unidocs ezPDFReader arbitrary command execution vulnerability

published 2021-08-05 5y ago modified 2026-06-17 4mo ago also EUVD-2021-13399

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits: 0; none known

An improper input validation vulnerability in the service of ezPDFReader allows attacker to execute arbitrary command. This issue occurred when the ezPDF launcher received and executed crafted input values through JSON-RPC communication.

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Exploit prediction

1.05% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

unidocs ezPDFReader

Classification

Weakness

CWE-20 Improper Input Validation

References

boho.or.kr /krcert/secNoticeView.do?bulletin_writing_sequence=36168
third-party-advisory

Sources

CVE List CVE-2021-26605
NVD CVE-2021-26605

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