f00062a828f51b22cb1.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-4304 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.