What is CVE-2020-35598?

CVE-2020-35598 is a high-severity vulnerability in Advanced Comment System Project, classified under Path Traversal. CVSS score: 7.5/10. Published 2020-12-23.

How severe is CVE-2020-35598?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2020-35598 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Path Traversal in Advanced Comment System Project

CVE-2020-35598

ACS Advanced Comment System 1.0 is affected by Directory Traversal via an advanced_component_system/index.php?ACS_path=..%2f URI. NOTE: this might be the same as CVE-2009-4623

Vulnerability class: Path Traversal (Directory Traversal)

Published 2020-12-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.208 (97.5th percentile), scored 2026-10-02.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.210 · newest: 0.208 · change: -0.002

Affected products

Advanced Comment System Project — versions 1.0

Weakness classification (CWE)

CWE-22 — Path Traversal

Public proof-of-concept exploits

References

seclists.org/fulldisclosure/2020/Dec/13 (Exploit, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2020-35598?: CVE-2020-35598 is a high-severity vulnerability in Advanced Comment System Project, classified under Path Traversal. CVSS score: 7.5/10. Published 2020-12-23.
How severe is CVE-2020-35598?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2020-35598 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.