What is CVE-2021-33591?

CVE-2021-33591 is a high-severity vulnerability in Naver Comic Viewer, classified under Active Debug Code. CVSS score: 8.8/10. Published 2021-05-28.

How severe is CVE-2021-33591?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Naver Comic Viewer

CVE-2021-33591

An exposed remote debugging port in Naver Comic Viewer prior to 1.0.15.0 allowed a remote attacker to execute arbitrary code via a crafted HTML page.

Published 2021-05-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Naver Comic Viewer
Naver Comic Viewer — versions unspecified

Weakness classification (CWE)

CWE-489 — Active Debug Code

References

cve.naver.com/detail/cve-2021-33591 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-33591?: CVE-2021-33591 is a high-severity vulnerability in Naver Comic Viewer, classified under Active Debug Code. CVSS score: 8.8/10. Published 2021-05-28.
How severe is CVE-2021-33591?: High severity. CVSS v3 base score is 8.8 out of 10.